Tablet Server Health Tests

Tablet Server File Descriptors

This Tablet Server health test checks that the number of file descriptors used does not rise above some percentage of the Tablet Server 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 Tablet Server 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.	accumulo_tserver_fd_thresholds	critical:70.0, warning:50.0	PERCENT

Tablet Server Host Health

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

Short Name: Host Health

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

Tablet Server Log Directory Free Space

This Tablet Server health test checks that the filesystem containing the log directory of this Tablet Server 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 Tablet Server 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

Tablet Server Process Status

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

Short Name: Process Status

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

Tablet Server Unexpected Exits

This Tablet Server health test checks that the Tablet Server 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 Tablet Server 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