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https://issues.apache.org/jira/browse/HDFS-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667068#comment-13667068
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Steve Loughran commented on HDFS-4849:
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Delete is potentially a change in semantics, so goes under the FS spec changes.
That doesn't mean it is a bad idea, only that it is visible to all FS clients
-we're going to have to make sure it is consistent across all filesystems,
write tests for it, etc. etc.
> Idempotent create, append and delete operations.
> ------------------------------------------------
>
> Key: HDFS-4849
> URL: https://issues.apache.org/jira/browse/HDFS-4849
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.0.4-alpha
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
>
> create, append and delete operations can be made idempotent. This will reduce
> chances for a job or other app failures when NN fails over.
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