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https://issues.apache.org/jira/browse/HADOOP-4395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639190#action_12639190
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Raghu Angadi commented on HADOOP-4395:
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I think a considerable part of the reason why this bug got in is lack of
javadoc contract for setOwner() methods. Though these are supposed to be hdfs
internal, javadoc should have been there. But this comment is too late for this
jira I guess.
> Reloading FSImage and FSEditLog may erase user and group information
> --------------------------------------------------------------------
>
> Key: HADOOP-4395
> URL: https://issues.apache.org/jira/browse/HADOOP-4395
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Priority: Blocker
> Fix For: 0.18.2
>
> Attachments: 4395_20081010.patch, 4395_20081011.patch,
> 4395_20081011_0.18.patch
>
>
> The bug can be reproduced as following:
> {noformat}
> bash-3.2$ ./bin/hadoop fs -lsr
> -rw-r--r-- 3 tsz supergroup 1366 2008-10-10 17:52 /user/tsz/a.txt
> -rw-r--r-- 3 tsz supergroup 1366 2008-10-10 17:52 /user/tsz/b.txt
> bash-3.2$ ./bin/hadoop fs -chown sze a.txt
> bash-3.2$ ./bin/hadoop fs -lsr
> -rw-r--r-- 3 sze supergroup 1366 2008-10-10 17:52 /user/tsz/a.txt
> -rw-r--r-- 3 tsz supergroup 1366 2008-10-10 17:52 /user/tsz/b.txt
> {noformat}
> Then, restart cluster ...
> {noformat}
> bash-3.2$ ./bin/hadoop fs -lsr
> -rw-r--r-- 3 sze 1366 2008-10-10 17:52 /user/tsz/a.txt
> -rw-r--r-- 3 tsz supergroup 1366 2008-10-10 17:52 /user/tsz/b.txt
> {noformat}
> The group information for a.txt is missing.
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