This is the documentation for Cloudera Enterprise 5.8.x. Documentation for other versions is available at Cloudera Documentation.

RegionServer Health Tests

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 Check 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

Property Name Description Template Name Default Value Unit
HBase Region Server Connectivity Tolerance at Startup 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. regionserver_connectivity_tolerance 180 SECONDS
HBase RegionServer to Master Connectivity Test Enables the health test that the RegionServer is connected to the Master regionserver_master_connectivity_enabled true no 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. master_startup_tolerance 5 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

Property Name Description Template Name Default Value Unit
HBase RegionServer Compaction Queue Monitoring Period The period over which to compute the moving average of the compaction queue size. regionserver_compaction_queue_window 5 MINUTES
HBase RegionServer Compaction Queue Monitoring Thresholds 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. regionserver_compaction_queue_thresholds critical:never, warning:10.0 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

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. regionserver_fd_thresholds critical:70.0, warning:50.0 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

Property Name Description Template Name Default Value Unit
HBase RegionServer Flush Queue Monitoring Period The period over which to compute the moving average of the flush queue size. regionserver_flush_queue_window 5 MINUTES
HBase RegionServer Flush Queue Monitoring Thresholds 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. regionserver_flush_queue_thresholds critical:never, warning:10.0 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

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. regionserver_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. regionserver_gc_duration_thresholds critical:60.0, warning:30.0 no unit

RegionServer HDFS Read Latency

This is a RegionServer health test that checks that the average time it takes for the RegionServer to read from HDFS does not exceed some value. The health test computes a moving average of the average HDFS read time for the RegionServer over a configurable window and then compares that moving average to a configured threshold value. A moving average is used to avoid alerting on short-lived HDFS read latency spikes. The behavior of this health test depends on how the HBase cluster is being used. A failure of this health test may indicate a problem with HDFS, extensive load on the cluster, or a capacity management problem. For example, it is possible to see average read latency increase while executing MapReduce jobs on the cluster. In such situations, if the read latency increase is unacceptable, consider running the MapReduce jobs with fewer map or reduce slots. This test can be configured using the HBase RegionServer HDFS Read Latency Thresholds and HBase RegionServer HDFS Read Latency Monitoring Period RegionServer monitoring settings.

Short Name: HDFS Read Latency

Property Name Description Template Name Default Value Unit
HBase RegionServer HDFS Read Latency Monitoring Period The period over which to compute the moving average of the HDFS read latency of the HBase RegionServer. regionserver_read_latency_window 5 MINUTES
HBase RegionServer HDFS Read Latency Thresholds The health test thresholds of the latency that the RegionServer sees for HDFS read operations regionserver_read_latency_thresholds critical:100.0, warning:50.0 MILLISECONDS

RegionServer HDFS Sync Latency

This is a RegionServer health test that checks that the average time it takes for the RegionServer to perform HDFS syncs does not exceed some value. The health test computes a moving average of the average HDFS sync time for the RegionServer over a configurable window and then compares that moving average to a configured threshold value. A moving average is used to avoid alerting on short-lived HDFS sync latency spikes. The behavior of this health test depends on how the HBase cluster is being used. A failure of this health test may indicate a problem with HDFS, extensive load on the cluster, or a capacity management problem. For example, it is possible to see average sync latency increase while executing MapReduce jobs on the cluster. In such situations, if the sync latency increase is unacceptable, consider running the MapReduce jobs with fewer map or reduce slots. This test can be configured using the HBase RegionServer HDFS Sync Latency Thresholds and HBase RegionServer HDFS Sync Latency Monitoring Period RegionServer monitoring settings.

Short Name: HDFS Sync Latency

Property Name Description Template Name Default Value Unit
HBase RegionServer HDFS Sync Latency Monitoring Period The period over which to compute the moving average of the HDFS sync latency of the HBase RegionServer. regionserver_sync_latency_window 5 MINUTES
HBase RegionServer HDFS Sync Latency Thresholds The health test thresholds for the latency of HDFS write operations that the RegionServer detects regionserver_sync_latency_thresholds critical:5000.0, warning:500.0 MILLISECONDS

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

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

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

Property Name Description Template Name Default Value Unit
RegionServer Host Health Test When computing the overall RegionServer health, consider the host's health. regionserver_host_health_enabled true 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

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

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

Property Name Description Template Name Default Value Unit
HBase RegionServer Memstore Size Thresholds 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. regionserver_memstore_size_thresholds critical:100.0, warning:95.0 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

Property Name Description Template Name Default Value Unit
RegionServer Process Health Test Enables the health test that the RegionServer's process state is consistent with the role configuration regionserver_scm_health_enabled true 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

Property Name Description Template Name Default Value Unit
Percentage of Heap Used by HStoreFile Index The health test thresholds of the size used by the HStoreFile index. Specified as a percentage of the total heap size. regionserver_store_file_idx_size_thresholds critical:never, warning:10.0 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

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

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

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

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

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. regionserver_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. regionserver_web_metric_collection_thresholds critical:never, warning:10000.0 MILLISECONDS
Page generated July 8, 2016.