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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 22:21:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13915123#comment-13915123

Arpit Agarwal commented on HADOOP-10285:

Hi Chris, a few questions unrelated to the test failure.

# {{refreshCallQueue}} calls will be accepted by both the datanode and the client RPC services.
Is the former necessary? It looks like DFSAdmin will only target the client RPC service.
# For the refresh call to work the configuration must have been modified on the server. Is
the administrator required to do so manually before calling refresh?
# Do we need separate protocols for each {{Refresh...}} call? Perhaps we can't remove existing
protocols for backwards compatibility, but going forward can we have a single protocol? What
do you think?


> 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

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