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https://issues.apache.org/jira/browse/HDFS-5828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888905#comment-13888905
]
Hadoop QA commented on HDFS-5828:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12626306/HDFS-5828a.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new
or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/6009//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6009//console
This message is automatically generated.
> 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
> 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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