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From "Bhallamudi Venkata Siva Kamesh (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3178) Capacity Schedular shows incorrect cluster information in the RM logs
Date Thu, 13 Oct 2011 14:28:12 GMT
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: contrib/capacity-sched
    Affects Versions: 0.24.0
            Reporter: Bhallamudi Venkata Siva Kamesh

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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