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https://issues.apache.org/jira/browse/HDFS-8147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated HDFS-8147:
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Fix Version/s: 2.8.0
> Mover should not schedule two replicas to the same DN storage
> -------------------------------------------------------------
>
> Key: HDFS-8147
> URL: https://issues.apache.org/jira/browse/HDFS-8147
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Affects Versions: 2.6.0
> Reporter: Surendra Singh Lilhore
> Assignee: Surendra Singh Lilhore
> Fix For: 2.8.0, 2.7.1, 3.0.0-alpha1
>
> Attachments: HDFS-8147.patch, HDFS-8147_1.patch, HDFS-8147_2.patch,
> HDFS-8147_3.patch, HDFS-8147_4.patch
>
>
> *Scenario:*
> 1. Three DN cluster. For DNs storage type is like this.
> DN1 : DISK,ARCHIVE
> DN2 : DISK
> DN3 : DISK,ARCHIVE (All DNs are in same rack)
> 2. One file with two replicas (In DN1 and DN2)
> 3. Set file storage policy COLD
> 4. Now execute Mover.
> *Expected Result:* File blocks should move in DN1:ARCHIVE and DN3:ARCHIVE
> *Actual Result:* {{chooseTargetInSameNode()}} move D1:DISK block to
> D1:ARCHIVE, but in next iteration {{chooseTarget()}} for same rake is
> selecting again DN1:ARCHIVE for target where already same block exists.
> {{chooseTargetInSameNode()}} and {{chooseTarget()}} should not select the
> node as target where already same replica exists. The dispatcher will fail
> to move block as shown in the log below. Then, the Mover will try again in
> next iteration.
> *Logs*
> {code}
> 15/04/15 10:47:17 WARN balancer.Dispatcher: Failed to move
> blk_1073741852_1028 with size=11990 from 10.19.92.74:50010:DISK to
> 10.19.92.73:50010:ARCHIVE through 10.19.92.73:50010: Got error, status
> message opReplaceBlock
> BP-1258709199-10.19.92.74-1428292615636:blk_1073741852_1028 received
> exception
> org.apache.hadoop.hdfs.server.datanode.ReplicaAlreadyExistsException: Replica
> FinalizedReplica, blk_1073741852_1028, FINALIZED
> {code}
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