Host Monitor Health Tests

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

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.	hostmonitor_fd_thresholds	critical:70.0, warning:50.0	PERCENT

Host Monitor GC Duration

This Host Monitor health test checks that the Host Monitor 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 Host Monitor. This test can be configured using the Garbage Collection Duration Thresholds and Garbage Collection Duration Monitoring Period Host Monitor 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.	hostmonitor_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.	hostmonitor_gc_duration_thresholds	critical:60.0, warning:30.0	no unit

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

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

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

Property Name	Description	Template Name	Default Value	Unit
Host Monitor Host Pipeline Monitoring Thresholds	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.	hostmonitor_host_pipeline_thresholds	critical:any, warning:never	no unit
Host Monitor Host Pipeline Monitoring Time Period	The time period over which the Host Monitor host pipeline will be monitored for dropped messages.	hostmonitor_host_pipeline_window	5	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

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

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

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

Host Monitor Storage Directory Free Space

This is a Host Monitor health test that checks that the filesystem containing the data storage directory of this Host Monitor has sufficient free space. This test can be configured using the Storage Directory Free Space Monitoring Absolute Thresholds and Storage Directory Free Space Monitoring Percentage Thresholds Host Monitor monitoring settings.

Short Name: Storage Directory Free Space

Property Name	Description	Template Name	Default Value	Unit
Storage Directory Free Space Monitoring Absolute Thresholds	The health test thresholds for monitoring of free space on the filesystem that contains the storage directory.	firehose_storage_directory_free_space_absolute_thresholds	critical:5.36870912E9, warning:1.073741824E10	BYTES
Storage Directory Free Space Monitoring Percentage Thresholds	The health test thresholds for monitoring of free space on the filesystem that contains the storage directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Storage Directory Free Space Monitoring Absolute Thresholds setting is configured.	firehose_storage_directory_free_space_percentage_thresholds	critical:never, warning:never	PERCENT

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 goes above a critical threshold. For example, if this test is configured with a critical threshold of 1, this test would return "Good" health if there have been no unexpected exits recently. If there has been 1 or more unexpected exits recently, this test would return "Bad" health. This test can be configured using the Unexpected Exits Thresholds and Unexpected Exits Monitoring Period Host Monitor 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

Host Monitor Web Server Status

This Host Monitor health test checks that the web server of the Host Monitor is responding quickly to requests by the Cloudera Manager Agent, and that the Cloudera Manager Agent can collect metrics from the web server. A 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's failure message indicates a communication problem, this means that the Cloudera Manager Agent's HTTP requests to the Host Monitor's web server are failing or timing out. These requests are completely local to the Host Monitor's host, and so should never fail under normal conditions. If the test's failure message indicates an unexpected response, then the Host Monitor's web server responded to the Cloudera Manager Agent's request, but the Cloudera Manager Agent could not interpret the response for some reason. This test can be configured using the Web Metric Collection Host Monitor 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.	hostmonitor_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.	hostmonitor_web_metric_collection_thresholds	critical:never, warning:10000.0	MILLISECONDS