ZooKeeper Server Health Tests

ZooKeeper Server Audit Pipeline Test

This Server health test checks that the Auditing for the Server role is getting processed correctly and is not blocked. A failure of this health test may indicate a problem with the audit pipeline of Server process. This test can fail either because the Cloudera Audit Server is not accepting audits, or the Cloudera Manager Agent on the Server 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 Server 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

ZooKeeper Server Connection Count

This is a ZooKeeper Server role-level health test that checks that a moving average of the ZooKeeper Server's connection count does not exceed some value. A failure of this health test indicates a high connection load on the ZooKeeper Server. This test can be configured using the ZooKeeper Server Connection Count Thresholds and ZooKeeper Server Connection Count Monitoring Period ZooKeeper Server monitoring settings.

Short Name: Connection Count

ZooKeeper Server Connection Count Monitoring Period

Description
The period to review when computing the moving average of the connection count. Specified in minutes.
Template Name
zookeeper_server_connection_count_window
Default Value
3
Unit(s)
MINUTES

ZooKeeper Server Connection Count Thresholds

Description
The health check thresholds of the weighted average size of the ZooKeeper Server connection count over a recent period. See ZooKeeper Server Connection Count Monitoring Period.
Template Name
zookeeper_server_connection_count_thresholds
Default Value
critical:never, warning:never
Unit(s)
no unit

ZooKeeper Server Data Directory Free Space

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

Short Name: Data Directory Free Space

Data Directory Free Space Monitoring Absolute Thresholds

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

Data Directory Free Space Monitoring Percentage Thresholds

Description
The health test thresholds for monitoring of free space on the filesystem that contains this role's Data Directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Data Directory Free Space Monitoring Absolute Thresholds setting is configured.
Template Name
zookeeper_server_data_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

ZooKeeper Server File Descriptors

This Server health test checks that the number of file descriptors used does not rise above some percentage of the Server 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 Server 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
zookeeper_server_fd_thresholds
Default Value
critical:70.0, warning:50.0
Unit(s)
PERCENT

ZooKeeper Server GC Duration

This Server health test checks that the Server 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 Server. This test can be configured using the Garbage Collection Duration Thresholds and Garbage Collection Duration Monitoring Period Server 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
zookeeper_server_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
zookeeper_server_gc_duration_thresholds
Default Value
critical:60.0, warning:30.0
Unit(s)
no unit

ZooKeeper Server Heap Dump Directory Free Space

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

ZooKeeper Server Host Health

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

Short Name: Host Health

Server Host Health Test

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

ZooKeeper Server Log Directory Free Space

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

ZooKeeper Server Maximum Request Latency

This is a ZooKeeper server health test that checks that the ratio of the maximum request latency to the maximum client-negotiable session timeout does not exceed some value. Note that the maximum client-negotiable timeout need not be the actual session timeout used by a client but is the upper bound of such client session timeouts. As a result, this test being in "Good" health does not preclude clients from experiencing timeouts based on the particular session timeout value they have negotiated with the server. A failure of this health test likely indicates a high load on the ZooKeeper Server. This test can be configured using the Maximum Latency Monitoring Thresholds ZooKeeper Server monitoring setting.

Short Name: Maximum Request Latency

Maximum Latency Monitoring Thresholds

Description
The percentage thresholds of the ratio of the maximum request latency to the maximum client-negotiable session timeout since the server was started.
Template Name
zookeeper_server_max_latency_thresholds
Default Value
critical:100.0, warning:75.0
Unit(s)
PERCENT

ZooKeeper Server Outstanding Requests

This is a ZooKeeper Server role-level health test that checks that a moving average of the size of the ZooKeeper Server's outstanding requests does not exceed some value. Outstanding requests are the number of queued requests in the server. It increases when the server is under load and is receiving more sustained requests than it can process. A failure of this health test indicates a high connection load on the ZooKeeper Server. This test can be configured using the ZooKeeper Server Outstanding Requests Thresholds and ZooKeeper Server Outstanding Requests Monitoring Period ZooKeeper Server monitoring settings.

Short Name: Outstanding Requests

ZooKeeper Server Outstanding Requests Monitoring Period

Description
The period to review when computing the moving average of the outstanding requests queue size. Specified in minutes.
Template Name
zookeeper_server_outstanding_requests_window
Default Value
3
Unit(s)
MINUTES

ZooKeeper Server Outstanding Requests Thresholds

Description
The health check thresholds of the weighted average size of the ZooKeeper Server outstanding requests queue over a recent period. See ZooKeeper Server Outstanding Requests Monitoring Period.
Template Name
zookeeper_server_outstanding_requests_thresholds
Default Value
critical:never, warning:never
Unit(s)
no unit

ZooKeeper Server Process Status

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

Short Name: Process Status

Server Process Health Test

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

ZooKeeper Server Quorum Membership

This is a ZooKeeper server role-level health test to verify that the server is part of a quorum. This check is disabled if the ZooKeeper Server is in standalone mode. The test returns "Concerning" health as long as the quorum membership status for the ZooKeeper Server was determined within the detection window and it is in leader election. The test returns "Bad" health if the ZooKeeper Server is not part of a quorum or the quorum status of the ZooKeeper Server could not be determined for the entire detection window. A failure of this health test may indicate a communication problem between this ZooKeeper Server and the rest of its peers or between the Cloudera Manager Service Monitor and the ZooKeeper Server. Check the ZooKeeper Server and Cloudera Manager Service Monitor logs for additional information. This test can be enabled or disabled using the Enable the Quorum Membership Check ZooKeeper Server monitoring setting. In addition, the Quorum Membership Detection Window setting can be used to adjust the time that the Cloudera Manager Service Monitor has to detect the ZooKeeper Server quorum membership status before this health test fails.

Short Name: Quorum Membership

Enable the Quorum Membership Check

Description
Enables the quorum membership check for this ZooKeeper Server.
Template Name
zookeeper_server_quorum_membership_enabled
Default Value
true
Unit(s)
no unit

Quorum Membership Detection Window

Description
The tolerance window that will be used in the detection of a ZooKeeper server's membership in a quorum. Specified in minutes.
Template Name
zookeeper_server_quorum_membership_detection_window
Default Value
3
Unit(s)
MINUTES

ZooKeeper Server Swap Memory Usage

This Server 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

ZooKeeper Server Transaction Log Directory Free Space

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

Short Name: Transaction Log Directory Free Space

Transaction 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 Transaction Log Directory.
Template Name
zookeeper_server_data_log_directory_free_space_absolute_thresholds
Default Value
critical:5.36870912E9, warning:1.073741824E10
Unit(s)
BYTES

Transaction 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 Transaction Log Directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Transaction Log Directory Free Space Monitoring Absolute Thresholds setting is configured.
Template Name
zookeeper_server_data_log_directory_free_space_percentage_thresholds
Default Value
critical:never, warning:never
Unit(s)
PERCENT

ZooKeeper Server Unexpected Exits

This Server health test checks that the Server 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 Server 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