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https://issues.apache.org/jira/browse/HDFS-6680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069320#comment-14069320
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Devaraj Das commented on HDFS-6680:
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I see.. good catch. Looks good to me.
> BlockPlacementPolicyDefault does not choose favored nodes correctly
> -------------------------------------------------------------------
>
> Key: HDFS-6680
> URL: https://issues.apache.org/jira/browse/HDFS-6680
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: h6680_20140714.patch, h6680_20140716.patch
>
>
> In one of the chooseTarget(..) methods, it tries all the favoredNodes to
> chooseLocalNode(..). It expects chooseLocalNode to return null if the local
> node is not a good target. Unfortunately, chooseLocalNode will fallback to
> chooseLocalRack but not returning null.
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