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https://issues.apache.org/jira/browse/HDFS-12919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329669#comment-16329669
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Jason Lowe commented on HDFS-12919:
-----------------------------------
branch-3 should not exist at all (yet). It was accidentally created by a
committer recently. branch-3 will eventually track 3.x releases similar to how
branch-2 tracks 2.x releases. But for now trunk is already tracking 3.x
releases, so we do not need a branch-3. branch-3 should be created when trunk
moves to 4.0.0-SNAPSHOT, but in the meantime I'm in the process of asking for
the removal of branch-3.
> RBF: Support erasure coding methods in RouterRpcServer
> ------------------------------------------------------
>
> Key: HDFS-12919
> URL: https://issues.apache.org/jira/browse/HDFS-12919
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.0.0
> Reporter: Íñigo Goiri
> Assignee: Íñigo Goiri
> Priority: Critical
> Labels: RBF
> Fix For: 3.1.0, 3.0.1
>
> Attachments: HDFS-12919-branch-3.001.patch,
> HDFS-12919-branch-3.002.patch, HDFS-12919-branch-3.003.patch,
> HDFS-12919.000.patch, HDFS-12919.001.patch, HDFS-12919.002.patch,
> HDFS-12919.003.patch, HDFS-12919.004.patch, HDFS-12919.005.patch,
> HDFS-12919.006.patch, HDFS-12919.007.patch, HDFS-12919.008.patch,
> HDFS-12919.009.patch, HDFS-12919.010.patch, HDFS-12919.011.patch,
> HDFS-12919.012.patch, HDFS-12919.013.patch, HDFS-12919.013.patch,
> HDFS-12919.014.patch, HDFS-12919.015.patch, HDFS-12919.016.patch,
> HDFS-12919.017.patch, HDFS-12919.018.patch, HDFS-12919.019.patch,
> HDFS-12919.020.patch, HDFS-12919.021.patch, HDFS-12919.022.patch,
> HDFS-12919.023.patch
>
>
> MAPREDUCE-6954 started to tune the erasure coding settings for staging files.
> However, the {{Router}} does not support this operation and throws:
> {code}
> 17/12/12 14:36:07 INFO mapreduce.JobSubmitter: Cleaning up the staging area
> /tmp/hadoop-yarn/staging/hadoop/.staging/job_1513116010218_0002
> org.apache.hadoop.ipc.RemoteException(java.lang.UnsupportedOperationException):
> Operation "setErasureCodingPolicy" is not supported
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.checkOperation(RouterRpcServer.java:368)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.setErasureCodingPolicy(RouterRpcServer.java:1805)
> {code}
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