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https://issues.apache.org/jira/browse/HDFS-5024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719048#comment-13719048
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Chris Nauroth commented on HDFS-5024:
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+1 for the patch. Thanks for the effort to cover this with a test too!
> Make DatanodeProtocol#commitBlockSynchronization idempotent
> -----------------------------------------------------------
>
> Key: HDFS-5024
> URL: https://issues.apache.org/jira/browse/HDFS-5024
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0, 2.1.0-beta
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: HDFS-5024.001.patch, HDFS-5024.002.patch,
> HDFS-5024.003.patch, HDFS-5024.004.patch, HDFS-5024.005.patch,
> HDFS-5024.006.patch
>
>
> commitBlockSynchronization is not idempotent (repeated invocations with the
> same arguments will throw an exception). By making it Idempotent we can
> remove the requirement to track invocations using the retry cache.
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