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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7639) Remove the limitation imposed by dfs.balancer.moverThreads
Date Fri, 04 Mar 2016 02:28:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179177#comment-15179177
] 

John Zhuge commented on HDFS-7639:
----------------------------------

+1 Definitely wasteful to occupy a thread to send a request and wait for a response.

> Remove the limitation imposed by dfs.balancer.moverThreads
> ----------------------------------------------------------
>
>                 Key: HDFS-7639
>                 URL: https://issues.apache.org/jira/browse/HDFS-7639
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer & mover
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Kanaka Kumar Avvaru
>
> In Balancer/Mover, the number of dispatcher threads (dfs.balancer.moverThreads) limits
the number of concurrent moves.  Each dispatcher thread sends request to a datanode and then
is blocked for waiting the response.  We should remove such limitation.



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