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https://issues.apache.org/jira/browse/HDFS-2229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082799#comment-13082799
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Tsz Wo (Nicholas), SZE commented on HDFS-2229:
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@Arun, it was introduced by HDFS-988; see [this 
comment|https://issues.apache.org/jira/browse/HDFS-2229?focusedCommentId=13080640&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13080640].

> Deadlock in NameNode
> --------------------
>
>                 Key: HDFS-2229
>                 URL: https://issues.apache.org/jira/browse/HDFS-2229
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Priority: Blocker
>         Attachments: cycle1.png, cycle2.png, h2229_20110807.patch
>
>
> Either I am doing something incredibly stupid, or something about my 
> environment is completely weird, or may be it really is a valid bug. I am 
> running a NameNode deadlock consistently with 0.23 HDFS. I could never start 
> NN successfully.

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