[jira] Commented: (HADOOP-5478) Provide a node health check script and run it periodically to check the node health status

["Allen Wittenauer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700332#action_12700332 ] 

Allen Wittenauer commented on HADOOP-5478:
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We were chatting a bit about this at staff today.  One of the topics that came up was what should happen if the TaskTracker is found to be in a bad state.  The general agreement was that it should be blacklisted with the option of coming back to life.   This helps prevents transient problems from becoming permanent problems.

> Provide a node health check script and run it periodically to check the node health status
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-5478
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5478
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Aroop Maliakkal
>
> Hadoop must have some mechanism to find the health status of a node . It should run the health check script periodically and if there is any errors, it should black list the node. This will be really helpful when we run static mapred clusters. Else we may have to run some scripts/daemons periodically to find the node status and take it offline manually.

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