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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11293) [SPS]: Local DN should be given preference as source node, when target available in same node
Date Mon, 09 Jan 2017 08:42:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-11293:
---------------------------------------
    Affects Version/s: HDFS-10285

> [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
>
>
> 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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