Host Monitor Health Tests

Host Monitor Audit Pipeline Test

This Host Monitor health test checks that the Auditing for the Host Monitor role is getting processed correctly and is not blocked. A failure of this health test may indicate a problem with the audit pipeline of Host Monitor process. This test can fail either because the Cloudera Audit Server is not accepting audits, or the Cloudera Manager Agent on the Host Monitor host isn't able to send audits because of some network issue. Check the Cloudera Manager Agent logs and Cloudera Audit Server logs for more details. This test can be enabled or disabled using the Navigator Audit Pipeline Health Check Host Monitor monitoring setting.

Short Name: Audit Pipeline Test

Monitoring Period For Audit Failures

Description
The period to review when checking if audits are blocked and not getting processed.
Template Name
mgmt_navigator_failure_window
Default Value
20
Unit(s)
MINUTES

Navigator Audit Failure Thresholds

Description
The health test thresholds for failures encountered when monitoring audits within a recent period specified by the mgmt_navigator_failure_window configuration for the role. The value that can be specified for this threshold is the number of bytes of audits data that is left to be sent to audit server.
Template Name
mgmt_navigator_failure_thresholds
Default Value
critical:any, warning:never
Unit(s)
BYTES

Navigator Audit Pipeline Health Check

Description
Enable test of audit events processing pipeline. This will test if audit events are not getting processed by Audit Server for a role that generates audit.
Template Name
mgmt_navigator_status_check_enabled
Default Value
true
Unit(s)
no unit

Host Monitor Cloudera Manager Descriptor Age

This is a Host Monitor health test that checks if the Cloudera Manager descriptor has been refreshed recently. The Cloudera Manager descriptor is used to pass configuration information from the Cloudera Manager Server to the Host Monitor. If the descriptor becomes stale, Host Monitor operation may be impacted because the Host Monitor will receive information about new hosts, roles, and services, or changes to existing hosts, roles, and services. A stale descriptor usually indicates problems communicating with the Cloudera Manager Server but can also indicate performance problems or a bug. Consult the Host Monitor log and the Cloudera Manager Server log for more information. This test can be configured using the Cloudera Manager Descriptor Age Thresholds Cloudera Manager Host Monitor setting.

Short Name: Cloudera Manager Descriptor Age

Cloudera Manager Descriptor Age Thresholds

Description
The health test thresholds for monitoring the time since the Cloudera Manager descriptor was last refreshed.
Template Name
scm_descriptor_age_thresholds
Default Value
critical:120000.0, warning:60000.0
Unit(s)
no unit

Host Monitor Cloudera Manager Metric Schema Age

This is a Host Monitor health test that checks if the Cloudera Manager metric schema has been refreshed recently. If the metric schema becomes stale, Host Monitor operation may be impacted because the Host Monitor will not receive information about new metrics and changes to existing metrics. A stale metric schema usually indicates problems communicating with the Cloudera Manager Server but can also indicate performance problems or a bug. Consult the Host Monitor log and the Cloudera Manager Server log for more information. This test can be configured using the Cloudera Manager Metric Schema Age Thresholds Cloudera Manager Host Monitor setting.

Short Name: Cloudera Manager Metric Schema Age

Cloudera Manager Metric Schema Age Thresholds

Description
The health test thresholds for monitoring the time since the Cloudera Manager metric schema was last refreshed.
Template Name
metric_schema_age_thresholds_name
Default Value
critical:120000.0, warning:60000.0
Unit(s)
no unit

Host Monitor File Descriptors

This Host Monitor health test checks that the number of file descriptors used does not rise above some percentage of the Host Monitor 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 Host Monitor monitoring setting.

Short Name: File Descriptors

File Descriptor Monitoring Thresholds

Description
The health test thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit.
Template Name
hostmonitor_fd_thresholds
Default Value
critical:70.0, warning:50.0
Unit(s)
PERCENT

Host Monitor Heap Dump Directory Free Space

This Host Monitor health test checks that the filesystem containing the heap dump directory of this Host Monitor 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 Host Monitor monitoring settings.

Short Name: Heap Dump Directory Free Space

Heap Dump Directory Free Space Monitoring Absolute Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's heap dump directory.
Template Name
heap_dump_directory_free_space_absolute_thresholds
Default Value
critical:5.36870912E9, warning:1.073741824E10
Unit(s)
BYTES

Heap Dump Directory Free Space Monitoring Percentage Thresholds

Description
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.
Template Name
heap_dump_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

Host Monitor Host Health

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

Short Name: Host Health

Host Monitor Host Health Test

Description
When computing the overall Host Monitor health, consider the host's health.
Template Name
hostmonitor_host_health_enabled
Default Value
true
Unit(s)
no unit

Host Monitor Host Monitor Storage Directory Free Space

This is a Host Monitor health test that checks that the filesystem containing the Host Monitor Storage Directory of this Host Monitor has sufficient free space. See the Host Monitor Storage Directory description on the Host Monitor configuration page for more information on this directory type. This test can be configured using the Host Monitor Storage Directory Free Space Monitoring Absolute Thresholds and Host Monitor Storage Directory Free Space Monitoring Percentage Thresholds Host Monitor monitoring settings.

