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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349949#comment-14349949
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Walter Su commented on HDFS-7613:
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a blockgroup has one blockId. Client gets blockId(blockgroup) and targets[],
and writes to this targets[]. The question is, Doesn't the blocks in these
Datanodes have the same blockId in the datanode side? How does the NN/DN know
the order in the targets[] is the same order of the Datanodes that clients
writes the files to? I looked into the comments at HDFS-7853, and still
confused.
> 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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