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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1258) Clearing namespace quota on "/" corrupts FS image
Date Tue, 22 Jun 2010 22:37:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881424#action_12881424
] 

Tom White commented on HDFS-1258:
---------------------------------

This is serious, for sure, but I think we could release 0.21.0 without it. The point of 0.21.0
is to exercise the release process, and make a Hadoop release available to people who want
to try newer features and help stabilize post-20 Hadoop, so that later 0.21 releases and the
0.22 release in November will be more widely usable. 0.21 already has known issues (e.g. HDFS-875),
so this one too could be called out in the release notes, so folks are made aware of its seriousness.

> Clearing namespace quota on "/" corrupts FS image
> -------------------------------------------------
>
>                 Key: HDFS-1258
>                 URL: https://issues.apache.org/jira/browse/HDFS-1258
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>            Reporter: Aaron T. Myers
>            Priority: Blocker
>             Fix For: 0.20.3, 0.21.0, 0.22.0
>
>
> The HDFS root directory starts out with a default namespace quota of Integer.MAX_VALUE.
If you clear this quota (using "hadoop dfsadmin -clrQuota /"), the fsimage gets corrupted
immediately. Subsequent 2NN rolls will fail, and the NN will not come back up from a restart.

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