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From "Bhallamudi Venkata Siva Kamesh (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3178) Capacity Schedular shows incorrect cluster information in the RM logs
Date Fri, 14 Oct 2011 12:20:11 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bhallamudi Venkata Siva Kamesh updated MAPREDUCE-3178:

    Attachment: MAPREDUCE-3178.patch

I have attached a solution as a patch.Can be validated.
> Capacity Schedular shows incorrect cluster information in the RM logs
> ---------------------------------------------------------------------
>                 Key: MAPREDUCE-3178
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3178
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Bhallamudi Venkata Siva Kamesh
>         Attachments: MAPREDUCE-3178.patch
> When we start the NM, after stopping it (in a quick session) CS shows incorrect information
about clusterResource in the logs.
> I have encountered this issue in a pseudo cluster mode and steps to reproduce are
> 1) start the YARN cluster
> 2) stop a NM and start the NM again (in a quick session)
> There should be a NM running in the cluster however as I observed RM detects NM as dead,
after default time since its actual unavailability(In this case NM has been stopped).
> If you start your NM before this time (default time), ResourceTracker throws IOEx, however,
CS adds the NM's capacity to the clusterResource. 
> After elapsed time (default time) when RM detects NM as dead, RM removes the NM and hence
capacity of the cluster will be subtracted by the amount NM capacity.
> Eventually there is no NM running in the cluster, but capacity of the cluster is NM's
capacity (by default)

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