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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5709) Improve upgrade with existing files and directories named ".snapshot"
Date Mon, 03 Feb 2014 19:10:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889767#comment-13889767
] 

Jing Zhao commented on HDFS-5709:
---------------------------------

The v6 patch looks good to me. Besides the comments from [~atm], just one minor comment: 
in useDefaultRenameReservedPairs, instead of calling setRenameReservedMapInternal, can we
just directly add the two default reserved pairs into the map? With this change we can avoid
some unnecessary string processing and make it easier to add other default reserved pairs
in the future. 



> Improve upgrade with existing files and directories named ".snapshot"
> ---------------------------------------------------------------------
>
>                 Key: HDFS-5709
>                 URL: https://issues.apache.org/jira/browse/HDFS-5709
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>              Labels: snapshots, upgrade
>         Attachments: hdfs-5709-1.patch, hdfs-5709-2.patch, hdfs-5709-3.patch, hdfs-5709-4.patch,
hdfs-5709-5.patch, hdfs-5709-6.patch
>
>
> Right now in trunk, upgrade fails messily if the old fsimage or edits refer to a directory
named ".snapshot". We should at least print a better error message (which I believe was the
original intention in HDFS-4666), and [~atm] proposed automatically renaming these files and
directories.



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