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https://issues.apache.org/jira/browse/HADOOP-3685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624801#action_12624801
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Hudson commented on HADOOP-3685:
--------------------------------
Integrated in Hadoop-trunk #581 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])
> Unbalanced replication target
> ------------------------------
>
> Key: HADOOP-3685
> URL: https://issues.apache.org/jira/browse/HADOOP-3685
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.0
> Reporter: Koji Noguchi
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.17.2
>
> Attachments: rereplicationPolicy.patch, rereplicationPolicy1.patch
>
>
> In HADOOP-3633, namenode was assigning some datanodes to receive hundreds of
> blocks in a short period which caused datanodes to go out of memroy(threads).
> Most of them were from remote rack.
> Looking at the code,
> {noformat}
> 166 chooseLocalRack(results.get(1), excludedNodes, blocksize,
> 167 maxNodesPerRack, results);
> {noformat}
> was sometimes not choosing the local rack of the writer(source).
> As a result, when a datanode goes down, other datanodes on the same rack were
> getting large number of blocks from remote racks.
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