This is the documentation for Cloudera Manager 5.1.x. Documentation for other versions is available at Cloudera Documentation.

YARN (MR2 Included) properties in CDH 4.3.0

Role groups:

Gateway Default Group

Advanced

Display Name Description Related Name Default Value API Name Required
MapReduce Client Advanced Configuration Snippet (Safety Valve) for mapred-site.xml For advanced use only, a string to be inserted into the client configuration for mapred-site.xml. mapreduce_client_config_safety_valve false
Gateway Client Environment Advanced Configuration Snippet for hadoop-env.sh (Safety Valve) For advanced use only, key-value pairs (one on each line) to be inserted into the client configuration for hadoop-env.sh. mapreduce_client_env_safety_valve false
Client Java Configuration Options These are Java command line arguments. Commonly, garbage collection flags or extra debugging flags would be passed here. -Djava.net.preferIPv4Stack=true mapreduce_client_java_opts false
YARN Client Advanced Configuration Snippet (Safety Valve) for yarn-site.xml For advanced use only, a string to be inserted into the client configuration for yarn-site.xml. yarn_client_config_safety_valve false

Compression

Display Name Description Related Name Default Value API Name Required
Compression Level of Codecs Compression level for the codec used to compress MapReduce outputs. Default compression is a balance between speed and compression ratio. zlib.compress.level DEFAULT_COMPRESSION zlib_compress_level false

Monitoring

Display Name Description Related Name Default Value API Name Required
Enable Log Event Capture When set, each role will identify important log events and forward them to Cloudera Manager. true catch_events false
Enable Configuration Change Alerts When set, Cloudera Manager will send alerts when this entity's configuration changes. false enable_config_alerts false

Other

Display Name Description Related Name Default Value API Name Required
Alternatives Priority The priority level that the client configuration will have in the Alternatives system on the hosts. Higher priority levels will cause Alternatives to prefer this configuration over any others. 91 client_config_priority true
Running Job History Location Location to store the job history files of running jobs. This is a path on the host where the JobTracker is running. hadoop.job.history.location /var/log/hadoop-mapreduce/history hadoop_job_history_dir false
SequenceFile I/O Buffer Size Size of buffer for read and write operations of SequenceFiles. io.file.buffer.size 64 KiB io_file_buffer_size false
I/O Sort Factor The number of streams to merge at the same time while sorting files. That is, the number of sort heads to use during the merge sort on the reducer side. This determines the number of open file handles. Merging more files in parallel reduces merge sort iterations and improves run time by eliminating disk I/O. Note that merging more files in parallel uses more memory. If 'io.sort.factor' is set too high or the maximum JVM heap is set too low, excessive garbage collection will occur. The Hadoop default is 10, but Cloudera recommends a higher value. Will be part of generated client configuration. mapreduce.task.io.sort.factor 64 io_sort_factor false
I/O Sort Memory Buffer (MiB) The total amount of memory buffer, in megabytes, to use while sorting files. Note that this memory comes out of the user JVM heap size (meaning total user JVM heap - this amount of memory = total user usable heap space. Note that Cloudera's default differs from Hadoop's default; Cloudera uses a bigger buffer by default because modern machines often have more RAM. The smallest value across all TaskTrackers will be part of generated client configuration. mapreduce.task.io.sort.mb 256 MiB io_sort_mb false
I/O Sort Spill Percent The soft limit in either the buffer or record collection buffers. When this limit is reached, a thread will begin to spill the contents to disk in the background. Note that this does not imply any chunking of data to the spill. A value less than 0.5 is not recommended. The syntax is in decimal units; the default is 80% and is formatted 0.8. Will be part of generated client configuration. mapreduce.map.sort.spill.percent 0.8 io_sort_spill_percent false
Use Compression on Map Outputs If enabled, uses compression on the map outputs before they are sent across the network. Will be part of generated client configuration. mapreduce.map.output.compress true mapred_compress_map_output false
Compression Codec of MapReduce Map Output For MapReduce map outputs that are compressed, specify the compression codec to use. Will be part of generated client configuration. mapreduce.map.output.compress.codec org.apache.hadoop.io.compress.SnappyCodec mapred_map_output_compression_codec false
Map Tasks Speculative Execution If enabled, multiple instances of some map tasks may be executed in parallel. mapreduce.map.speculative false mapred_map_tasks_speculative_execution false
Compress MapReduce Job Output Compress the output of MapReduce jobs. Will be part of generated client configuration. mapreduce.output.fileoutputformat.compress false mapred_output_compress false
Compression Codec of MapReduce Job Output For MapReduce job outputs that are compressed, specify the compression codec to use. Will be part of generated client configuration. mapreduce.output.fileoutputformat.compress.codec org.apache.hadoop.io.compress.DefaultCodec mapred_output_compression_codec false
Compression Type of MapReduce Job Output For MapReduce job outputs that are compressed as SequenceFiles, you can select one of these compression type options: NONE, RECORD or BLOCK. Cloudera recommends BLOCK. Will be part of generated client configuration. mapreduce.output.fileoutputformat.compress.type BLOCK mapred_output_compression_type false
Default Number of Parallel Transfers During Shuffle The default number of parallel transfers run by reduce during the copy (shuffle) phase. This number should be between sqrt(nodes*number_of_map_slots_per_node) and nodes*number_of_map_slots_per_node/2. Will be part of generated client configuration. mapreduce.reduce.shuffle.parallelcopies 10 mapred_reduce_parallel_copies false
Number of Map Tasks to Complete Before Reduce Tasks Fraction of the number of map tasks in the job which should be completed before reduce tasks are scheduled for the job. mapreduce.job.reduce.slowstart.completedmaps 0.8 mapred_reduce_slowstart_completed_maps false
Default Number of Reduce Tasks per Job The default number of reduce tasks per job. Will be part of generated client configuration. mapreduce.job.reduces 1 mapred_reduce_tasks false
Reduce Tasks Speculative Execution If enabled, multiple instances of some reduce tasks may be executed in parallel. mapreduce.reduce.speculative false mapred_reduce_tasks_speculative_execution false
Mapreduce Submit Replication The replication level for submitted job files. mapreduce.client.submit.file.replication 10 mapred_submit_replication false
Mapreduce Task Timeout The number of milliseconds before a task will be terminated if it neither reads an input, writes an output, nor updates its status string. mapreduce.task.timeout 10 minute(s) mapred_task_timeout false
Shared Temp Directories A shared directory for temporary files. mapreduce.cluster.temp.dir mapreduce_cluster_temp_dir false
Application Framework The application framework to run jobs with. If not set, jobs will be run with the local job runner. mapreduce.framework.name yarn mapreduce_framework_name false
JobTracker MetaInfo Maxsize The maximum permissible size of the split metainfo file. The JobTracker won't attempt to read split metainfo files bigger than the configured value. No limits if set to -1. mapreduce.job.split.metainfo.maxsize 10000000 mapreduce_jobtracker_split_metainfo_maxsize false
Map Task Java Opts Base Java opts for the map processes. The following symbol, if present, will be interpolated: @taskid@ is replaced by current TaskID. Any other occurrences of '@' will go unchanged. For example, to enable verbose gc logging to a file named for the taskid in /tmp pass a value of: "-verbose:gc -Xloggc:/tmp/@taskid@.gc". The configuration variable 'Map Task Memory' can be used to control the maximum memory of the map processes. mapreduce.map.java.opts -Djava.net.preferIPv4Stack=true mapreduce_map_java_opts false
Reduce Task Java Opts Base Java opts for the reduce processes. The following symbol, if present, will be interpolated: @taskid@ is replaced by current TaskID. Any other occurrences of '@' will go unchanged. For example, to enable verbose gc logging to a file named for the taskid in /tmp pass a value of: "-verbose:gc -Xloggc:/tmp/@taskid@.gc". The configuration variable 'Reduce Task Memory' can be used to control the maximum memory of the reduce processes. mapreduce.reduce.java.opts -Djava.net.preferIPv4Stack=true mapreduce_reduce_java_opts false
Max Shuffle Connections Maximum allowed connections for the shuffle. Set to 0 (zero) to indicate no limit on the number of connections. mapreduce.shuffle.max.connections 80 mapreduce_shuffle_max_connections false
ApplicationMaster Java Opts Base Java command line arguments passed to the MapReduce ApplicationMaster. yarn.app.mapreduce.am.command-opts -Djava.net.preferIPv4Stack=true yarn_app_mapreduce_am_command_opts false

