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https://issues.apache.org/jira/browse/HDFS-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13685884#comment-13685884
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Konstantin Shvachko commented on HDFS-4849:
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> How does one guarantee the client name is unique?
I thought this was answered [in this
comment|https://issues.apache.org/jira/browse/HDFS-4849?focusedCommentId=13670136&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13670136].
To summarize: current HDFS takes client names from applications. MR guarantees
the uniqueness. The other applications should too.
> This could also happen for multithreaded clients.
I elaborated on multithreaded clients in the same comment as Todd raised this
question. See second part.
> How does one know this audit event is for a retried call vs possible bug that
> might have logged an audit event twice?
Well if there is a bug we should fix it.
> This jira started out to be much larger in scope.
I proposed to reuse the jira for create and append [in this
comment|https://issues.apache.org/jira/browse/HDFS-4849?focusedCommentId=13671661&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13671661].
Created HDFS-4872 for the delete work with this issue linked to it.
I don't mind reorganizing jiras as you wish.
> 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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