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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2523) ResourceManager UI showing negative value for "Decommissioned Nodes" field
Date Tue, 23 Sep 2014 17:08:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-2523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145044#comment-14145044

Jason Lowe commented on YARN-2523:

Thanks for the patch, Rohith!

It seems inconsistent that we call incrDecommissionedNMs but never call decrDecommissionedNMs,
and I think it can cause problems.  For example, if we only have the include list specified
but not an exclude list, nodes that attempt to join that are not in the include list will
go into the DECOMMISSIONED state and increment the corresponding metric, but if we later refresh
the nodes then I think we'll set the metric for decommissioned nodes to zero (because the
exclude list is still empty) but there could be a non-zero number of decommissioned nodes.

> ResourceManager UI showing negative value for "Decommissioned Nodes" field
> --------------------------------------------------------------------------
>                 Key: YARN-2523
>                 URL: https://issues.apache.org/jira/browse/YARN-2523
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, webapp
>    Affects Versions: 3.0.0
>            Reporter: Nishan Shetty
>            Assignee: Rohith
>         Attachments: YARN-2523.patch, YARN-2523.patch
> 1. Decommission one NodeManager by configuring ip in excludehost file
> 2. Remove ip from excludehost file
> 3. Execute -refreshNodes command and restart Decommissioned NodeManager
> Observe that in RM UI negative value for "Decommissioned Nodes" field is shown

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