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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4849) Idempotent create and append operations.
Date Tue, 18 Jun 2013 00:35:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13686237#comment-13686237
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Konstantin Shvachko commented on HDFS-4849:
-------------------------------------------

Checked setReplication, setTimes, setOwner, etc. All don't care about retries.
LMK if you want me to do something about it. IMO if operation is idempotent the log records
of them should be treated that way as well.
                
> 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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