TaskTracker Health Tests

TaskTracker Blacklisted Status

This is a TaskTracker health test that checks that the JobTracker has not blacklisted the TaskTracker. A failure of this health test indicates that the JobTracker has blacklisted the TaskTracker because of the failure rate of tasks on the TaskTracker is significantly higher than the average cluster failure rate. Check the TaskTracker logs for more details. This test can be enabled or disabled using the TaskTracker Blacklisted Health Test TaskTracker monitoring setting.

Short Name: Blacklisted Status

Property Name Description Template Name Default Value Unit
TaskTracker Blacklisted Health Test Enables the health test that the TaskTracker is not blacklisted tasktracker_blacklisted_health_enabled true no unit

TaskTracker File Descriptors

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

TaskTracker GC Duration

This TaskTracker health test checks that the TaskTracker 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 TaskTracker. This test can be configured using the Garbage Collection Duration Thresholds and Garbage Collection Duration Monitoring Period TaskTracker 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. tasktracker_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. tasktracker_gc_duration_thresholds critical:60.0, warning:30.0 no unit

TaskTracker Heap Dump Directory Free Space

This TaskTracker health test checks that the filesystem containing the heap dump directory of this TaskTracker 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 TaskTracker 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

TaskTracker Host Health

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

Short Name: Host Health

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

TaskTracker JobTracker Connectivity

This is a TaskTracker health test that checks whether the JobTracker considers the TaskTracker alive. A failure of this health test may indicate that the TaskTracker is having trouble communicating with the JobTracker. Look in the TaskTracker logs for more details. This test can be enabled or disabled using the TaskTracker Connectivity Health Test TaskTracker monitoring setting. The TaskTracker Connectivity Tolerance at Startup TaskTracker monitoring setting and the Health Check Startup Tolerance JobTracker monitoring setting can be used to control the test's tolerance windows around TaskTracker and JobTracker restarts respectively.

Short Name: JobTracker Connectivity

Property Name Description Template Name Default Value Unit
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. jobtracker_startup_tolerance 5 MINUTES
TaskTracker Connectivity Health Test Enables the health test that the TaskTracker is connected to the JobTracker tasktracker_connectivity_health_enabled true no unit
TaskTracker Connectivity Tolerance at Startup The amount of time to wait for the TaskTracker to fully start up and connect to the JobTracker before enforcing the connectivity check. tasktracker_connectivity_tolerance 180 SECONDS

TaskTracker Log Directory Free Space

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

TaskTracker Process Status

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

Short Name: Process Status

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

TaskTracker Swap Memory Usage

This TaskTracker 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

TaskTracker TaskTracker Local Data Directories Free Space

This is a TaskTracker health test that checks that the filesystem containing the TaskTracker Local Data Directories of this TaskTracker has sufficient free space. See the TaskTracker Local Data Directories description on the TaskTracker configuration page for more information on this directory type. This test can be configured using the TaskTracker Local Data Directories Free Space Monitoring Absolute Thresholds and TaskTracker Local Data Directories Free Space Monitoring Percentage Thresholds TaskTracker monitoring settings.

Short Name: TaskTracker Local Data Directories Free Space

Property Name Description Template Name Default Value Unit
TaskTracker Local Data Directories Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's TaskTracker Local Data Directories. tasktracker_local_data_directories_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
TaskTracker Local Data Directories Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's TaskTracker Local Data Directories. Specified as a percentage of the capacity on that filesystem. This setting is not used if a TaskTracker Local Data Directories Free Space Monitoring Absolute Thresholds setting is configured. tasktracker_local_data_directories_free_space_percentage_thresholds critical:never, warning:never PERCENT

TaskTracker Unexpected Exits

This TaskTracker health test checks that the TaskTracker 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 TaskTracker 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

TaskTracker 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 TaskTracker, a misconfiguration of the TaskTracker, or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the TaskTracker for more detail. If the test failure message indicates a communication problem, the Cloudera Manager Agent's HTTP requests to the TaskTracker's web server are failing or timing out. If the test's failure message indicates an unexpected response, the TaskTracker'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 TaskTracker 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. tasktracker_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. tasktracker_web_metric_collection_thresholds critical:never, warning:10000.0 MILLISECONDS