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https://issues.apache.org/jira/browse/HDFS-5828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889476#comment-13889476
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Hudson commented on HDFS-5828:
------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1662 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1662/])
HDFS-5828. BlockPlacementPolicyWithNodeGroup can place multiple replicas on the
same node group when dfs.namenode.avoid.write.stale.datanode is true. (Buddy
via junping_du) (junping_du:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1563640)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicyWithNodeGroup.java
> BlockPlacementPolicyWithNodeGroup can place multiple replicas on the same
> node group when dfs.namenode.avoid.write.stale.datanode is true
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-5828
> URL: https://issues.apache.org/jira/browse/HDFS-5828
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.3.0
> Reporter: Buddy
> Assignee: Buddy
> Fix For: 2.4.0
>
> Attachments: HDFS-5828.patch, HDFS-5828a.patch
>
>
> When placing replicas using the replica placement policy
> BlockPlacementPolicyWithNodeGroup, the number of targets returned should be
> less than or equal to the number of node groups and no node group should get
> two replicas of the same block. The Junit test
> TestReplicationPolicyWithNodeGroup.testChooseMoreTargetsThanNodeGroups
> verifies this.
> However, if the conf property "dfs.namenode.avoid.write.stale.datanode" is
> set to true, then block placement policy will return more targets than node
> groups when the number of replicas requested exceeds the number of node
> groups.
> This can be seen by putting:
> CONF.setBoolean(DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_WRITE_KEY, true);
> in the setup method for TestReplicationPolicyWithNodeGroup. This will cause
> testChooseMoreTargetsThanNodeGroups to fail.
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