RegionServer Health Tests

RegionServer Audit Pipeline Test

This RegionServer health test checks that the Auditing for the RegionServer role is getting processed correctly and is not blocked. A failure of this health test may indicate a problem with the audit pipeline of RegionServer process. This test can fail either because the Cloudera Audit Server is not accepting audits, or the Cloudera Manager Agent on the RegionServer host isn't able to send audits because of some network issue. Check the Cloudera Manager Agent logs and Cloudera Audit Server logs for more details. This test can be enabled or disabled using the Navigator Audit Pipeline Health Check RegionServer monitoring setting.

Short Name: Audit Pipeline Test

Monitoring Period For Audit Failures

Description
The period to review when checking if audits are blocked and not getting processed.
Template Name
mgmt_navigator_failure_window
Default Value
20
Unit(s)
MINUTES

Navigator Audit Failure Thresholds

Description
The health test thresholds for failures encountered when monitoring audits within a recent period specified by the mgmt_navigator_failure_window configuration for the role. The value that can be specified for this threshold is the number of bytes of audits data that is left to be sent to audit server.
Template Name
mgmt_navigator_failure_thresholds
Default Value
critical:any, warning:never
Unit(s)
BYTES

Navigator Audit Pipeline Health Check

Description
Enable test of audit events processing pipeline. This will test if audit events are not getting processed by Audit Server for a role that generates audit.
Template Name
mgmt_navigator_status_check_enabled
Default Value
true
Unit(s)
no unit

RegionServer Cluster Connectivity

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

Short Name: Cluster Connectivity

HBase Region Server Connectivity Tolerance at Startup

Description
The amount of time to wait for the HBase Region Server to fully start up and connect to the HBase Master before enforcing the connectivity check.
Template Name
regionserver_connectivity_tolerance
Default Value
180
Unit(s)
SECONDS

HBase RegionServer to Master Connectivity Test

Description
Enables the health test that the RegionServer is connected to the Master
Template Name
regionserver_master_connectivity_enabled
Default Value
true
Unit(s)
no unit

Health Test Startup Tolerance

Description
The amount of time allowed after this role is started that failures of health tests that rely on communication with this role will be tolerated.
Template Name
master_startup_tolerance
Default Value
5
Unit(s)
MINUTES

RegionServer Compaction Queue Size

This is a RegionServer health test that checks that a moving average of the size of the RegionServer's compaction queue does not exceed some value. A failure of this health test indicates a high write load on the RegionServer. Try reducing the write load on the RegionServer, increasing capacity by adding additional disks to the RegionServer, or adding additional RegionServers. This test can be configured using the HBase RegionServer Compaction Queue Monitoring Thresholds and HBase RegionServer Compaction Queue Monitoring Period RegionServer monitoring settings.

Short Name: Compaction Queue Size

HBase RegionServer Compaction Queue Monitoring Period

Description
The period over which to compute the moving average of the compaction queue size.
Template Name
regionserver_compaction_queue_window
Default Value
5
Unit(s)
MINUTES

HBase RegionServer Compaction Queue Monitoring Thresholds

Description
The health test thresholds of the weighted average size of the HBase RegionServer compaction queue over a recent period. See HBase RegionServer Compaction Queue Monitoring Period.
Template Name
regionserver_compaction_queue_thresholds
Default Value
critical:never, warning:10.0
Unit(s)
no unit

RegionServer File Descriptors

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

Short Name: File Descriptors

File Descriptor Monitoring Thresholds

Description
The health test thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit.
Template Name
regionserver_fd_thresholds
Default Value
critical:70.0, warning:50.0
Unit(s)
PERCENT

RegionServer Flush Queue Size

This is a RegionServer health test that checks that a moving average of the size of the RegionServer's flush queue does not exceed some value. A failure of this health test indicates a high write load on the RegionServer. Try reducing the write load on the RegionServer, increasing capacity by adding additional disks to the RegionServer, or adding additional RegionServers. This test can be configured using the HBase RegionServer Flush Queue Monitoring Thresholds and HBase RegionServer Flush Queue Monitoring Period RegionServer monitoring settings.

Short Name: Flush Queue Size

HBase RegionServer Flush Queue Monitoring Period

Description
The period over which to compute the moving average of the flush queue size.
Template Name
regionserver_flush_queue_window
Default Value
5
Unit(s)
MINUTES

HBase RegionServer Flush Queue Monitoring Thresholds

Description
The health test thresholds of the average size of the HBase RegionServer flush queue over a recent period. See HBase RegionServer Flush Queue Monitoring Period.
Template Name
regionserver_flush_queue_thresholds
Default Value
critical:never, warning:10.0
Unit(s)
no unit

RegionServer GC Duration

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

Short Name: GC Duration

Garbage Collection Duration Monitoring Period

Description
The period to review when computing the moving average of garbage collection time.
Template Name
regionserver_gc_duration_window
Default Value
5
Unit(s)
MINUTES

Garbage Collection Duration Thresholds

Description
The health test thresholds for the weighted average time spent in Java garbage collection. Specified as a percentage of elapsed wall clock time.
Template Name
regionserver_gc_duration_thresholds
Default Value
critical:60.0, warning:30.0
Unit(s)
no unit

RegionServer Heap Dump Directory Free Space

This RegionServer health test checks that the filesystem containing the heap dump directory of this RegionServer 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 RegionServer monitoring settings.