Performance

Display Name Description Related Name Default Value API Name Required
Job Counters Limit Limit on the number of counters allowed per job. mapreduce.job.counters.max 120 mapreduce_job_counters_limit false
Enable Ubertask Optimization Whether to enable ubertask optimization, which runs "sufficiently small" jobs sequentially within a single JVM. "Small" is defined by the mapreduce.job.ubertask.maxmaps, mapreduce.job.ubertask.maxreduces, and mapreduce.job.ubertask.maxbytes settings. mapreduce.job.ubertask.enable false mapreduce_job_ubertask_enabled false
Ubertask Maximum Job Size Threshold for number of input bytes, beyond which a job is considered too big for ubertask optimization. If no value is specified, dfs.block.size is used as a default. mapreduce.job.ubertask.maxbytes mapreduce_job_ubertask_maxbytes false
Ubertask Maximum Maps Threshold for number of maps, beyond which a job is considered too big for ubertask optimization. mapreduce.job.ubertask.maxmaps 9 mapreduce_job_ubertask_maxmaps false
Ubertask Maximum Reduces Threshold for number of reduces, beyond which a job is considered too big for ubertask optimization. Note: As of CDH 5, MR2 does not support more than one reduce in an ubertask. (Zero is valid.) mapreduce.job.ubertask.maxreduces 1 mapreduce_job_ubertask_maxreduces false

Resource Management

Display Name Description Related Name Default Value API Name Required
Client Java Heap Size in Bytes Maximum size in bytes for the Java process heap memory. Passed to Java -Xmx. 825955249 B mapreduce_client_java_heapsize false
Map Task CPU Virtual Cores The number of virtual CPU cores allocated for each map task of a job. This parameter has no effect prior to CDH 4.4. mapreduce.map.cpu.vcores 1 mapreduce_map_cpu_vcores false
Map Task Maximum Heap Size The maximum Java heap size, in bytes, of the map processes. This number will be formatted and concatenated with 'Map Task Java Opts Base' to pass to Hadoop. mapreduce.map.java.opts.max.heap 825955249 B mapreduce_map_java_opts_max_heap false
Map Task Memory The amount of physical memory, in MiB, allocated for each map task of a job. mapreduce.map.memory.mb 1 GiB mapreduce_map_memory_mb false
Reduce Task CPU Virtual Cores The number of virtual CPU cores for each reduce task of a job. mapreduce.reduce.cpu.vcores 1 mapreduce_reduce_cpu_vcores false
Reduce Task Maximum Heap Size The maximum Java heap size, in bytes, of the reduce processes. This number will be formatted and concatenated with 'Reduce Task Java Opts Base' to pass to Hadoop. mapreduce.reduce.java.opts.max.heap 825955249 B mapreduce_reduce_java_opts_max_heap false
Reduce Task Memory The amount of physical memory, in MiB, allocated for each reduce task of a job. This parameter has no effect prior to CDH 4.4. mapreduce.reduce.memory.mb 1 GiB mapreduce_reduce_memory_mb false
ApplicationMaster Java Maximum Heap Size The maximum heap size, in bytes, of the Java MapReduce ApplicationMaster. This number will be formatted and concatenated with 'ApplicationMaster Java Opts Base' to pass to Hadoop. 825955249 B yarn_app_mapreduce_am_max_heap false
ApplicationMaster Virtual CPU Cores The virtual CPU cores requirement, for the ApplicationMaster. This parameter has no effect prior to CDH 4.4. yarn.app.mapreduce.am.resource.cpu-vcores 1 yarn_app_mapreduce_am_resource_cpu_vcores false
ApplicationMaster Memory The physical memory requirement, in MiB, for the ApplicationMaster. yarn.app.mapreduce.am.resource.mb 1 GiB yarn_app_mapreduce_am_resource_mb false

JobHistory Server Default Group

Advanced

Display Name Description Related Name Default Value API Name Required
System Group The group that the JobHistory Server process should run as. hadoop history_process_groupname true
System User The user that the JobHistory Server process should run as. mapred history_process_username true
JobHistory Server Advanced Configuration Snippet (Safety Valve) for yarn-site.xml For advanced use only, a string to be inserted into yarn-site.xml for this role only. jobhistory_config_safety_valve false
JobHistory Server Advanced Configuration Snippet (Safety Valve) for mapred-site.xml For advanced use only, a string to be inserted into mapred-site.xml for this role only. jobhistory_mapred_safety_valve false
JobHistory Server Logging Advanced Configuration Snippet (Safety Valve) For advanced use only, a string to be inserted into log4j.properties for this role only. log4j_safety_valve false
Java Configuration Options for JobHistory Server These arguments will be passed as part of the Java command line. Commonly, garbage collection flags or extra debugging flags would be passed here. -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:-CMSConcurrentMTEnabled -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled mr2_jobhistory_java_opts false
Heap Dump Directory Path to directory where heap dumps are generated when java.lang.OutOfMemoryError error is thrown. This directory is automatically created if it doesn't exist. However, if this directory already exists, role user must have write access to this directory. If this directory is shared amongst multiple roles, it should have 1777 permissions. Note that the heap dump files are created with 600 permissions and are owned by the role user. The amount of free space in this directory should be greater than the maximum Java Process heap size configured for this role. /tmp oom_heap_dump_dir false
Dump Heap When Out of Memory When set, generates heap dump file when java.lang.OutOfMemoryError is thrown. false oom_heap_dump_enabled true
Kill When Out of Memory When set, a SIGKILL signal is sent to the role process when java.lang.OutOfMemoryError is thrown. true oom_sigkill_enabled true
Automatically Restart Process When set, this role's process is automatically (and transparently) restarted in the event of an unexpected failure. false process_auto_restart true

Logs

Display Name Description Related Name Default Value API Name Required
JobHistory Server Logging Threshold The minimum log level for JobHistory Server logs INFO log_threshold false
JobHistory Server Maximum Log File Backups The maximum number of rolled log files to keep for JobHistory Server logs. Typically used by log4j. 10 max_log_backup_index false
JobHistory Server Max Log Size The maximum size, in megabytes, per log file for JobHistory Server logs. Typically used by log4j. 200 MiB max_log_size false
JobHistory Server Log Directory Directory where JobHistory Server will place its log files. hadoop.log.dir /var/log/hadoop-mapreduce mr2_jobhistory_log_dir false

Monitoring

Display Name Description Related Name Default Value API Name Required
Enable Health Alerts for this Role When set, Cloudera Manager will send alerts when the health of this role reaches the threshold specified by the EventServer setting eventserver_health_events_alert_threshold true enable_alerts false
Enable Configuration Change Alerts When set, Cloudera Manager will send alerts when this entity's configuration changes. false enable_config_alerts false
File Descriptor Monitoring Thresholds The health test thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit. Warning: 50.0 %, Critical: 70.0 % jobhistory_fd_thresholds false
Garbage Collection Duration Thresholds The health test thresholds for the weighted average time spent in Java garbage collection. Specified as a percentage of elapsed wall clock time. Warning: 30.0, Critical: 60.0 jobhistory_gc_duration_thresholds false
Garbage Collection Duration Monitoring Period The period to review when computing the moving average of garbage collection time. 5 minute(s) jobhistory_gc_duration_window false
JobHistory Server Host Health Test When computing the overall JobHistory Server health, consider the host's health. true jobhistory_host_health_enabled false
JobHistory Server Process Health Test Enables the health test that the JobHistory Server's process state is consistent with the role configuration true jobhistory_scm_health_enabled false
Web Metric Collection Enables the health test that the Cloudera Manager Agent can successfully contact and gather metrics from the web server. true jobhistory_web_metric_collection_enabled false
Web Metric Collection Duration The health test thresholds on the duration of the metrics request to the web server. Warning: 10 second(s), Critical: Never jobhistory_web_metric_collection_thresholds false
Log Directory Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory. Warning: 10 GiB, Critical: 5 GiB log_directory_free_space_absolute_thresholds false
Log Directory Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Log Directory Free Space Monitoring Absolute Thresholds setting is configured. Warning: Never, Critical: Never log_directory_free_space_percentage_thresholds false
Rules to Extract Events from Log Files This file contains the rules which govern how log messages are turned into events by the custom log4j appender that this role loads. It is in JSON format, and is composed of a list of rules. Every log message is evaluated against each of these rules in turn to decide whether or not to send an event for that message.Each rule has some or all of the following fields:
  • alert
    - whether or not events generated from this rule should be promoted to alerts. A value of "true" will cause alerts to be generated. If not specified, the default is "false".
  • rate
    (mandatory) - the maximum number of log messages matching this rule that may be sent as events every minute. If more than rate matching log messages are received in a single minute, the extra messages are ignored. If rate is less than 0, the number of messages per minute is unlimited.
  • periodminutes
    - the number of minutes during which the publisher will only publish rate events or fewer. If not specified, the default is one minute
  • threshold
    - apply this rule only to messages with this log4j severity level or above. An example is "WARN" for warning level messages or higher.
  • content
    - match only those messages whose contents match this regular expression.
  • exceptiontype
    - match only those messages which are part of an exception message. The exception type must match this regular expression.
Example:
{"alert": false, "rate": 10, "exceptiontype": "java.lang.StringIndexOutOfBoundsException"}
This rule will send events to Cloudera Manager for every 
StringIndexOutOfBoundsException
, up to a maximum of 10 every minute.		 version: 0, rules: [ alert: false, rate: 1, periodminutes: 1, threshold:FATAL, alert: false, rate: 0, threshold:WARN, content: .* is deprecated. Instead, use .*, alert: false, rate: 0, threshold:WARN, content: .* is deprecated. Use .* instead, alert: false, rate: 1, periodminutes: 2, exceptiontype: .*, alert: false, rate: 1, periodminutes: 1, threshold:WARN ] log_event_whitelist false
Role Triggers The configured triggers for this role. This is a JSON formatted list of triggers. These triggers are evaluated as part as the health system. Every trigger expression is parsed, and if the trigger condition is met, the list of actions provided in the trigger expression is executed.Each trigger has all of the following fields:
  • triggerName (mandatory) - the name of the trigger. This value must be unique for the specific role.
  • triggerExpression (mandatory) - a tsquery expression representing the trigger.
  • streamThreshold (optional) - the maximum number of streams that can satisfy a condition of a trigger before the condition fires. By default set to 0, and any stream returned will cause the condition to fire.
  • enabled (optional) - by default set to 'true'. If set to 'false' the trigger will not be evaluated.
For example, here is a JSON formatted trigger configured for a DataNode that fires if the DataNode has more than 1500 file-descriptors opened:
[{"triggerName": "sample-trigger",
  "triggerExpression": "IF (SELECT fd_open WHERE roleName=$ROLENAME and last(fd_open) > 1500) DO health:bad",
  "streamThreshold": 0, "enabled": "true"}]
Consult the trigger rules documentation for more details on how to write triggers using tsquery.The JSON format is evolving and may change in the future and as a result backward compatibility is not guaranteed between releases at this time.		 [] role_triggers true
Unexpected Exits Thresholds The health test thresholds for unexpected exits encountered within a recent period specified by the unexpected_exits_window configuration for the role. Warning: Never, Critical: Any unexpected_exits_thresholds false
Unexpected Exits Monitoring Period The period to review when computing unexpected exits. 5 minute(s) unexpected_exits_window false

