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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-8391) NN should consider current EC tasks handling count from DN while assigning new tasks
Date Thu, 14 May 2015 15:39:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G resolved HDFS-8391.
---------------------------------------
       Resolution: Fixed
    Fix Version/s: HDFS-7285
     Hadoop Flags: Reviewed

> NN should consider current EC tasks handling count from DN while assigning new tasks
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-8391
>                 URL: https://issues.apache.org/jira/browse/HDFS-8391
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-8391-01.patch
>
>
> Currently NN will pick the (maxStreams-XmitsCount) number of ECtasks at a time for assigning
to the respective DN.
> {code}
> //get datanode commands
>       final int maxTransfer = blockManager.getMaxReplicationStreams()
>           - xmitsInProgress;
> {code}
> But right now we increment xmitsInProgress count at DN only for regular replication tasks
but not for ECWorker tasks.
> So, either we should treat this logic separately for EC or we should consider EC current
task handling count form DN.
> This jira for discussing more for this case.



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