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https://issues.apache.org/jira/browse/HDFS-6701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071733#comment-14071733
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Hudson commented on HDFS-6701:
------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #1813 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1813/])
HDFS-6701. Make seed optional in NetworkTopology#sortByDistance. Contributed by
Ashwin Shankar. (wang:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1612625)
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopologyWithNodeGroup.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestNetworkTopologyWithNodeGroup.java
* /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/DFSConfigKeys.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/net/TestNetworkTopology.java
> Make seed optional in NetworkTopology#sortByDistance
> ----------------------------------------------------
>
> Key: HDFS-6701
> URL: https://issues.apache.org/jira/browse/HDFS-6701
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.5.0
> Reporter: Ashwin Shankar
> Assignee: Ashwin Shankar
> Fix For: 2.6.0
>
> Attachments: HDFS-6701-v1.txt, HDFS-6701-v3-branch2.txt,
> HDFS-6701-v3.txt, HDFS-6701-v4-branch2.txt, HDFS-6701-v4.txt
>
>
> Currently seed in NetworkTopology#sortByDistance is set to the blockid which
> causes the RNG to generate same pseudo random order for each block. If no
> node local block location is present,this causes the same rack local replica
> to be hit for a particular block.
> It'll be good to make the seed optional, so that one could turn it off if
> they want block locations of a block to be randomized.
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