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https://issues.apache.org/jira/browse/HDFS-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13686093#comment-13686093
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Suresh Srinivas commented on HDFS-4849:
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bq. A file system built using idempotent operations lends itself more naturally
to having multiple NameNodes: active-standby or active-active.
I agree. I am all for turning all the operations to idempotent operations. But
not at the expense of correctness. Please see my comments for more details on
how things can go wrong.
> Idempotent create and append operations.
> ----------------------------------------
>
> Key: HDFS-4849
> URL: https://issues.apache.org/jira/browse/HDFS-4849
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.0.4-alpha
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Blocker
> Attachments: idempotentCreate.patch, idempotentCreate.patch
>
>
> 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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