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https://issues.apache.org/jira/browse/HDFS-11293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HDFS-11293:
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    Summary: [SPS]: Local DN should be given prefernce as source node, when 
target available in same node  (was: [SPS] Local DN should be given prefernce 
as source node, when target available in same node)

> [SPS]: Local DN should be given prefernce 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
>            Reporter: Yuanbo Liu
>            Assignee: Yuanbo Liu
>            Priority: Critical
>         Attachments: HDFS-11293-HDFS-10285-00.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 and it's not a 
> correct behavior.



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