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From "Allen Wittenauer (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 15:42:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721317#action_12721317
] 

Allen Wittenauer commented on HADOOP-5478:
------------------------------------------

bq. But the fact that we are reporting timestamps of the last health status gives the administrators
an opportunity to know that something is amiss on this node, because it's health has not been
updated for a while.

Hmm.  What interface do admins have that make this obvious?  If a cluster has 2500 TTs, it
isn't going to be obvious in a web UI that any given TT is sick.  

> 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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