NodeManager Health Tests

NodeManager File Descriptors

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

NodeManager GC Duration

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

NodeManager Heap Dump Directory Free Space

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

NodeManager Host Health

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

Short Name: Host Health

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

NodeManager Log Directory Free Space

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

NodeManager NodeManager Local Directories Free Space

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

Short Name: NodeManager Local Directories Free Space

Property Name Description Template Name Default Value Unit
NodeManager Local Directories Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's List of directories on the local filesystem where a NodeManager stores intermediate data files.. nodemanager_local_data_directories_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
NodeManager Local Directories Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's List of directories on the local filesystem where a NodeManager stores intermediate data files.. Specified as a percentage of the capacity on that filesystem. This setting is not used if a List of directories on the local filesystem where a NodeManager stores intermediate data files. Free Space Monitoring Absolute Thresholds setting is configured. nodemanager_local_data_directories_free_space_percentage_thresholds critical:never, warning:never PERCENT

NodeManager NodeManager Recovery Directory Free Space

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

Short Name: NodeManager Recovery Directory Free Space

Property Name Description Template Name Default Value Unit
NodeManager Recovery Directory Free Space Monitoring Absolute Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's The local filesystem directory in which the NodeManager stores state when recovery is enabled. Recovery is enabled by default.. nodemanager_recovery_directory_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
NodeManager Recovery Directory Free Space Monitoring Percentage Thresholds The health test thresholds for monitoring of free space on the filesystem that contains this role's The local filesystem directory in which the NodeManager stores state when recovery is enabled. Recovery is enabled by default.. Specified as a percentage of the capacity on that filesystem. This setting is not used if a The local filesystem directory in which the NodeManager stores state when recovery is enabled. Recovery is enabled by default. Free Space Monitoring Absolute Thresholds setting is configured. nodemanager_recovery_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

NodeManager Process Status

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

Short Name: Process Status

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

NodeManager ResourceManager Connectivity

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

Short Name: ResourceManager 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. resourcemanager_startup_tolerance_minutes 5 MINUTES
NodeManager Connectivity Health Check Enables the health check that verifies the NodeManager is connected to the ResourceManager nodemanager_connectivity_health_enabled true no unit
NodeManager Connectivity Tolerance at Startup The amount of time to wait for the NodeManager to fully start up and connect to the ResourceManager before enforcing the connectivity check. nodemanager_connectivity_tolerance_seconds 180 SECONDS

NodeManager Swap Memory Usage

This NodeManager 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

NodeManager Unexpected Exits

This NodeManager health test checks that the NodeManager 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 NodeManager 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

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