Short Name: Heap Dump Directory Free Space

Heap Dump Directory Free Space Monitoring Absolute Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's heap dump directory.
Template Name
heap_dump_directory_free_space_absolute_thresholds
Default Value
critical:5.36870912E9, warning:1.073741824E10
Unit(s)
BYTES

Heap Dump Directory Free Space Monitoring Percentage Thresholds

Description
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.
Template Name
heap_dump_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

RegionServer Host Health

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

Short Name: Host Health

RegionServer Host Health Test

Description
When computing the overall RegionServer health, consider the host's health.
Template Name
regionserver_host_health_enabled
Default Value
true
Unit(s)
no unit

RegionServer Log Directory Free Space

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

Short Name: Log Directory Free Space

Log Directory Free Space Monitoring Absolute Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's log directory.
Template Name
log_directory_free_space_absolute_thresholds
Default Value
critical:5.36870912E9, warning:1.073741824E10
Unit(s)
BYTES

Log Directory Free Space Monitoring Percentage Thresholds

Description
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.
Template Name
log_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

RegionServer Memstore Size

This is a RegionServer health test that checks that the amount of the RegionServer's memory devoted to memstores does not exceed some percentage of the RegionServer's configured hbase.regionserver.global.memstore.upperLimit. When a RegionServer's memstores reach this maximum size, new updates are blocked while the RegionServer flushes. A failure of this health test indicates a high write load on the RegionServer. Try reducing the write load on the RegionServer, increasing capacity by adding additional disks to the RegionServer, or adding additional RegionServers. This test can be configured using the HBase RegionServer Memstore Size Thresholds RegionServer monitoring setting.

Short Name: Memstore Size

HBase RegionServer Memstore Size Thresholds

Description
The health test thresholds of the total size of RegionServer's memstores. Specified as a percentage of the configured upper limit. See Maximum Size of All Memstores in RegionServer.
Template Name
regionserver_memstore_size_thresholds
Default Value
critical:100.0, warning:95.0
Unit(s)
PERCENT

RegionServer Process Status

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

Short Name: Process Status

RegionServer Process Health Test

Description
Enables the health test that the RegionServer's process state is consistent with the role configuration
Template Name
regionserver_scm_health_enabled
Default Value
true
Unit(s)
no unit

RegionServer Store File Index Size

This is a RegionServer health test that checks that the sum of the sizes of all store file indexes does not exceed some percentage of the RegionServer's maximum heap size. A failure of this health test indicates that the RegionServer is using a significant portion of its memory for store file indexes. If the amount of memory devoted to these indexes is undesirably high, the size of indexes can be reduced by increasing the HBase block size, by using smaller key values, or by using fewer columns. Each of these choices involves trade-offs. Contact Cloudera Support for more information on this topic. This test can be configured using the Percentage of Heap Used by HStoreFile Index RegionServer monitoring setting.

Short Name: Store File Index Size

Percentage of Heap Used by HStoreFile Index

Description
The health test thresholds of the size used by the HStoreFile index. Specified as a percentage of the total heap size.
Template Name
regionserver_store_file_idx_size_thresholds
Default Value
critical:never, warning:10.0
Unit(s)
PERCENT

RegionServer Swap Memory Usage

This RegionServer 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

Process Swap Memory Thresholds

Description
The health test thresholds on the swap memory usage of the process. This takes precedence over the host level threshold.
Template Name
process_swap_memory_thresholds
Default Value
critical:never, warning:200.0
Unit(s)
BYTES

RegionServer Unexpected Exits

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

Short Name: Unexpected Exits

Unexpected Exits Monitoring Period

Description
The period to review when computing unexpected exits.
Template Name
unexpected_exits_window
Default Value
5
Unit(s)
MINUTES

Unexpected Exits Thresholds

Description
The health test thresholds for unexpected exits encountered within a recent period specified by the unexpected_exits_window configuration for the role.
Template Name
unexpected_exits_thresholds
Default Value
critical:any, warning:never
Unit(s)
no unit

RegionServer 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 RegionServer, a misconfiguration of the RegionServer, or a problem with the Cloudera Manager Agent. Consult the Cloudera Manager Agent logs and the logs of the RegionServer for more detail. If the test failure message indicates a communication problem, the Cloudera Manager Agent's HTTP requests to the RegionServer's web server are failing or timing out. If the test's failure message indicates an unexpected response, the RegionServer'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 RegionServer monitoring setting.

Short Name: Web Server Status

Web Metric Collection

Description
Enables the health test that the Cloudera Manager Agent can successfully contact and gather metrics from the web server.
Template Name
regionserver_web_metric_collection_enabled
Default Value
true
Unit(s)
no unit

Web Metric Collection Duration

Description
The health test thresholds on the duration of the metrics request to the web server.
Template Name
regionserver_web_metric_collection_thresholds
Default Value
critical:never, warning:10000.0
Unit(s)
MILLISECONDS