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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5478) Provide a node health check script and run it periodically to check the node health status
Date Fri, 12 Jun 2009 07:50:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718752#action_12718752
] 

Hong Tang commented on HADOOP-5478:
-----------------------------------

@owen: Steve's comments seem to imply that we need the capability of launch the health checking
script in response to external commands.

@Streekanth: If I understand correctly, the new patch introduces another thread to check for
command execution timeout. Is there a way to eliminate it (possibly by modifying shell execution
API to accept timeouts)? 

> 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 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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