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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, 05 Jun 2009 17:29:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716682#action_12716682
] 

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

- The health checking script may end up running more frequently than desired if the thread
gets interrupted.
- The health checking script may also run at a lower frequency as desired because the code
did not count the actual time spent on running the script. We should have a variable remember
the last launch time, and in the beginning of the loop, get the current time, and either launch
the script or sleep for the difference of the check-interval and the elapsed time since the
last launch time.
- Like Owen said, we probably need to have a timeout when executing the script (and if it
indeed happens, count it as failure).

> 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 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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