Host Monitor Health Checks
Host Monitor File Descriptors
This Host Monitor health check checks that the number of file descriptors used does not rise above some percentage of the Host Monitor file descriptor limit. A failure of this health check may indicate a bug in either Hadoop or Cloudera Manager. Contact Cloudera support. This test can be configured using the File Descriptor Monitoring Thresholds Host Monitor monitoring setting.
Short Name: File Descriptors
Property Name | Description | Template Name | Default Value | Unit |
---|---|---|---|---|
File Descriptor Monitoring Thresholds | The health check thresholds of the number of file descriptors used. Specified as a percentage of file descriptor limit. | hostmonitor_fd_thresholds | critical:70.000000, warning:50.000000 | PERCENT |
Host Monitor Host Health
This Host Monitor health check factors in the health of the host upon which the Host Monitor is running. A failure of this check means that the host running the Host Monitor is experiencing some problem. See that host's status page for more details.This test can be enabled or disabled using the Host Monitor Host Health Check Host Monitor monitoring setting.
Short Name: Host Health
Property Name | Description | Template Name | Default Value | Unit |
---|---|---|---|---|
Host Monitor Host Health Check | When computing the overall Host Monitor health, consider the host's health. | hostmonitor_host_health_enabled | true | no unit |
Host Monitor Host Pipeline
This Host Monitor health check checks that no messages are being dropped by the host stage of the Host Monitor pipeline. A failure of this health check indicates a problem with the Host Monitor. This may indicate a configuration problem or a bug in the Host Monitor. This test can be configured using the Host Monitor Host Pipeline Monitoring Time Period monitoring setting.
Short Name: Host Pipeline
Property Name | Description | Template Name | Default Value | Unit |
---|---|---|---|---|
Host Monitor Host Pipeline Monitoring Thresholds | The health check thresholds for monitoring the Host Monitor host pipeline. This specifies the number of dropped messages that will be tolerated over the monitoring time period. | hostmonitor_host_pipeline_thresholds | critical:any, warning:never | no unit |
Host Monitor Host Pipeline Monitoring Time Period | The time period over which the Host Monitor host pipeline will be monitored for dropped messages. | hostmonitor_host_pipeline_window | 5 | MINUTES |
Host Monitor Log Directory Free Space
This Host Monitor health check checks that the filesystem containing the log directory of this Host Monitor 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 Host Monitor 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 check thresholds for monitoring of free space on the filesystem that contains this role's log directory. | log_directory_free_space_absolute_thresholds | critical:5368709120.000000, warning:10737418240.000000 | BYTES |
Log Directory Free Space Monitoring Percentage Thresholds | The health check 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 |
Host Monitor Process Status
This Host Monitor health check checks that the Cloudera Manager Agent on the Host Monitor host is heart beating correctly and that the process associated with the Host Monitor role is in the state expected by Cloudera Manager. A failure of this health check may indicate a problem with the Host Monitor process, a lack of connectivity to the Cloudera Manager Agent on the Host Monitor host, or a problem with the Cloudera Manager Agent. This check can fail either because the Host Monitor has crashed or because the Host Monitor will not start or stop in a timely fashion. Check the Host Monitor logs for more details. If the check fails because of problems communicating with the Cloudera Manager Agent on the Host Monitor host, check the status of the Cloudera Manager Agent by running /etc/init.d/cloudera-scm-agent status on the Host Monitor host, or look in the Cloudera Manager Agent logs on the Host Monitor host for more details. This test can be enabled or disabled using the Host Monitor Process Health Check Host Monitor monitoring setting.
Short Name: Process Status
Property Name | Description | Template Name | Default Value | Unit |
---|---|---|---|---|
Host Monitor Process Health Check | Enables the health check that the Host Monitor's process state is consistent with the role configuration | hostmonitor_scm_health_enabled | true | no unit |
Host Monitor Unexpected Exits
This Host Monitor health check checks that the Host Monitor has not recently exited unexpectedly. The check returns "Bad" health if the number of unexpected exits goes above a critical threshold. For example, if this check is configured with a critical threshold of 1, this check would return "Good" health if there have been no unexpected exits recently. If there has been 1 or more unexpected exits recently, this check would return "Bad" health. This test can be configured using the Unexpected Exits Thresholds and Unexpected Exits Monitoring Period Host Monitor 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 check 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 |
Host Monitor Web Server Status
This Host Monitor health check checks that the web server of the Host Monitor is responding quickly to requests by the Cloudera Manager agent, and that the Cloudera Manager agent can collect metrics from the web server. A failure of this health check may indicate a problem with the web server of the Host Monitor, a misconfiguration of the Host Monitor or a problem with the Cloudera Manager agent. Consult the Cloudera Manager agent logs and the logs of the Host Monitor for more detail. If the test's failure message indicates a communication problem, this means that the Cloudera Manager Agent's HTTP requests to the Host Monitor's web server are failing or timing out. These requests are completely local to the Host Monitor's host, and so should never fail under normal conditions. If the test's failure message indicates an unexpected response, then the Host Monitor's web server responded to the Cloudera Manager Agent's request, but the Cloudera Manager Agent could not interpret the response for some reason. This test can be configured using the Web Metric Collection Host Monitor monitoring setting.
Short Name: Web Server Status
Property Name | Description | Template Name | Default Value | Unit |
---|---|---|---|---|
Web Metric Collection | Enables the health check that the Cloudera Manager Agent can successfully contact and gather metrics from the web server. | hostmonitor_web_metric_collection_enabled | true | no unit |
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