Other

Display Name Description Related Name Default Value API Name Required
Job History Files Cleaner Interval Time interval for history cleaner to check for files to delete. Files are only deleted if they are older than mapreduce.jobhistory.max-age-ms. mapreduce.jobhistory.cleaner.interval 1 day(s) mapreduce_jobhistory_cleaner_interval false
Job History Files Maximum Age Job history files older than this time duration will deleted when the history cleaner runs. mapreduce.jobhistory.max-age-ms 7 day(s) mapreduce_jobhistory_max_age_ms false
MapReduce ApplicationMaster Staging Root Directory The root HDFS directory of the staging area for users' MR2 jobs; for example /user. The staging directories are always named after the user. yarn.app.mapreduce.am.staging-dir /user yarn_app_mapreduce_am_staging_dir false

Performance

Display Name Description Related Name Default Value API Name Required
Maximum Process File Descriptors If configured, overrides the process soft and hard rlimits (also called ulimits) for file descriptors to the configured value. rlimit_fds false

Ports and Addresses

Display Name Description Related Name Default Value API Name Required
MapReduce JobHistory Server Port The port of the MapReduce JobHistory Server. Together with the host name of the JobHistory role forms the address. mapreduce.jobhistory.address 10020 mapreduce_jobhistory_address false
MapReduce JobHistory Web Application HTTP Port The HTTP port of the MapReduce JobHistory Server web application. Together with the host name of the JobHistory role forms the address. mapreduce.jobhistory.webapp.address 19888 mapreduce_jobhistory_webapp_address false
MapReduce JobHistory Web Application HTTPS Port (SSL) The HTTPS port of the MapReduce JobHistory Server web application. Together with the host name of the JobHistory role forms the address. mapreduce.jobhistory.webapp.https.address 19890 mapreduce_jobhistory_webapp_https_address false
Bind JobHistory Server to Wildcard Address If enabled, the JobHistory Server binds to the wildcard address ("0.0.0.0") on all of its ports. false yarn_jobhistory_bind_wildcard false

Resource Management

Display Name Description Related Name Default Value API Name Required
Java Heap Size of JobHistory Server in Bytes Maximum size in bytes for the Java Process heap memory. Passed to Java -Xmx. 1 GiB mr2_jobhistory_java_heapsize false
Cgroup CPU Shares Number of CPU shares to assign to this role. The greater the number of shares, the larger the share of the host's CPUs that will be given to this role when the host experiences CPU contention. Must be between 2 and 262144. Defaults to 1024 for processes not managed by Cloudera Manager. cpu.shares 1024 rm_cpu_shares true
Cgroup I/O Weight Weight for the read I/O requests issued by this role. The greater the weight, the higher the priority of the requests when the host experiences I/O contention. Must be between 100 and 1000. Defaults to 1000 for processes not managed by Cloudera Manager. blkio.weight 500 rm_io_weight true
Cgroup Memory Hard Limit Hard memory limit to assign to this role, enforced by the Linux kernel. When the limit is reached, the kernel will reclaim pages charged to the process. If reclaiming fails, the kernel may kill the process. Both anonymous as well as page cache pages contribute to the limit. Use a value of -1 B to specify no limit. By default processes not managed by Cloudera Manager will have no limit. memory.limit_in_bytes -1 MiB rm_memory_hard_limit true
Cgroup Memory Soft Limit Soft memory limit to assign to this role, enforced by the Linux kernel. When the limit is reached, the kernel will reclaim pages charged to the process if and only if the host is facing memory pressure. If reclaiming fails, the kernel may kill the process. Both anonymous as well as page cache pages contribute to the limit. Use a value of -1 B to specify no limit. By default processes not managed by Cloudera Manager will have no limit. memory.soft_limit_in_bytes -1 MiB rm_memory_soft_limit true

NodeManager Default Group

Advanced

Display Name Description Related Name Default Value API Name Required
Hadoop Metrics2 Advanced Configuration Snippet (Safety Valve) Advanced Configuration Snippet (Safety Valve) for Hadoop Metrics2. Properties will be inserted into hadoop-metrics2.properties. hadoop_metrics2_safety_valve false
CGroups Hierarchy Path (rooted in the cgroups hierarchy on the machine) where to place YARN-managed cgroups. yarn.nodemanager.linux-container-executor.cgroups.hierarchy /hadoop-yarn linux_container_executor_cgroups_hierarchy false
NodeManager Logging Advanced Configuration Snippet (Safety Valve) For advanced use only, a string to be inserted into log4j.properties for this role only. log4j_safety_valve false
Healthchecker Script Arguments Comma-separated list of arguments which are to be passed to node health script when it is being launched. yarn.nodemanager.health-checker.script.opts mapred_healthchecker_script_args false
Healthchecker Script Path Absolute path to the script which is periodically run by the node health monitoring service to determine if the node is healthy or not. If the value of this key is empty or the file does not exist in the location configured here, the node health monitoring service is not started. yarn.nodemanager.health-checker.script.path mapred_healthchecker_script_path false
Java Configuration Options for NodeManager These arguments will be passed as part of the Java command line. Commonly, garbage collection flags or extra debugging flags would be passed here. -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:-CMSConcurrentMTEnabled -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled node_manager_java_opts false
NodeManager Advanced Configuration Snippet (Safety Valve) for yarn-site.xml For advanced use only, a string to be inserted into yarn-site.xml for this role only. nodemanager_config_safety_valve false
NodeManager Advanced Configuration Snippet (Safety Valve) for mapred-site.xml For advanced use only, a string to be inserted into mapred-site.xml for this role only. nodemanager_mapred_safety_valve false
Heap Dump Directory Path to directory where heap dumps are generated when java.lang.OutOfMemoryError error is thrown. This directory is automatically created if it doesn't exist. However, if this directory already exists, role user must have write access to this directory. If this directory is shared amongst multiple roles, it should have 1777 permissions. Note that the heap dump files are created with 600 permissions and are owned by the role user. The amount of free space in this directory should be greater than the maximum Java Process heap size configured for this role. /tmp oom_heap_dump_dir false
Dump Heap When Out of Memory When set, generates heap dump file when java.lang.OutOfMemoryError is thrown. false oom_heap_dump_enabled true
Kill When Out of Memory When set, a SIGKILL signal is sent to the role process when java.lang.OutOfMemoryError is thrown. true oom_sigkill_enabled true
Automatically Restart Process When set, this role's process is automatically (and transparently) restarted in the event of an unexpected failure. true process_auto_restart true
Localized Dir Deletion Delay Number of seconds after an application finishes before the NodeManager's DeletionService will delete the application's localized file and log directory. To diagnose YARN application problems, set this property's value large enough (for example, to 600 = 10 minutes) to permit examination of these directories. yarn.nodemanager.delete.debug-delay-sec 0 yarn_nodemanager_delete_debug_delay_sec false

