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https://issues.apache.org/jira/browse/HDFS-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13668329#comment-13668329
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Matthew Farrellee commented on HDFS-4849:
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As a member of the community trying to create a FileSystem implementation, I
view these proposed changes as significant deviations from the semantics that
are being described as part of HADOOP-9371. The changes will better some use
cases while worsening others. The ability to implement them across all
FileSystems will also vary dramatically.
Please discuss the possibility of FileSystems optionally implementing these
enhanced semantics as part of HADOOP-9371, and do not add them to a 2.0.X.
> 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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