Master Health Tests

Master File Descriptors

This Master health test checks that the number of file descriptors used does not rise above some percentage of the Master file descriptor limit. A failure of this health test may indicate a bug in either Hadoop or Cloudera Manager. Contact Cloudera support. This test can be configured using the File Descriptor Monitoring Thresholds Master monitoring setting.

Short Name: File Descriptors

Property Name Description Template Name Default Value Unit
File Descriptor Monitoring Thresholds The health test thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit. accumulo16_master_fd_thresholds critical:70.0, warning:50.0 PERCENT

Master GC Duration

This Master health test checks that the Master is not spending too much time performing Java garbage collection. It checks that no more than some percentage of recent time is spent performing Java garbage collection. A failure of this health test may indicate a capacity planning problem or misconfiguration of the Master. This test can be configured using the Garbage Collection Duration Thresholds and Garbage Collection Duration Monitoring Period Master monitoring settings.

Short Name: GC Duration

Property Name Description Template Name Default Value Unit
Garbage Collection Duration Monitoring Period The period to review when computing the moving average of garbage collection time. master_gc_duration_window 5 MINUTES
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. master_gc_duration_thresholds critical:60.0, warning:30.0 no unit

Master HBase Master Canary

This is an HBase Master health test that checks that a client can connect to and get basic information from the Master in a reasonable amount of time. The test returns "Bad" health if the connection to or basic queries of the Master fail. The test returns "Concerning" health if the connection attempt or queries do not complete in a reasonable time. A failure of this health test may indicate that the Master is failing to satisfy basic client requests correctly or in a timely fashion. Check the status of the Master, and look in the Master logs for more details. This test can be enabled or disabled using the HBase Master Canary Health Test HBase Master monitoring setting.

Short Name: HBase Master Canary

Property Name Description Template Name Default Value Unit
HBase Master Canary Health Test Enables the health test that a client can connect to the HBase Master master_canary_health_enabled true no unit

Master Heap Dump Directory Free Space

This Master health test checks that the filesystem containing the heap dump directory of this Master has sufficient free space. This test can be configured using the Heap Dump Directory Free Space Monitoring Absolute Thresholds and Heap Dump Directory Free Space Monitoring Percentage Thresholds Master monitoring settings.

Short Name: Heap Dump Directory Free Space

Property Name Description Template Name Default Value Unit
Heap Dump Directory Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's heap dump directory. heap_dump_directory_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
Heap Dump Directory Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's heap dump directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Heap Dump Directory Free Space Monitoring Absolute Thresholds setting is configured. heap_dump_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

Master Host Health

This Master health test factors in the health of the host upon which the Master is running. A failure of this test means that the host running the Master is experiencing some problem. See that host's status page for more details.This test can be enabled or disabled using the Master Host Health Test Master monitoring setting.

Short Name: Host Health

Property Name Description Template Name Default Value Unit
Master Host Health Test When computing the overall Master health, consider the host's health. accumulo16_master_host_health_enabled true no unit

Master Log Directory Free Space

This Master health test checks that the filesystem containing the log directory of this Master has sufficient free space. This test can be configured using the Log Directory Free Space Monitoring Absolute Thresholds and Log Directory Free Space Monitoring Percentage Thresholds Master monitoring settings.

Short Name: Log Directory Free Space

Property Name Description Template Name Default Value Unit
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. log_directory_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
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. log_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

Master Process Status

This Master health test checks that the Cloudera Manager Agent on the Master host is heart beating correctly and that the process associated with the Master role is in the state expected by Cloudera Manager. A failure of this health test may indicate a problem with the Master process, a lack of connectivity to the Cloudera Manager Agent on the Master host, or a problem with the Cloudera Manager Agent. This test can fail either because the Master has crashed or because the Master will not start or stop in a timely fashion. Check the Master logs for more details. If the test fails because of problems communicating with the Cloudera Manager Agent on the Master host, check the status of the Cloudera Manager Agent by running /etc/init.d/cloudera-scm-agent status on the Master host, or look in the Cloudera Manager Agent logs on the Master host for more details. This test can be enabled or disabled using the Master Process Health Test Master monitoring setting.

Short Name: Process Status

Property Name Description Template Name Default Value Unit
Master Process Health Test Enables the health test that the Master's process state is consistent with the role configuration accumulo16_master_scm_health_enabled true no unit

Master Swap Memory Usage

This Master health test checks the amount of swap memory in use by the role. A failure of this health test may indicate that your machine is overloaded. This test can be configured using the Process Swap Memory Thresholds monitoring settings.

Short Name: Swap Memory Usage

Property Name Description Template Name Default Value Unit
Process Swap Memory Thresholds The health test thresholds on the swap memory usage of the process. process_swap_memory_thresholds critical:never, warning:any BYTES

Master Unexpected Exits

This Master health test checks that the Master has not recently exited unexpectedly. The test returns "Bad" health if the number of unexpected exits exceeds a critical threshold. For example, if this test is configured with a critical threshold of 1, this test returns "Good" health if there have been no unexpected exits recently. If 1 or more unexpected exits occured recently, this test returns "Bad" health. The test also indicates whether any of the exits were caused by an OutOfMemory error if the Cloudera Manager Kill When Out of Memory monitoring setting is enabled. This test can be configured using the Unexpected Exits Thresholds and Unexpected Exits Monitoring Period Master monitoring settings.

Short Name: Unexpected Exits

Property Name Description Template Name Default Value Unit
Unexpected Exits Monitoring Period The period to review when computing unexpected exits. unexpected_exits_window 5 MINUTES
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. unexpected_exits_thresholds critical:any, warning:never no unit

Master Web Server Status

This health test checks that the role's web server is responding quickly to requests by the Cloudera Manager Agent, and that the Cloudera Manager Agent can collect metrics from the web server. Failure of this health test may indicate a problem with the web server of the Master, a misconfiguration of the Master, or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the Master for more detail. If the test failure message indicates a communication problem, the Cloudera Manager Agent's HTTP requests to the Master's web server are failing or timing out. If the test's failure message indicates an unexpected response, the Master's web server responded to the Cloudera Manager Agent's request, but the response could not be interpreted for some reason. This test can be configured using the Web Metric Collection Master monitoring setting.

Short Name: Web Server Status

Property Name Description Template Name Default Value Unit
Web Metric Collection Enables the health test that the Cloudera Manager Agent can successfully contact and gather metrics from the web server. master_web_metric_collection_enabled true no unit
Web Metric Collection Duration The health test thresholds on the duration of the metrics request to the web server. master_web_metric_collection_thresholds critical:never, warning:10000.0 MILLISECONDS