Logs

Display Name Description Related Name Default Value API Name Required
NodeManager Logging Threshold The minimum log level for NodeManager logs INFO log_threshold false
NodeManager Maximum Log File Backups The maximum number of rolled log files to keep for NodeManager logs. Typically used by log4j. 10 max_log_backup_index false
NodeManager Max Log Size The maximum size, in megabytes, per log file for NodeManager logs. Typically used by log4j. 200 MiB max_log_size false
NodeManager Log Directory Directory where NodeManager will place its log files. hadoop.log.dir /var/log/hadoop-yarn node_manager_log_dir false

Monitoring

Display Name Description Related Name Default Value API Name Required
Enable Health Alerts for this Role When set, Cloudera Manager will send alerts when the health of this role reaches the threshold specified by the EventServer setting eventserver_health_events_alert_threshold true enable_alerts false
Enable Configuration Change Alerts When set, Cloudera Manager will send alerts when this entity's configuration changes. false enable_config_alerts false
Log Directory Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory. Warning: 10 GiB, Critical: 5 GiB log_directory_free_space_absolute_thresholds false
Log Directory Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Log Directory Free Space Monitoring Absolute Thresholds setting is configured. Warning: Never, Critical: Never log_directory_free_space_percentage_thresholds false
Rules to Extract Events from Log Files This file contains the rules which govern how log messages are turned into events by the custom log4j appender that this role loads. It is in JSON format, and is composed of a list of rules. Every log message is evaluated against each of these rules in turn to decide whether or not to send an event for that message.Each rule has some or all of the following fields:
  • alert
    - whether or not events generated from this rule should be promoted to alerts. A value of "true" will cause alerts to be generated. If not specified, the default is "false".
  • rate
    (mandatory) - the maximum number of log messages matching this rule that may be sent as events every minute. If more than rate matching log messages are received in a single minute, the extra messages are ignored. If rate is less than 0, the number of messages per minute is unlimited.
  • periodminutes
    - the number of minutes during which the publisher will only publish rate events or fewer. If not specified, the default is one minute
  • threshold
    - apply this rule only to messages with this log4j severity level or above. An example is "WARN" for warning level messages or higher.
  • content
    - match only those messages whose contents match this regular expression.
  • exceptiontype
    - match only those messages which are part of an exception message. The exception type must match this regular expression.
Example:
{"alert": false, "rate": 10, "exceptiontype": "java.lang.StringIndexOutOfBoundsException"}
This rule will send events to Cloudera Manager for every 
StringIndexOutOfBoundsException
, up to a maximum of 10 every minute.		 version: 0, rules: [ alert: false, rate: 1, periodminutes: 1, threshold:FATAL, alert: false, rate: 0, threshold:WARN, content: .* is deprecated. Instead, use .*, alert: false, rate: 0, threshold:WARN, content: .* is deprecated. Use .* instead, alert: false, rate: 1, periodminutes: 2, exceptiontype: .*, alert: false, rate: 1, periodminutes: 1, threshold:WARN ] log_event_whitelist false
NodeManager Connectivity Health Check Enables the health check that verifies the NodeManager is connected to the ResourceManager true nodemanager_connectivity_health_enabled false
NodeManager Connectivity Tolerance at Startup The amount of time to wait for the NodeManager to fully start up and connect to the ResourceManager before enforcing the connectivity check. 3 minute(s) nodemanager_connectivity_tolerance_seconds false
File Descriptor Monitoring Thresholds The health test thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit. Warning: 50.0 %, Critical: 70.0 % nodemanager_fd_thresholds false
Garbage Collection Duration Thresholds The health test thresholds for the weighted average time spent in Java garbage collection. Specified as a percentage of elapsed wall clock time. Warning: 30.0, Critical: 60.0 nodemanager_gc_duration_thresholds false
Garbage Collection Duration Monitoring Period The period to review when computing the moving average of garbage collection time. 5 minute(s) nodemanager_gc_duration_window false
NodeManager Host Health Test When computing the overall NodeManager health, consider the host's health. true nodemanager_host_health_enabled false
NodeManager Process Health Test Enables the health test that the NodeManager's process state is consistent with the role configuration true nodemanager_scm_health_enabled false
Web Metric Collection Enables the health test that the Cloudera Manager Agent can successfully contact and gather metrics from the web server. true nodemanager_web_metric_collection_enabled false
Web Metric Collection Duration The health test thresholds on the duration of the metrics request to the web server. Warning: 10 second(s), Critical: Never nodemanager_web_metric_collection_thresholds false
Role Triggers The configured triggers for this role. This is a JSON formatted list of triggers. These triggers are evaluated as part as the health system. Every trigger expression is parsed, and if the trigger condition is met, the list of actions provided in the trigger expression is executed.Each trigger has all of the following fields:
  • triggerName (mandatory) - the name of the trigger. This value must be unique for the specific role.
  • triggerExpression (mandatory) - a tsquery expression representing the trigger.
  • streamThreshold (optional) - the maximum number of streams that can satisfy a condition of a trigger before the condition fires. By default set to 0, and any stream returned will cause the condition to fire.
  • enabled (optional) - by default set to 'true'. If set to 'false' the trigger will not be evaluated.
For example, here is a JSON formatted trigger configured for a DataNode that fires if the DataNode has more than 1500 file-descriptors opened:
[{"triggerName": "sample-trigger",
  "triggerExpression": "IF (SELECT fd_open WHERE roleName=$ROLENAME and last(fd_open) > 1500) DO health:bad",
  "streamThreshold": 0, "enabled": "true"}]
Consult the trigger rules documentation for more details on how to write triggers using tsquery.The JSON format is evolving and may change in the future and as a result backward compatibility is not guaranteed between releases at this time.		 [] role_triggers true
Unexpected Exits Thresholds The health test thresholds for unexpected exits encountered within a recent period specified by the unexpected_exits_window configuration for the role. Warning: Never, Critical: Any unexpected_exits_thresholds false
Unexpected Exits Monitoring Period The period to review when computing unexpected exits. 5 minute(s) unexpected_exits_window false

Other

Display Name Description Related Name Default Value API Name Required
Enable Shuffle Auxiliary Service If enabled, adds 'org.apache.hadoop.mapred.ShuffleHandler' to the NodeManager auxiliary services. This is required for MapReduce applications. true mapreduce_aux_service false
Containers Environment Variable Environment variables that should be forwarded from the NodeManager's environment to the container's. yarn.nodemanager.admin-env MALLOC_ARENA_MAX=$MALLOC_ARENA_MAX yarn_nodemanager_admin_env false
Container Manager Thread Count Number of threads container manager uses. yarn.nodemanager.container-manager.thread-count 20 yarn_nodemanager_container_manager_thread_count false
Cleanup Thread Count Number of threads used in cleanup. yarn.nodemanager.delete.thread-count 4 yarn_nodemanager_delete_thread_count false
Containers Environment Variables Whitelist Environment variables that containers may override rather than use NodeManager's default. yarn.nodemanager.env-whitelist JAVA_HOME, HADOOP_COMMON_HOME, HADOOP_HDFS_HOME, HADOOP_CONF_DIR, YARN_HOME yarn_nodemanager_env_whitelist false
Heartbeat Interval Heartbeat interval to ResourceManager yarn.nodemanager.heartbeat.interval-ms 1 second(s) yarn_nodemanager_heartbeat_interval_ms false
NodeManager Local Directory List List of directories on the local filesystem where a NodeManager stores intermediate data files. yarn.nodemanager.local-dirs yarn_nodemanager_local_dirs true
Localizer Cache Cleanup Interval Address where the localizer IPC is. yarn.nodemanager.localizer.cache.cleanup.interval-ms 10 minute(s) yarn_nodemanager_localizer_cache_cleanup_interval_ms false
Localizer Cache Target Size Target size of localizer cache in MB, per local directory. yarn.nodemanager.localizer.cache.target-size-mb 10 GiB yarn_nodemanager_localizer_cache_target_size_mb false
Localizer Client Thread Count Number of threads to handle localization requests. yarn.nodemanager.localizer.client.thread-count 5 yarn_nodemanager_localizer_client_thread_count false
Localizer Fetch Thread Count Number of threads to use for localization fetching. yarn.nodemanager.localizer.fetch.thread-count 4 yarn_nodemanager_localizer_fetch_thread_count false
NodeManager Container Log Directories List of directories on the local filesystem where a NodeManager stores container log files. yarn.nodemanager.log-dirs /var/log/hadoop-yarn/container yarn_nodemanager_log_dirs true
Log Retain Duration Time in seconds to retain user logs. Only applicable if log aggregation is disabled. yarn.nodemanager.log.retain-seconds 3 hour(s) yarn_nodemanager_log_retain_seconds false
Remote App Log Directory HDFS directory where application logs are stored when an application completes. yarn.nodemanager.remote-app-log-dir /tmp/logs yarn_nodemanager_remote_app_log_dir false
Remote App Log Directory Suffix The remote log dir will be created at {yarn.nodemanager.remote-app-log-dir}/${user}/{thisParam} yarn.nodemanager.remote-app-log-dir-suffix logs yarn_nodemanager_remote_app_log_dir_suffix false

