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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10285) Admin interface to swap callqueue at runtime
Date Thu, 27 Feb 2014 22:43:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13915139#comment-13915139
] 

Arpit Agarwal commented on HADOOP-10285:
----------------------------------------

bq. I don't think it's necessary on the datanode at this point. It doesn't hurt to restart
the datanode.
Sorry I meant this in the {{NameNodeRpcServer}} constructor.
{code}
      DFSUtil.addPBProtocol(conf, RefreshCallQueueProtocolPB.class,
          refreshCallQueueService, serviceRpcServer);
{code}
I don't think we need to accept {{refreshCallQueue}} on the {{serviceRpcServer}} port. We
can remove this line of code.

bq. Interesting idea, I also think it would be nice to have a return status on the Refresh*
calls too, because right now they're just void. Is that something we'd want done in this patch,
or a separate issue to refactor RefreshCallQueueProto into something more generic?
We can address it in a separate Jira if it makes sense, but ideally in the same release so
we don't have to support {{RefreshCallQueueProto}} forever.

Thanks for the quick response.

> Admin interface to swap callqueue at runtime
> --------------------------------------------
>
>                 Key: HADOOP-10285
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10285
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Chris Li
>         Attachments: HADOOP-10285.patch, HADOOP-10285.patch, HADOOP-10285.patch, bisection-test.patch,
bisection-test.patch, bisection-test.patch, bisection-test.patch, bisection-test.patch
>
>
> We wish to swap the active call queue during runtime in order to do performance tuning
without restarting the namenode.
> This patch adds the ability to refresh the call queue on the namenode, through dfsadmin
-refreshCallQueue



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