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https://issues.apache.org/jira/browse/HDFS-4996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712832#comment-13712832
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Jing Zhao commented on HDFS-4996:
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+1 for the patch also.
> ClientProtocol#metaSave can be made idempotent by overwriting the output file
> instead of appending to it
> --------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4996
> URL: https://issues.apache.org/jira/browse/HDFS-4996
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 3.0.0, 2.1.0-beta
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Priority: Minor
> Attachments: HDFS-4996.1.patch, HDFS-4996.2.patch
>
>
> {{ClientProtocol#metaSave}} opens its output file for append. This prevents
> the operation from being idempotent, because retries can cause unpredictable
> side effects (single copy of the output vs. multiple copies). As discussed
> on HDFS-4974, the operation could be made idempotent by changing this to open
> the file for overwrite instead of append.
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