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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4849) Idempotent create and append operations.
Date Mon, 17 Jun 2013 22:22:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13686093#comment-13686093
] 

Suresh Srinivas commented on HDFS-4849:
---------------------------------------

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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