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https://issues.apache.org/jira/browse/HDFS-6948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140484#comment-14140484
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Kihwal Lee commented on HDFS-6948:
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+1 the latest patch looks good.
> DN rejects blocks if it has older UC block
> ------------------------------------------
>
> Key: HDFS-6948
> URL: https://issues.apache.org/jira/browse/HDFS-6948
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Eric Payne
> Attachments: HDFS-6948.201409052147.txt, HDFS-6948.201409081817.txt,
> HDFS-6948.201409101802.txt
>
>
> DNs appear to always reject blocks, even with newer genstamps, if it already
> has a UC copy in its tmp dir.
> {noformat}ReplicaAlreadyExistsException: Block
> XXX already
> exists in state TEMPORARY and thus cannot be created{noformat}
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