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https://issues.apache.org/jira/browse/HDFS-761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776755#action_12776755
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Tsz Wo (Nicholas), SZE commented on HDFS-761:
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+1 the 0.21 patch looks good.

> Failure to process rename operation from edits log due to quota verification
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-761
>                 URL: https://issues.apache.org/jira/browse/HDFS-761
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.20.2, 0.21.0, 0.22.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 0.20.2, 0.21.0, 0.22.0
>
>         Attachments: hdfs-761.1.patch, hdfs-761.1.patch, 
> hdfs-761.1.rel20.patch, hdfs-761.patch, hdfs-761.rel20.patch, 
> hdfs-761.rel21.patch
>
>
> When processing edits log, quota verification is not done and the used quota 
> for directories is not updated. The update is done at the end of processing 
> edits log. This rule is broken by change introduced in HDFS-677. This causes 
> namenode from handling rename operation from edits log due to quota 
> verification failure. Once this happens, namenode does not proceed edits log 
> any further. This results in check point failure on backup node or secondary 
> namenode. This also prevents namenode from coming up.

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