Performance

Display Name Description Related Name Default Value API Name Required
Maximum Process File Descriptors If configured, overrides the process soft and hard rlimits (also called ulimits) for file descriptors to the configured value. rlimit_fds false

Ports and Addresses

Display Name Description Related Name Default Value API Name Required
NodeManager Web Application HTTPS Port (SSL) The HTTPS port of the NodeManager web application. yarn.nodemanager.webapp.https.address 8044 nodemanager_webserver_https_port false
NodeManager Web Application HTTP Port The HTTP Port of the NodeManager web application. yarn.nodemanager.webapp.address 8042 nodemanager_webserver_port false
NodeManager IPC Address The address of the NodeManager IPC. yarn.nodemanager.address 8041 yarn_nodemanager_address false
Localizer Port Address where the localizer IPC is. yarn.nodemanager.localizer.address 8040 yarn_nodemanager_localizer_address false

Resource Management

Display Name Description Related Name Default Value API Name Required
Java Heap Size of NodeManager in Bytes Maximum size in bytes for the Java Process heap memory. Passed to Java -Xmx. 1 GiB node_manager_java_heapsize false
Cgroup CPU Shares Number of CPU shares to assign to this role. The greater the number of shares, the larger the share of the host's CPUs that will be given to this role when the host experiences CPU contention. Must be between 2 and 262144. Defaults to 1024 for processes not managed by Cloudera Manager. cpu.shares 1024 rm_cpu_shares true
Cgroup I/O Weight Weight for the read I/O requests issued by this role. The greater the weight, the higher the priority of the requests when the host experiences I/O contention. Must be between 100 and 1000. Defaults to 1000 for processes not managed by Cloudera Manager. blkio.weight 500 rm_io_weight true
Cgroup Memory Hard Limit Hard memory limit to assign to this role, enforced by the Linux kernel. When the limit is reached, the kernel will reclaim pages charged to the process. If reclaiming fails, the kernel may kill the process. Both anonymous as well as page cache pages contribute to the limit. Use a value of -1 B to specify no limit. By default processes not managed by Cloudera Manager will have no limit. memory.limit_in_bytes -1 MiB rm_memory_hard_limit true
Cgroup Memory Soft Limit Soft memory limit to assign to this role, enforced by the Linux kernel. When the limit is reached, the kernel will reclaim pages charged to the process if and only if the host is facing memory pressure. If reclaiming fails, the kernel may kill the process. Both anonymous as well as page cache pages contribute to the limit. Use a value of -1 B to specify no limit. By default processes not managed by Cloudera Manager will have no limit. memory.soft_limit_in_bytes -1 MiB rm_memory_soft_limit true
Container Virtual CPU Cores Number of virtual CPU cores that can be allocated for containers. This parameter has no effect prior to CDH 4.4. yarn.nodemanager.resource.cpu-vcores 8 yarn_nodemanager_resource_cpu_vcores true
Container Memory Amount of physical memory, in MiB, that can be allocated for containers. yarn.nodemanager.resource.memory-mb 8 GiB yarn_nodemanager_resource_memory_mb true

Security

Display Name Description Related Name Default Value API Name Required
Container Executor Group The system group that owns the container-executor binary. This does not need to be changed unless the ownership of the binary is explicitly changed. yarn.nodemanager.linux-container-executor.group yarn container_executor_group false
Minimum User ID The minimum Linux user ID allowed. Used to prevent other super users. min.user.id 1000 container_executor_min_user_id false

ResourceManager Default Group

Advanced

Display Name Description Related Name Default Value API Name Required
Hadoop Metrics2 Advanced Configuration Snippet (Safety Valve) Advanced Configuration Snippet (Safety Valve) for Hadoop Metrics2. Properties will be inserted into hadoop-metrics2.properties. hadoop_metrics2_safety_valve false
ResourceManager Logging Advanced Configuration Snippet (Safety Valve) For advanced use only, a string to be inserted into log4j.properties for this role only. log4j_safety_valve false
Heap Dump Directory Path to directory where heap dumps are generated when java.lang.OutOfMemoryError error is thrown. This directory is automatically created if it doesn't exist. However, if this directory already exists, role user must have write access to this directory. If this directory is shared amongst multiple roles, it should have 1777 permissions. Note that the heap dump files are created with 600 permissions and are owned by the role user. The amount of free space in this directory should be greater than the maximum Java Process heap size configured for this role. /tmp oom_heap_dump_dir false
Dump Heap When Out of Memory When set, generates heap dump file when java.lang.OutOfMemoryError is thrown. false oom_heap_dump_enabled true
Kill When Out of Memory When set, a SIGKILL signal is sent to the role process when java.lang.OutOfMemoryError is thrown. true oom_sigkill_enabled true
Automatically Restart Process When set, this role's process is automatically (and transparently) restarted in the event of an unexpected failure. false process_auto_restart true
Java Configuration Options for ResourceManager These arguments will be passed as part of the Java command line. Commonly, garbage collection flags or extra debugging flags would be passed here. -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:-CMSConcurrentMTEnabled -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled resource_manager_java_opts false
ResourceManager Advanced Configuration Snippet (Safety Valve) for yarn-site.xml For advanced use only, a string to be inserted into yarn-site.xml for this role only. resourcemanager_config_safety_valve false
ResourceManager Advanced Configuration Snippet (Safety Valve) for mapred-site.xml For advanced use only, a string to be inserted into mapred-site.xml for this role only. resourcemanager_mapred_safety_valve false
ResourceManager Advanced Configuration Snippet (Safety Valve) for nodes_allow.txt For advanced use only, a string to be inserted into nodes_allow.txt for this role only. rm_hosts_allow_safety_valve false
ResourceManager Advanced Configuration Snippet (Safety Valve) for nodes_exclude.txt For advanced use only, a string to be inserted into nodes_exclude.txt for this role only. rm_hosts_exclude_safety_valve false

Logs

Display Name Description Related Name Default Value API Name Required
ResourceManager Logging Threshold The minimum log level for ResourceManager logs INFO log_threshold false
ResourceManager Maximum Log File Backups The maximum number of rolled log files to keep for ResourceManager logs. Typically used by log4j. 10 max_log_backup_index false
ResourceManager Max Log Size The maximum size, in megabytes, per log file for ResourceManager logs. Typically used by log4j. 200 MiB max_log_size false
ResourceManager Log Directory Directory where ResourceManager will place its log files. hadoop.log.dir /var/log/hadoop-yarn resource_manager_log_dir false

