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https://issues.apache.org/jira/browse/HDFS-6700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066576#comment-14066576
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Arpit Agarwal commented on HDFS-6700:
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+1 for the patch.
One caveat - NN storage map can be temporarily inaccurate since DN volume
choosing policy overrides NN storage choice at block creation. It does not
affect this change and we should fix the creation separately.
> BlockPlacementPolicy shoud choose storage but not datanode for deletion
> -----------------------------------------------------------------------
>
> Key: HDFS-6700
> URL: https://issues.apache.org/jira/browse/HDFS-6700
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Priority: Minor
> Attachments: h6700_20140717.patch, h6700_20140717b.patch
>
>
> HDFS-2832 changed datanode storage model from a single storage, which may
> correspond to multiple physical storage medias, to a collection of storages
> with each storage corresponding to a physical storage media.
> BlockPlacementPolicy.chooseReplicaToDelete still chooses replica in term of
> DatanodeDescriptor but not DatanodeStorageInfo.
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