[jira] [Created] (HDFS-8391) NN should consider current EC tasks handling count from DN while assigning new tasks

[Uma Maheswara Rao G (JIRA)]

Uma Maheswara Rao G created HDFS-8391:
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             Summary: 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


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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