Monitoring

Display Name Description Related Name Default Value API Name Required
Enable Health Alerts for this Role When set, Cloudera Manager will send alerts when the health of this role reaches the threshold specified by the EventServer setting eventserver_health_events_alert_threshold true enable_alerts false
Enable Configuration Change Alerts When set, Cloudera Manager will send alerts when this entity's configuration changes. false enable_config_alerts false
Log Directory Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory. Warning: 10 GiB, Critical: 5 GiB log_directory_free_space_absolute_thresholds false
Log Directory Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Log Directory Free Space Monitoring Absolute Thresholds setting is configured. Warning: Never, Critical: Never log_directory_free_space_percentage_thresholds false
Rules to Extract Events from Log Files This file contains the rules which govern how log messages are turned into events by the custom log4j appender that this role loads. It is in JSON format, and is composed of a list of rules. Every log message is evaluated against each of these rules in turn to decide whether or not to send an event for that message.Each rule has some or all of the following fields:
  • alert
    - whether or not events generated from this rule should be promoted to alerts. A value of "true" will cause alerts to be generated. If not specified, the default is "false".
  • rate
    (mandatory) - the maximum number of log messages matching this rule that may be sent as events every minute. If more than rate matching log messages are received in a single minute, the extra messages are ignored. If rate is less than 0, the number of messages per minute is unlimited.
  • periodminutes
    - the number of minutes during which the publisher will only publish rate events or fewer. If not specified, the default is one minute
  • threshold
    - apply this rule only to messages with this log4j severity level or above. An example is "WARN" for warning level messages or higher.
  • content
    - match only those messages whose contents match this regular expression.
  • exceptiontype
    - match only those messages which are part of an exception message. The exception type must match this regular expression.
Example:
{"alert": false, "rate": 10, "exceptiontype": "java.lang.StringIndexOutOfBoundsException"}
This rule will send events to Cloudera Manager for every 
StringIndexOutOfBoundsException
, up to a maximum of 10 every minute.		 version: 0, rules: [ alert: false, rate: 1, periodminutes: 1, threshold:FATAL, alert: false, rate: 0, threshold:WARN, content: .* is deprecated. Instead, use .*, alert: false, rate: 0, threshold:WARN, content: .* is deprecated. Use .* instead, alert: false, rate: 1, periodminutes: 2, exceptiontype: .*, alert: false, rate: 1, periodminutes: 1, threshold:WARN ] log_event_whitelist false
File Descriptor Monitoring Thresholds The health test thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit. Warning: 50.0 %, Critical: 70.0 % resourcemanager_fd_thresholds false
Garbage Collection Duration Thresholds The health test thresholds for the weighted average time spent in Java garbage collection. Specified as a percentage of elapsed wall clock time. Warning: 30.0, Critical: 60.0 resourcemanager_gc_duration_thresholds false
Garbage Collection Duration Monitoring Period The period to review when computing the moving average of garbage collection time. 5 minute(s) resourcemanager_gc_duration_window false
ResourceManager Host Health Test When computing the overall ResourceManager health, consider the host's health. true resourcemanager_host_health_enabled false
ResourceManager Process Health Test Enables the health test that the ResourceManager's process state is consistent with the role configuration true resourcemanager_scm_health_enabled false
Health Check Startup Tolerance The amount of time allowed after this role is started that failures of health checks that rely on communication with this role will be tolerated. 5 minute(s) resourcemanager_startup_tolerance_minutes false
Web Metric Collection Enables the health test that the Cloudera Manager Agent can successfully contact and gather metrics from the web server. true resourcemanager_web_metric_collection_enabled false
Web Metric Collection Duration The health test thresholds on the duration of the metrics request to the web server. Warning: 10 second(s), Critical: Never resourcemanager_web_metric_collection_thresholds false
Role Triggers The configured triggers for this role. This is a JSON formatted list of triggers. These triggers are evaluated as part as the health system. Every trigger expression is parsed, and if the trigger condition is met, the list of actions provided in the trigger expression is executed.Each trigger has all of the following fields:
  • triggerName (mandatory) - the name of the trigger. This value must be unique for the specific role.
  • triggerExpression (mandatory) - a tsquery expression representing the trigger.
  • streamThreshold (optional) - the maximum number of streams that can satisfy a condition of a trigger before the condition fires. By default set to 0, and any stream returned will cause the condition to fire.
  • enabled (optional) - by default set to 'true'. If set to 'false' the trigger will not be evaluated.
For example, here is a JSON formatted trigger configured for a DataNode that fires if the DataNode has more than 1500 file-descriptors opened:
[{"triggerName": "sample-trigger",
  "triggerExpression": "IF (SELECT fd_open WHERE roleName=$ROLENAME and last(fd_open) > 1500) DO health:bad",
  "streamThreshold": 0, "enabled": "true"}]
Consult the trigger rules documentation for more details on how to write triggers using tsquery.The JSON format is evolving and may change in the future and as a result backward compatibility is not guaranteed between releases at this time.		 [] role_triggers true
Unexpected Exits Thresholds The health test thresholds for unexpected exits encountered within a recent period specified by the unexpected_exits_window configuration for the role. Warning: Never, Critical: Any unexpected_exits_thresholds false
Unexpected Exits Monitoring Period The period to review when computing unexpected exits. 5 minute(s) unexpected_exits_window false

Other

Display Name Description Related Name Default Value API Name Required
Capacity Scheduler Configuration Enter an XML string that represents the Capacity Scheduler configuration. <?xml version=1.0?> <configuration> <property> <name>yarn.scheduler.capacity.root.queues</name> <value>default</value> </property> <property> <name>yarn.scheduler.capacity.root.capacity</name> <value>100</value> </property> <property> <name>yarn.scheduler.capacity.root.default.capacity</name> <value>100</value> </property> </configuration> resourcemanager_capacity_scheduler_configuration true
Fair Scheduler Assign Multiple Tasks Enables multiple Fair Scheduler container assignments in one heartbeat, which improves cluster throughput when there are many small tasks to run. yarn.scheduler.fair.assignmultiple false resourcemanager_fair_scheduler_assign_multiple true
Fair Scheduler XML Advanced Configuration Snippet (Safety Valve) An XML string that will be inserted verbatim into the Fair Scheduler allocations file. For CDH5, overrides the configuration set using the Pools configuration UI. For CDH4, this is the only way to configure the Fair Scheduler for YARN. resourcemanager_fair_scheduler_configuration false
Fair Scheduler Preemption When enabled, if a pool's minimum share is not met for some period of time, the Fair Scheduler preempts applications in other pools. Preemption guarantees that production applications are not starved while also allowing the cluster to be used for experimental and research applications. To minimize wasted computation, the Fair Scheduler preempts the most recently launched applications. yarn.scheduler.fair.preemption false resourcemanager_fair_scheduler_preemption true
Fair Scheduler Size-Based Weight When enabled, the Fair Scheduler will assign shares to individual apps based on their size, rather than providing an equal share to all apps regardless of size. yarn.scheduler.fair.sizebasedweight false resourcemanager_fair_scheduler_size_based_weight true
Fair Scheduler User As Default Queue When set to true, the Fair Scheduler uses the username as the default pool name, in the event that a pool name is not specified. When set to false, all applications are run in a shared pool, called default. yarn.scheduler.fair.user-as-default-queue true resourcemanager_fair_scheduler_user_as_default_queue true
ApplicationMaster Monitor Expiry The expiry interval to wait until an ApplicationMaster is considered dead. yarn.am.liveness-monitor.expiry-interval-ms 10 minute(s) yarn_am_liveness_monitor_expiry_interval_ms false
NodeManager Monitor Expiry The expiry interval to wait until a NodeManager is considered dead. yarn.nm.liveness-monitor.expiry-interval-ms 10 minute(s) yarn_nm_liveness_monitor_expiry_interval_ms false
Admin Client Thread Count Number of threads used to handle the ResourceManager admin interface. yarn.resourcemanager.admin.client.thread-count 1 yarn_resourcemanager_admin_client_thread_count false
ApplicationMaster Max Retries The maximum number that an ApplicationMaster will retry. yarn.resourcemanager.am.max-retries 1 yarn_resourcemanager_am_max_retries false
ApplicationMaster Monitor Interval The periodic interval that the ResourceManager will check whether ApplicationMasters is still alive. yarn.resourcemanager.amliveliness-monitor.interval-ms 1 second(s) yarn_resourcemanager_amliveliness_monitor_interval_ms false
Client Thread Count The number of threads used to handle applications manager requests. yarn.resourcemanager.client.thread-count 50 yarn_resourcemanager_client_thread_count false
Container Monitor Interval The periodic interval that the ResourceManager will check whether containers are still alive. yarn.resourcemanager.container.liveness-monitor.interval-ms 10 minute(s) yarn_resourcemanager_container_liveness_monitor_interval_ms false
Max Completed Applications The maximum number of completed applications that the ResourceManager keeps. yarn.resourcemanager.max-completed-applications 10000 yarn_resourcemanager_max_completed_applications false
NodeManager Monitor Interval The periodic interval that the ResourceManager will check whether NodeManagers are still alive. yarn.resourcemanager.nm.liveness-monitor.interval-ms 1 second(s) yarn_resourcemanager_nm_liveness_monitor_interval_ms false
Enable ResourceManager Recovery When enabled, any applications that were running on the cluster when the ResourceManager died will be recovered when the ResourceManager next starts. Note: If RM-HA is enabled, then this configuration is always enabled. yarn.resourcemanager.recovery.enabled false yarn_resourcemanager_recovery_enabled false
Resource Tracker Thread Count Number of threads to handle resource tracker calls. yarn.resourcemanager.resource-tracker.client.thread-count 50 yarn_resourcemanager_resource_tracker_client_thread_count false
Scheduler Class The class to use as the resource scheduler. FairScheduler is only supported in CDH 4.2.1 and later. yarn.resourcemanager.scheduler.class org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler yarn_resourcemanager_scheduler_class false
Scheduler Thread Count The number of threads used to handle requests through the scheduler interface. yarn.resourcemanager.scheduler.client.thread-count 50 yarn_resourcemanager_scheduler_client_thread_count false

Performance

Display Name Description Related Name Default Value API Name Required
Maximum Process File Descriptors If configured, overrides the process soft and hard rlimits (also called ulimits) for file descriptors to the configured value. rlimit_fds false

Ports and Addresses

Display Name Description Related Name Default Value API Name Required
ResourceManager Web Application HTTPS Port (SSL) The HTTPS port of the ResourceManager web application. yarn.resourcemanager.webapp.https.address 8090 resourcemanager_webserver_https_port false
ResourceManager Web Application HTTP Port The HTTP port of the ResourceManager web application. yarn.resourcemanager.webapp.address 8088 resourcemanager_webserver_port false
ResourceManager Address The address of the applications manager interface in the ResourceManager. yarn.resourcemanager.address 8032 yarn_resourcemanager_address false
Administration Address The address of the admin interface in the ResourceManager. yarn.resourcemanager.admin.address 8033 yarn_resourcemanager_admin_address false
Resource Tracker Address The address of the resource tracker interface in the ResourceManager. yarn.resourcemanager.resource-tracker.address 8031 yarn_resourcemanager_resource_tracker_address false
Scheduler Address The address of the scheduler interface in the ResourceManager. yarn.resourcemanager.scheduler.address 8030 yarn_resourcemanager_scheduler_address false
Bind ResourceManager to Wildcard Address If enabled, the ResourceManager binds to the wildcard address ("0.0.0.0") on all of its ports. false yarn_rm_bind_wildcard false

