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https://issues.apache.org/jira/browse/HDFS-11293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813069#comment-15813069
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Uma Maheswara Rao G commented on HDFS-11293:
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I have just committed this to branch.
Thanks [~yuanbo] and [~rakeshr] for reviews!
Thanks [~yuanbo] for finding issue and sharing test cases.
> [SPS]: Local DN should be given preference as source node, when target
> available in same node
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-11293
> URL: https://issues.apache.org/jira/browse/HDFS-11293
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS-10285
> Reporter: Yuanbo Liu
> Assignee: Uma Maheswara Rao G
> Priority: Critical
> Attachments: HDFS-11293-HDFS-10285-00.patch,
> HDFS-11293-HDFS-10285-01.patch, HDFS-11293-HDFS-10285-02.patch
>
>
> In {{FsDatasetImpl#createTemporary}}, we use {{volumeMap}} to get replica
> info by block pool id. But in this situation:
> {code}
> datanode A => {DISK, SSD}, datanode B => {DISK, ARCHIVE}.
> 1. the same block replica exists in A[DISK] and B[DISK].
> 2. the block pool id of datanode A and datanode B are the same.
> {code}
> Then we start to change the file's storage policy and move the block replica
> in the cluster. Very likely we have to move block from B[DISK] to A[SSD], at
> this time, datanode A throws ReplicaAlreadyExistsException.
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