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From "Hari Mankude (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4872) Idempotent delete operation.
Date Wed, 05 Jun 2013 13:44:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675915#comment-13675915
] 

Hari Mankude commented on HDFS-4872:
------------------------------------

modTime cannot be used as unique parameter due to race between delete and append. 

If hdfs had cTime, it would have been a unique file specific value in combination with file
path. 
                
> Idempotent delete operation.
> ----------------------------
>
>                 Key: HDFS-4872
>                 URL: https://issues.apache.org/jira/browse/HDFS-4872
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.4-alpha
>            Reporter: Konstantin Shvachko
>
> Making delete idempotent is important to provide uninterrupted job execution in case
of HA failover.
> This is to discuss different approaches to idempotent implementation of delete.

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