Short Name: Host Monitor Storage Directory Free Space

Host Monitor Storage Directory Free Space Monitoring Absolute Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's Host Monitor Storage Directory.
Template Name
firehose_storage_directory_free_space_absolute_thresholds
Default Value
critical:5.36870912E9, warning:1.073741824E10
Unit(s)
BYTES

Host Monitor Storage Directory Free Space Monitoring Percentage Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's Host Monitor Storage Directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Host Monitor Storage Directory Free Space Monitoring Absolute Thresholds setting is configured.
Template Name
firehose_storage_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

Host Monitor Host Pipeline

This Host Monitor health test checks that no messages are being dropped by the host stage of the Host Monitor pipeline. A failure of this health test indicates a problem with the Host Monitor. This may indicate a configuration problem or a bug in the Host Monitor. This test can be configured using the Host Monitor Host Pipeline Monitoring Time Period monitoring setting.

Short Name: Host Pipeline

Host Monitor Host Pipeline Monitoring Thresholds

Description
The health test thresholds for monitoring the Host Monitor host pipeline. This specifies the number of dropped messages that will be tolerated over the monitoring time period.
Template Name
hostmonitor_host_pipeline_thresholds
Default Value
critical:any, warning:never
Unit(s)
no unit

Host Monitor Host Pipeline Monitoring Time Period

Description
The time period over which the Host Monitor host pipeline will be monitored for dropped messages.
Template Name
hostmonitor_host_pipeline_window
Default Value
5
Unit(s)
MINUTES

Host Monitor Log Directory Free Space

This Host Monitor health test checks that the filesystem containing the log directory of this Host Monitor 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 Host Monitor monitoring settings.

Short Name: Log Directory Free Space

Log Directory Free Space Monitoring Absolute Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory.
Template Name
log_directory_free_space_absolute_thresholds
Default Value
critical:5.36870912E9, warning:1.073741824E10
Unit(s)
BYTES

Log Directory Free Space Monitoring Percentage Thresholds

Description
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.
Template Name
log_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

Host Monitor Metrics Aggregation Run Duration Test

This is a Host Monitor health test that checks whether Cloudera Manager's aggregation run durations are within the thresholds. If the test fails, Host Monitor operation may be impacted because the Host Monitor is not able to process the metrics fast enough. This test can be configured using the Metrics Aggregation Run Duration Thresholds Cloudera Manager Host Monitor setting.

Short Name: Metrics Aggregation Run Duration Test

Metrics Aggregation Run Duration Thresholds

Description
The health test thresholds for monitoring the metrics aggregation run duration.
Template Name
aggregation_run_duration_thresholds
Default Value
critical:30000.0, warning:10000.0
Unit(s)
MILLISECONDS

Host Monitor Pause Duration

This Host Monitor health test checks that the Host Monitor threads are not experiencing long scheduling pauses. The test uses a pause monitoring thread in the Host Monitor that tracks scheduling delay by noting if it is run on its requested schedule. If the thread is not run on its requested schedule, the delay is noted and considered pause time. The health test checks that no more than some percentage of recent time is spent paused. A failure of this health test may indicate that the Host Monitor is not getting enough CPU resources, or that it is spending too much time doing garbage collection. Inspect the Host Monitor logs for any pause monitor output and check garbage collection metrics exposed by the Host Monitor. This test can be configured using the Pause Duration Thresholds and Pause Duration Monitoring Period Host Monitor monitoring settings.

Short Name: Pause Duration

Pause Duration Monitoring Period

Description
The period to review when computing the moving average of extra time the pause monitor spent paused.
Template Name
hostmonitor_pause_duration_window
Default Value
5
Unit(s)
MINUTES

Pause Duration Thresholds

Description
The health test thresholds for the weighted average extra time the pause monitor spent paused. Specified as a percentage of elapsed wall clock time.
Template Name
hostmonitor_pause_duration_thresholds
Default Value
critical:60.0, warning:30.0
Unit(s)
no unit

Host Monitor Process Status

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

Short Name: Process Status

Host Monitor Process Health Test

Description
Enables the health test that the Host Monitor's process state is consistent with the role configuration
Template Name
hostmonitor_scm_health_enabled
Default Value
true
Unit(s)
no unit

Host Monitor Swap Memory Usage

This Host Monitor 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

Process Swap Memory Thresholds

Description
The health test thresholds on the swap memory usage of the process. This takes precedence over the host level threshold.
Template Name
process_swap_memory_thresholds
Default Value
critical:never, warning:200.0
Unit(s)
BYTES

Host Monitor Unexpected Exits

This Host Monitor health test checks that the Host Monitor 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 Host Monitor monitoring settings.

Short Name: Unexpected Exits

Unexpected Exits Monitoring Period

Description
The period to review when computing unexpected exits.
Template Name
unexpected_exits_window
Default Value
5
Unit(s)
MINUTES

Unexpected Exits Thresholds

Description
The health test thresholds for unexpected exits encountered within a recent period specified by the unexpected_exits_window configuration for the role.
Template Name
unexpected_exits_thresholds
Default Value
critical:any, warning:never
Unit(s)
no unit

Host Monitor 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 Host Monitor, a misconfiguration of the Host Monitor, or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the Host Monitor for more detail. If the test failure message indicates a communication problem, the Cloudera Manager Agent's HTTP requests to the Host Monitor's web server are failing or timing out. If the test's failure message indicates an unexpected response, the Host Monitor'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 Host Monitor monitoring setting.

Short Name: Web Server Status

Web Metric Collection

Description
Enables the health test that the Cloudera Manager Agent can successfully contact and gather metrics from the web server.
Template Name
hostmonitor_web_metric_collection_enabled
Default Value
true
Unit(s)
no unit

Web Metric Collection Duration

Description
The health test thresholds on the duration of the metrics request to the web server.
Template Name
hostmonitor_web_metric_collection_thresholds
Default Value
critical:never, warning:10000.0
Unit(s)
MILLISECONDS