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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8391) NN should consider current EC tasks handling count from DN while assigning new tasks
Date Wed, 30 Sep 2015 16:38:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937576#comment-14937576
] 

Hudson commented on HDFS-8391:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #1203 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1203/])
HDFS-8391. NN should consider current EC tasks handling count from DN (zhezhang: rev c99c3379282779e11ebda88d845bb89407f2f350)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/erasurecode/ErasureCodingWorker.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt


> 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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