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

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-7285
• Component/s: datanode, namenode
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Uma Maheswara Rao G
• Created: 13/May/15 10:47
• Updated: 30/Sep/15 19:38
• Resolved: 14/May/15 15:38

Description

Currently NN will pick the (maxStreams-XmitsCount) number of ECtasks at a time for assigning to the respective DN.

//get datanode commands
      final int maxTransfer = blockManager.getMaxReplicationStreams()
          - xmitsInProgress;

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.