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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-654) HDFS needs to support new rename introduced for FileContext
Date Fri, 23 Oct 2009 16:56:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769294#action_12769294
] 

Suresh Srinivas commented on HDFS-654:
--------------------------------------

I have made all the changes suggested. Here are my comments:
>  1.  FSNamesystem.renameTo() should not be public.
Currently all methods called from NameNode are public. I followed the same pattern. I have
change renameTo methods both old and new to package private.

>   5. Is OIV will be able to read new rename edit log records? Just adding the new supported
version probably does not fix the reading problem by itself.
Per Jakob, the OIV reads FSImage only and not edit log. It needs to know all the supported
versions. Without updating it, it will not load the FSImage with the new version.



> HDFS needs to support new rename introduced for FileContext
> -----------------------------------------------------------
>
>                 Key: HDFS-654
>                 URL: https://issues.apache.org/jira/browse/HDFS-654
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 0.21.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 0.22.0
>
>         Attachments: hdfs-654.1.patch, hdfs-654.2.patch, hdfs-654.3.patch, hdfs-654.5.patch,
hdfs-654.5.patch, hdfs-654.7.patch, HDFS-654.patch
>
>
> New rename functionality with different semantics to overwrite the existing destination
was introduced for use in FileContext. Currently the default implementation in FileSystem
is not atomic. This change implements atomic rename operation for use by FileContext.

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