JobTracker Health Tests

JobTracker File Descriptors

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

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. jobtracker_fd_thresholds critical:70.0, warning:50.0 PERCENT

JobTracker GC Duration

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

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. jobtracker_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. jobtracker_gc_duration_thresholds critical:60.0, warning:30.0 no unit

JobTracker Heap Dump Directory Free Space

This JobTracker health test checks that the filesystem containing the heap dump directory of this JobTracker has sufficient free space. This test can be configured using the Heap Dump Directory Free Space Monitoring Absolute Thresholds and Heap Dump Directory Free Space Monitoring Percentage Thresholds JobTracker monitoring settings.

Short Name: Heap Dump Directory Free Space

Property Name Description Template Name Default Value Unit
Heap Dump Directory Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's heap dump directory. heap_dump_directory_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
Heap Dump Directory Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's heap dump directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Heap Dump Directory Free Space Monitoring Absolute Thresholds setting is configured. heap_dump_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

JobTracker Host Health

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

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

JobTracker Log Directory Free Space

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

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

JobTracker Process Status

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

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

JobTracker Swap Memory Usage

This JobTracker health test checks the amount of swap memory in use by the role. A failure of this health test may indicate that your machine is overloaded. This test can be configured using the Process Swap Memory Thresholds monitoring settings.

Short Name: Swap Memory Usage

Property Name Description Template Name Default Value Unit
Process Swap Memory Thresholds The health test thresholds on the swap memory usage of the process. process_swap_memory_thresholds critical:never, warning:any BYTES

JobTracker Unexpected Exits

This JobTracker health test checks that the JobTracker has not recently exited unexpectedly. The test returns "Bad" health if the number of unexpected exits exceeds a critical threshold. For example, if this test is configured with a critical threshold of 1, this test returns "Good" health if there have been no unexpected exits recently. If 1 or more unexpected exits occured recently, this test returns "Bad" health. The test also indicates whether any of the exits were caused by an OutOfMemory error if the Cloudera Manager Kill When Out of Memory monitoring setting is enabled. This test can be configured using the Unexpected Exits Thresholds and Unexpected Exits Monitoring Period JobTracker 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

JobTracker Web Server Status

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. 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 failure message indicates a communication problem, the Cloudera Manager Agent's HTTP requests to the JobTracker's web server are failing or timing out. If the test's failure message indicates an unexpected response, the JobTracker's web server responded to the Cloudera Manager Agent's request, but the response could not be interpreted for some reason. This test can be configured using the Web Metric Collection JobTracker 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. jobtracker_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. jobtracker_web_metric_collection_thresholds critical:never, warning:10000.0 MILLISECONDS