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

Short Name: File Descriptors

This JobTracker health test checks that the JobTracker 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 JobTracker. This test can be configured using the Garbage Collection Duration Thresholds and Garbage Collection Duration Monitoring Period JobTracker monitoring settings.

Short Name: GC Duration

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

Short Name: Host Health

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

Short Name: Log Directory Free Space

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

Short Name: Process Status

This JobTracker health test checks that the JobTracker 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 JobTracker monitoring settings.

Short Name: Unexpected Exits

This JobTracker health test checks that the web server of the JobTracker 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 JobTracker, a misconfiguration of the JobTracker or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the JobTracker 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 JobTracker's web server are failing or timing out. These requests are completely local to the JobTracker's host, and so should never fail under normal conditions. If the test's failure message indicates an unexpected response, then the JobTracker'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 JobTracker monitoring setting.

Short Name: Web Server Status