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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7613) Block placement policy for erasure coding groups
Date Fri, 06 Mar 2015 06:41:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350029#comment-14350029
] 

Walter Su commented on HDFS-7613:
---------------------------------

I finally got what is HDFS-7853 trying to accomplish. So client will get blockId(blockGroupId)
from NN, and write blockId+0, blockId+1, blockId+2,..,blockId+N to every datanode.

> Block placement policy for erasure coding groups
> ------------------------------------------------
>
>                 Key: HDFS-7613
>                 URL: https://issues.apache.org/jira/browse/HDFS-7613
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Walter Su
>
> Blocks in an erasure coding group should be placed in different failure domains -- different
DataNodes at the minimum, and different racks ideally.



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