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https://issues.apache.org/jira/browse/HADOOP-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720007#action_12720007
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Hemanth Yamijala commented on HADOOP-5478:
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bq. when the health check fails to report status to TT, try to do a "kill -9"
for the TT ...
Hong, is this to check if the TT is alive ? In which case, did you mean another
signal, like -0 or kill -3. -9 is SIGKILL and would kill the TT. Also, in that
case are you suggesting that we could keep the health checker around and
continue trying to report after a while ?
> 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
> Assignee: Vinod K V
> Attachments: hadoop-5478-1.patch, hadoop-5478-2.patch,
> hadoop-5478-3.patch
>
>
> 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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