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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6240) Rename operation is not consistent between different implementations of FileSystem
Date Thu, 17 Sep 2009 04:03:57 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756357#action_12756357
] 

Sanjay Radia commented on HADOOP-6240:
--------------------------------------

> we're saying that we don't want to claim support for atomic renames in general within
a filesystem because the filesystem may be partitioned.
We are divided on this issue.
I am willing to accept such statements because a FS impl defines what partition means.
On the other hand Doug is saying that such a statement does not help an app since it does
not know which fs will be atomic;
his point is that, however, that your best chance (not 100%, but very high) is to do a rename
within a directory - most fs will support it,

You are right in that such a spec does put a restriction on how one builds a partitioned naming
system. Blind hashing will 
make atomic renames hard.

> Rename operation is not consistent between different implementations of FileSystem
> ----------------------------------------------------------------------------------
>
>                 Key: HADOOP-6240
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6240
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 0.21.0
>
>
> The rename operation has many scenarios that are not consistently implemented across
file systems.

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