[jira] [Updated] (IGNITE-9679) Document critical workers liveness checking implementation

["Andrey Kuznetsov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-9679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey Kuznetsov updated IGNITE-9679:
-------------------------------------
    Description: 
Newly implemented critical worker thread liveness checks should be mentioned in Ignite Documentation. Brief description of the functionality follows.

Ignite node has a number of critical worker threads that should be alive and responsive, otherwise node's health is not guaranteed. These threads monitor each other periodically and track two aspects for a thread being checked:
- whether it's alive;
- whether it updates its internal heartbeat timestamp.
Whenever at least one of the above conditions is violated, checker thread logs the error and calls currently configured {{FailureHandler}}.

{{IgniteConfiguration.SystemWorkerBlockedTimeout}} configuration property affects monitoring behavior. At runtime monitoring settings can be changed via {{FailureHandlingMxBean}}.

By default, liveness checks are enabled, but blocked system worker detection will not lead to failure handler invocation, see {{FailureProcessor#getDefaultFailureHandler}} .


  was:
Newly implemented critical worker thread liveness checks should be mentioned in Ignite Documentation. Brief description of the functionality follows.

Ignite node has a number of critical worker threads that should be alive and responsive, otherwise node's health is not guaranteed. These threads monitor each other periodically and track two aspects for a thread being checked:
- whether it's alive;
- whether it updates its internal heartbeat timestamp.
Both checks use {{IgniteConfiguration.failureDetectionTimeout}} property as a threshold value.
Whenever at least one of the above conditions is violated, checker thread logs the error and calls currently configured {{FailureHandler}}.

Liveness checks are enabled by default, but can be disabled through {{WorkersControlMXBean.healthMonitoringEnabled}} property.



> Document critical workers liveness checking implementation
> ----------------------------------------------------------
>
>                 Key: IGNITE-9679
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9679
>             Project: Ignite
>          Issue Type: Task
>          Components: documentation
>            Reporter: Andrey Kuznetsov
>            Priority: Major
>             Fix For: 2.7
>
>
> Newly implemented critical worker thread liveness checks should be mentioned in Ignite Documentation. Brief description of the functionality follows.
> Ignite node has a number of critical worker threads that should be alive and responsive, otherwise node's health is not guaranteed. These threads monitor each other periodically and track two aspects for a thread being checked:
> - whether it's alive;
> - whether it updates its internal heartbeat timestamp.
> Whenever at least one of the above conditions is violated, checker thread logs the error and calls currently configured {{FailureHandler}}.
> {{IgniteConfiguration.SystemWorkerBlockedTimeout}} configuration property affects monitoring behavior. At runtime monitoring settings can be changed via {{FailureHandlingMxBean}}.
> By default, liveness checks are enabled, but blocked system worker detection will not lead to failure handler invocation, see {{FailureProcessor#getDefaultFailureHandler}} .



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