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

Short Name: Activity Monitor Pipeline

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

Short Name: Activity Tree Pipeline

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

Short Name: File Descriptors

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

Short Name: Host Health

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

Short Name: Log Directory Free Space

This Activity Monitor health test checks that the Activity Monitor threads are not experiencing long scheduling pauses. The test uses a pause monitoring thread in the Activity 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 Activity Monitor is not getting enough CPU resources, or that it is spending too much time doing garbage collection. Inspect the Activity Monitor logs for any pause monitor output and check garbage collection metrics exposed by the Activity Monitor. This test can be configured using the Pause Duration Thresholds and Pause Duration Monitoring Period Activity Monitor monitoring settings.

Short Name: Pause Duration

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

Short Name: Process Status

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

Short Name: Unexpected Exits

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. A failure of this health test may indicate a problem with the web server of the Activity Monitor, a misconfiguration of the Activity Monitor or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the Activity 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 Activity Monitor's web server are failing or timing out. If the test's failure message indicates an unexpected response, then the Activity Monitor's web server responded to the Cloudera Manager Agent's request, but the response could not interpreted for some reason. This test can be configured using the Web Metric Collection Activity Monitor monitoring setting.

Short Name: Web Server Status