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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 00:27:57 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756298#action_12756298
] 

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


Proposal for rename spec
#  Rename may be atomic; please see the fs impl for further details. 
# Most file system are likely to support atomic renames within a dir.
Is item 2 even needed?

If we all agree on the above then lets move forward. 
There is a part  (see below the line)  that still puzzles me, but we can resolve that later.


------

It appears that you are being inconsistent  in dealing with the lack of guarantee in atomicity
for  rename across dirs and within dirs.
Neither are guaranteed to be atomic  across *all* file system but your wording for the two
seems to be different.

You are objecting to me adding 
* Some FSs may also support atomic rename across dirs within the same volume and partition.
How is this different from item 2 above?


Further you are implicitly saying that we do NOT support use cases for doing a rename across
dirs.
 I am not disagreeing with you but I am worried that since most filesystems support atomic
renames across dirs, we are indeed 
dropping an important use case.



> 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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