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https://issues.apache.org/jira/browse/HDFS-7613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14517015#comment-14517015
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Junping Du commented on HDFS-7613:
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Thanks [~zhz], the multi-policies implementation here sounds reasonable to me.
Some quick questions:
do we want DFS_BLOCK_PLACEMENT_EC_CLASSNAME_DEFAULT to be
BlockPlacementPolicyEC rather than BlockPlacementPolicyDefault? I didn't check
details of BlockPlacementPolicyEC, not sure if BlockPlacementPolicyDefault can
meet all cases that BlockPlacementPolicyEC should be there.
Also, I see BlockPlacementPolicyEC support rack layer only, do we have plan to
support NodeGroup layer as well? It would be great to make EC can be suitable
for broader scenarios.
> 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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