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https://issues.apache.org/jira/browse/HDFS-1699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001680#comment-13001680
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Suresh Srinivas commented on HDFS-1699:
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+1 for the patch.

> HDFS Federation: fix failure of TestBlockReport
> -----------------------------------------------
>
>                 Key: HDFS-1699
>                 URL: https://issues.apache.org/jira/browse/HDFS-1699
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: Federation Branch
>            Reporter: Matt Foley
>            Assignee: Matt Foley
>             Fix For: Federation Branch
>
>         Attachments: BZ-4177741-v2.patch
>
>
> FS is no longer immediately available when a datanode activates; one must 
> wait for it to negotiate with a namenode and
> establish a blockpool.  The current code was attempting to fetch FS too fast 
> and getting null.  

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