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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 Thu, 18 Jun 2009 10:41:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721175#action_12721175
] 

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

+1 to hemanth's comments. 

> 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: Sreekanth Ramakrishnan
>         Attachments: active.png, blacklist1.png, cluster_setup.pdf, hadoop-5478-1.patch,
hadoop-5478-2.patch, hadoop-5478-3.patch, hadoop-5478-4.patch, hadoop-5478-5.patch, hadoop-5478-6.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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