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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493500#comment-14493500
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Kai Zheng commented on HDFS-7613:
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Just questions, is this policy intended to be used by stripping erasure coding?
So when client writes a new file in stripping, this policy will be used to
determine how to place the 6 + 3 blocks for example?
If above is true, how about non-stripping erasure coding? In that case, think
about how to select the 6 data blocks from existing, and then how to determine
to place the result 3 parity blocks? Will this policy help then or will we need
a new one?
> 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
> Attachments: HDFS-7613.001.patch
>
>
> 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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