Resource Management

Display Name Description Related Name Default Value API Name Required
Java Heap Size of ResourceManager in Bytes Maximum size in bytes for the Java Process heap memory. Passed to Java -Xmx. 1 GiB resource_manager_java_heapsize false
Fair Scheduler Node Locality Threshold For applications that request containers on particular nodes, the number of scheduling opportunities since the last container assignment to wait before accepting a placement on another node. Expressed as a float between 0 and 1, which, as a fraction of the cluster size, is the number of scheduling opportunities to pass up. If not set, this means don't pass up any scheduling opportunities. Requires Fair Scheduler continuous scheduling to be disabled. If continuous scheduling is enabled, yarn.scheduler.fair.locality-delay-node-ms should be used instead. yarn.scheduler.fair.locality.threshold.node resourcemanager_fair_scheduler_locality_threshold_node false
Fair Scheduler Rack Locality Threshold For applications that request containers on particular racks, the number of scheduling opportunities since the last container assignment to wait before accepting a placement on another rack. Expressed as a float between 0 and 1, which, as a fraction of the cluster size, is the number of scheduling opportunities to pass up. If not set, this means don't pass up any scheduling opportunities. Requires Fair Scheduler continuous scheduling to be disabled. If continuous scheduling is enabled, yarn.scheduler.fair.locality-delay-rack-ms should be used instead. yarn.scheduler.fair.locality.threshold.rack resourcemanager_fair_scheduler_locality_threshold_rack false
Cgroup CPU Shares Number of CPU shares to assign to this role. The greater the number of shares, the larger the share of the host's CPUs that will be given to this role when the host experiences CPU contention. Must be between 2 and 262144. Defaults to 1024 for processes not managed by Cloudera Manager. cpu.shares 1024 rm_cpu_shares true
Cgroup I/O Weight Weight for the read I/O requests issued by this role. The greater the weight, the higher the priority of the requests when the host experiences I/O contention. Must be between 100 and 1000. Defaults to 1000 for processes not managed by Cloudera Manager. blkio.weight 500 rm_io_weight true
Cgroup Memory Hard Limit Hard memory limit to assign to this role, enforced by the Linux kernel. When the limit is reached, the kernel will reclaim pages charged to the process. If reclaiming fails, the kernel may kill the process. Both anonymous as well as page cache pages contribute to the limit. Use a value of -1 B to specify no limit. By default processes not managed by Cloudera Manager will have no limit. memory.limit_in_bytes -1 MiB rm_memory_hard_limit true
Cgroup Memory Soft Limit Soft memory limit to assign to this role, enforced by the Linux kernel. When the limit is reached, the kernel will reclaim pages charged to the process if and only if the host is facing memory pressure. If reclaiming fails, the kernel may kill the process. Both anonymous as well as page cache pages contribute to the limit. Use a value of -1 B to specify no limit. By default processes not managed by Cloudera Manager will have no limit. memory.soft_limit_in_bytes -1 MiB rm_memory_soft_limit true
Enable Fair Scheduler Continuous Scheduling Enable continuous scheduling in the Fair Scheduler. When enabled, scheduling decisions are decoupled from NodeManager heartbeats, leading to faster resource allocations. yarn.scheduler.fair.continuous-scheduling-enabled false yarn_scheduler_fair_continuous_scheduling_enabled false
Fair Scheduler Node Locality Delay For applications that request containers on particular nodes, the minimum time in milliseconds the Fair Scheduler waits before accepting a placement on another node. Requires Fair Scheduler continuous scheduling to be enabled. If continuous scheduling is disabled, yarn.scheduler.fair.locality.threshold.node should be used instead. yarn.scheduler.fair.locality-delay-node-ms 2 second(s) yarn_scheduler_fair_locality_delay_node_ms false
Fair Scheduler Rack Locality Delay For applications that request containers on particular racks, the minimum time in milliseconds the Fair Scheduler waits before accepting a placement on another rack. Requires Fair Scheduler continuous scheduling to be enabled. If continuous scheduling is disabled, yarn.scheduler.fair.locality.threshold.rack should be used instead. yarn.scheduler.fair.locality-delay-rack-ms 4 second(s) yarn_scheduler_fair_locality_delay_rack_ms false
Container Memory Increment If using the Fair Scheduler, memory requests will be rounded up to the nearest multiple of this number. This parameter has no effect prior to CDH 5. yarn.scheduler.increment-allocation-mb 512 MiB yarn_scheduler_increment_allocation_mb true
Container Virtual CPU Cores Increment If using the Fair Scheduler, virtual core requests will be rounded up to the nearest multiple of this number. This parameter has no effect prior to CDH 5. yarn.scheduler.increment-allocation-vcores 1 yarn_scheduler_increment_allocation_vcores true
Container Memory Maximum The largest amount of physical memory, in MiB, that can be requested for a container. yarn.scheduler.maximum-allocation-mb 64 GiB yarn_scheduler_maximum_allocation_mb true
Container Virtual CPU Cores Maximum The largest number of virtual CPU cores that can be requested for a container. This parameter has no effect prior to CDH 4.4. yarn.scheduler.maximum-allocation-vcores 32 yarn_scheduler_maximum_allocation_vcores true
Container Memory Minimum The smallest amount of physical memory, in MiB, that can be requested for a container. If using the Capacity or FIFO scheduler (or any scheduler, prior to CDH 5), memory requests will be rounded up to the nearest multiple of this number. yarn.scheduler.minimum-allocation-mb 1 GiB yarn_scheduler_minimum_allocation_mb true
Container Virtual CPU Cores Minimum The smallest number of virtual CPU cores that can be requested for a container. If using the Capacity or FIFO scheduler (or any scheduler, prior to CDH 5), virtual core requests will be rounded up to the nearest multiple of this number. This parameter has no effect prior to CDH 4.4. yarn.scheduler.minimum-allocation-vcores 1 yarn_scheduler_minimum_allocation_vcores true

Service-Wide

Advanced

Display Name Description Related Name Default Value API Name Required
System User's Home Directory The home directory of the system user on the local filesystem. This setting must reflect the system's configured value - only changing it here will not change the actual home directory. /var/lib/hadoop-yarn hdfs_user_home_dir true
System Group The group that this service's processes should run as. (Except the Job History Server, which has its own group) hadoop process_groupname true
System User The user that this service's processes should run as. (Except the Job History Server, which has its own user) yarn process_username true
YARN Application Classpath Entries to add to the classpaths of YARN applications. yarn.application.classpath $HADOOP_CONF_DIR, $HADOOP_COMMON_HOME/*, $HADOOP_COMMON_HOME/lib/*, $HADOOP_HDFS_HOME/*, $HADOOP_HDFS_HOME/lib/*, $HADOOP_MAPRED_HOME/*, $HADOOP_MAPRED_HOME/lib/*, $YARN_HOME/*, $YARN_HOME/lib/* yarn_application_classpath false
YARN Service Advanced Configuration Snippet (Safety Valve) for hadoop-policy.xml For advanced use only, a string to be inserted into hadoop-policy.xml. Applies to configurations of all roles in this service except client configuration. yarn_hadoop_policy_config_safety_valve false
YARN Service Advanced Configuration Snippet (Safety Valve) for yarn-site.xml For advanced use only, a string to be inserted into yarn-site.xml. Applies to configurations of all roles in this service except client configuration. yarn_service_config_safety_valve false
YARN Service Environment Advanced Configuration Snippet (Safety Valve) For advanced use only, key-value pairs (one on each line) to be inserted into a role's environment. Applies to configurations of all roles in this service except client configuration. yarn_service_env_safety_valve false
YARN Service MapReduce Advanced Configuration Snippet (Safety Valve) For advanced use only, a string to be inserted into mapred-site.xml. Applies to configurations of all roles in this service except client configuration. yarn_service_mapred_safety_valve false
YARN (MR2 Included) Service Advanced Configuration Snippet (Safety Valve) for ssl-client.xml For advanced use only, a string to be inserted into ssl-client.xml. Applies to configurations of all roles in this service except client configuration. yarn_ssl_client_safety_valve false
YARN (MR2 Included) Service Advanced Configuration Snippet (Safety Valve) for ssl-server.xml For advanced use only, a string to be inserted into ssl-server.xml. Applies to configurations of all roles in this service except client configuration. yarn_ssl_server_safety_valve false

