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From "dragon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10092) CLONE - NN should consider current EC tasks handling count from DN while assigning new tasks
Date Tue, 15 Mar 2016 08:16:36 GMT
dragon created HDFS-10092:
-----------------------------

             Summary: CLONE - NN should consider current EC tasks handling count from DN while
assigning new tasks
                 Key: HDFS-10092
                 URL: https://issues.apache.org/jira/browse/HDFS-10092
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode, namenode
            Reporter: dragon
            Assignee: Uma Maheswara Rao G
             Fix For: HDFS-7285


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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