Impala Catalog Server Health Tests

Impala Catalog Server File Descriptors

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

Impala Catalog Server Host Health

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

Short Name: Host Health

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

Impala Catalog Server Log Directory Free Space

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

Impala Catalog Server Process Status

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

Short Name: Process Status

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

Impala Catalog Server Resident Set Size

This Impala Catalog Server health test checks that the size of the resident set does not rise above a configured threshold value. A failure of this health test may indicates that the Impala Catalog Server process is consuming more memory than expected. It is possible that that unexpected memory consumption may lead to swapping and decreased performance for processes running on the same host as this Impala Catalog Server. Increased Impala Catalog Server memory consumption may be caused by an increased workload on the Impala service, or by a bug in the Impala Catalog Server software. To avoid failures of this health test, free up additional memory for this Impala Catalog Server process and increase the Resident Set Size Thresholds monitoring setting. This test can be configured using the Resident Set Size Thresholds Impala Catalog Server monitoring setting.

Short Name: Resident Set Size

Property Name	Description	Template Name	Default Value	Unit
Resident Set Size Thresholds	The health test thresholds on the resident size of the process.	process_resident_set_size_thresholds	critical:never, warning:never	BYTES

Impala Catalog Server StateStore Connectivity

This is a Catalog Server health test that checks whether the StateStore considers the Catalog Server alive. A failure of this health test may indicate that the Catalog Server is having trouble communicating with the StateStore. Look in the Catalog Server logs for more details. This test may return an unknown result if the Service Monitor is not able to communicate with the StateStore web server. Check the status of the StateStore web server and the Service Monitor logs if this test is returning an unknown result. This test can be enabled or disabled using the Catalog Server Connectivity Health Test Catalog Server monitoring setting. The Catalog Server Connectivity Tolerance at Startup Catalog Server monitoring setting and the Health Check Startup Tolerance StateStore monitoring setting can be used to control the test's tolerance windows around Catalog Server and StateStore restarts respectively.

Short Name: StateStore Connectivity

Property Name	Description	Template Name	Default Value	Unit
Catalog Server Connectivity Health Test	Enables the health test that verifies the Catalog Server is connected to the StateStore	catalogserver_connectivity_health_enabled	true	no unit
Catalog Server Connectivity Tolerance at Startup	The amount of time to wait for the Catalog Server to fully start up and connect to the StateStore before enforcing the connectivity check.	catalogserver_connectivity_tolerance	180	SECONDS
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.	statestore_startup_tolerance	5	MINUTES

Impala Catalog Server Unexpected Exits

This Impala Catalog Server health test checks that the Impala Catalog 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 Impala Catalog 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

Impala Catalog Server Web Server Status

This Impala Catalog Server health test checks that the web server of the Impala Catalog Server 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 Impala Catalog Server, a misconfiguration of the Impala Catalog Server or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the Impala Catalog Server 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 Impala Catalog Server's web server are failing or timing out. These requests are completely local to the Impala Catalog Server's host, and so should never fail under normal conditions. If the test's failure message indicates an unexpected response, then the Impala Catalog Server'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 Impala Catalog Server 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.	catalogserver_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.	catalogserver_web_metric_collection_thresholds	critical:never, warning:10000.0	MILLISECONDS