Monitoring

Display Name Description Related Name Default Value API Name Required
Admin Users Applications List Visibility Settings Controls which applications an admin user can see in the applications list view ALL admin_application_list_settings true
Enable Log Event Capture When set, each role will identify important log events and forward them to Cloudera Manager. true catch_events false
Enable Service Level Health Alerts When set, Cloudera Manager will send alerts when the health of this service reaches the threshold specified by the EventServer setting eventserver_health_events_alert_threshold true enable_alerts false
Enable Configuration Change Alerts When set, Cloudera Manager will send alerts when this entity's configuration changes. false enable_config_alerts false
Log Event Retry Frequency The frequency in which the log4j event publication appender will retry sending undelivered log events to the Event server, in seconds 30 log_event_retry_frequency false
Service Triggers The configured triggers for this service. This is a JSON formatted list of triggers. These triggers are evaluated as part as the health system. Every trigger expression is parsed, and if the trigger condition is met, the list of actions provided in the trigger expression is executed.Each trigger has all of the following fields:
  • triggerName (mandatory) - the name of the trigger. This value must be unique for the specific service.
  • triggerExpression (mandatory) - a tsquery expression representing the trigger.
  • streamThreshold (optional) - the maximum number of streams that can satisfy a condition of a trigger before the condition fires. By default set to 0, and any stream returned will cause the condition to fire.
  • enabled (optional) - by default set to 'true'. If set to 'false' the trigger will not be evaluated.
For example, here is a JSON formatted trigger that fires if there are more than 10 DataNodes with more than 500 file-descriptors opened:
[{"triggerName": "sample-trigger",
  "triggerExpression": "IF (SELECT fd_open WHERE roleType = DataNode and last(fd_open) > 500) DO health:bad",
  "streamThreshold": 10, "enabled": "true"}]
Consult the trigger rules documentation for more details on how to write triggers using tsquery.The JSON format is evolving and may change in the future and as a result backward compatibility is not guaranteed between releases at this time.		 [] service_triggers true
Service Monitor Derived Configs Advanced Configuration Snippet (Safety Valve) For advanced use only, a list of derived configuration properties that will be used by the Service Monitor instead of the default ones. smon_derived_configs_safety_valve false
Non-Admin Users Applications List Visibility Settings Controls which applications non-admin users can see in the applications list view ALL user_application_list_settings true
YARN Application Aggregates Controls the aggregate metrics generated for YARN applications. The structure is a JSON list of the attributes to aggregate and the entities to aggregate to. For example, if the attributeName is 'maps_completed' and the aggregationTargets is ['USER'] then the Service Monitor will create the metric 'yarn_application_maps_completed_rate' and, every ten minutes, will record the total maps completed for each user across all their YARN applications. By default it will also record the number of applications submitted ('apps_submitted_rate') for both users and pool. For a full list of the supported attributes see the YARN search page. Note that the valid aggregation targets are USER, YARN_POOL, and YARN (the service), and that these aggregate metrics can be viewed on both the reports and charts search pages. [ attributeName: maps_total, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: reduces_total, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: cpu_milliseconds, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: mb_millis_maps, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: mb_millis_reduces, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: vcores_millis_maps, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: vcores_millis_reduces, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: file_bytes_read, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: file_bytes_written, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: hdfs_bytes_read, aggregationTargets: [USER, YARN_POOL, YARN] , attributeName: hdfs_bytes_written, aggregationTargets: [USER, YARN_POOL, YARN] ] yarn_application_aggregates false
JobHistory Server Role Health Test When computing the overall YARN health, consider JobHistory Server's health true yarn_jobhistoryserver_health_enabled false
Healthy NodeManager Monitoring Thresholds The health test thresholds of the overall NodeManager health. The check returns "Concerning" health if the percentage of "Healthy" NodeManagers falls below the warning threshold. The check is unhealthy if the total percentage of "Healthy" and "Concerning" NodeManagers falls below the critical threshold. Warning: 95.0 %, Critical: 90.0 % yarn_nodemanagers_healthy_thresholds false
ResourceManager Role Health Test When computing the overall YARN health, consider ResourceManager's health true yarn_resourcemanager_health_enabled false

Other

Display Name Description Related Name Default Value API Name Required
HDFS Service Name of the HDFS service that this YARN service instance depends on hdfs_service true
Enable ResourceManager ACLs Whether users and groups specified in Admin ACL should be checked for authorization to perform admin operations. yarn.acl.enable true yarn_acl_enable false
Admin ACL ACL that determines which users and groups can submit and kill applications in any pool, and can issue commands on ResourceManager roles. yarn.admin.acl * yarn_admin_acl false
Enable Log Aggregation Whether to enable log aggregation yarn.log-aggregation-enable true yarn_log_aggregation_enable false
Log Aggregation Retention Period How long to keep aggregation logs before deleting them. yarn.log-aggregation.retain-seconds 7 day(s) yarn_log_aggregation_retain_seconds false

Proxy

Display Name Description Related Name Default Value API Name Required
HDFS Proxy User Groups Comma-delimited list of groups that you want to allow the HDFS user to impersonate. The default '*' allows all groups. To disable entirely, use a string that doesn't correspond to a group name, such as '_no_group_'. hadoop.proxyuser.hdfs.groups * hdfs_proxy_user_groups_list false
HDFS Proxy User Hosts Comma-delimited list of hosts where you want to allow the HDFS user to impersonate other users. The default '*' allows all hosts. To disable entirely, use a string that doesn't correspond to a host name, such as '_no_host'. hadoop.proxyuser.hdfs.hosts * hdfs_proxy_user_hosts_list false
Hive Proxy User Groups Comma-delimited list of groups that you want to allow the Hive user to impersonate. The default '*' allows all groups. To disable entirely, use a string that doesn't correspond to a group name, such as '_no_group_'. hadoop.proxyuser.hive.groups * hive_proxy_user_groups_list false
Hive Proxy User Hosts Comma-delimited list of hosts where you want to allow the Hive user to impersonate other users. The default '*' allows all hosts. To disable entirely, use a string that doesn't correspond to a host name, such as '_no_host'. hadoop.proxyuser.hive.hosts * hive_proxy_user_hosts_list false
Hue Proxy User Groups Comma-delimited list of groups that you want to allow the Hue user to impersonate. The default '*' allows all groups. To disable entirely, use a string that doesn't correspond to a group name, such as '_no_group_'. hadoop.proxyuser.hue.groups * hue_proxy_user_groups_list false
Hue Proxy User Hosts Comma-delimited list of hosts where you want to allow the Hue user to impersonate other users. The default '*' allows all hosts. To disable entirely, use a string that doesn't correspond to a host name, such as '_no_host'. hadoop.proxyuser.hue.hosts * hue_proxy_user_hosts_list false
Llama Proxy User Groups Comma-delimited list of groups that you want to allow the Llama (AM for Impala) user to impersonate. The default '*' allows all groups. To disable entirely, use a string that doesn't correspond to a group name, such as '_no_group_'. hadoop.proxyuser.llama.groups * llama_proxy_user_groups_list false
Llama Proxy User Hosts Comma-delimited list of hosts where you want to allow the Llama (AM for Impala) user to impersonate other users. The default '*' allows all hosts. To disable entirely, use a string that doesn't correspond to a host name, such as '_no_host'. hadoop.proxyuser.llama.hosts * llama_proxy_user_hosts_list false
Oozie Proxy User Groups Whether the Oozie superuser can impersonate the members of a comma-delimited list of groups. The default '*' allows all groups. To disable entirely, use a string that doesn't correspond to a group name, such as '_no_group_'. hadoop.proxyuser.oozie.groups * oozie_proxy_user_groups_list false
Oozie Proxy User Hosts Comma-delimited list of hosts where you want to allow the Oozie user to impersonate other users. The default '*' allows all hosts. To disable entirely, use a string that doesn't correspond to a host name, such as '_no_host'. hadoop.proxyuser.oozie.hosts * oozie_proxy_user_hosts_list false

Resource Management

Display Name Description Related Name Default Value API Name Required
UNIX User for Nonsecure Mode with Linux Container Executor UNIX user that containers run as when Linux-container-executor is used in nonsecure mode. yarn.nodemanager.linux-container-executor.nonsecure-mode.local-user nobody yarn_nodemanager_linux_container_executor_nonsecure_mode_local_user false
Use CGroups for Resource Management Whether YARN creates a cgroup per container, thereby isolating the CPU usage of containers. When set, yarn.nodemanager.linux-container-executor.resources-handler.class is configured to org.apache.hadoop.yarn.server.nodemanager.util.CgroupsLCEResourcesHandler. The host (in Cloudera Manager) must have cgroups enabled. The number of shares allocated to all YARN containers is configured by adjusting the CPU shares value of the Node Manager in the Resource Management configuration group. yarn.nodemanager.linux-container-executor.resources-handler.class false yarn_service_cgroups false

Security

Display Name Description Related Name Default Value API Name Required
Enable Authentication for HTTP Web-Consoles Enables authentication for hadoop HTTP web-consoles for all roles of this service. Note: This is effective only if security is enabled for the HDFS service. false hadoop_secure_web_ui false
Page generated September 3, 2015.