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https://issues.apache.org/jira/browse/HDFS-3267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252784#comment-13252784
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Todd Lipcon commented on HDFS-3267:
-----------------------------------

The test can be made to fail by adding a sleep(5000) at the start of 
BPServiceActor's thread.
                
> TestBlocksWithNotEnoughRacks races with DN startup
> --------------------------------------------------
>
>                 Key: HDFS-3267
>                 URL: https://issues.apache.org/jira/browse/HDFS-3267
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>
> In TestBlocksWithNotEnoughRacks.testCorruptBlockRereplicatedAcrossRacks, it 
> restarts a DN, and then proceeds to call "waitCorruptReplicas". But, because 
> of HDFS-3266, it doesn't actually wait very long while checking for the 
> corrupt block to be reported. Since the DN starts back up asynchronously, the 
> test will fail if it starts too slowly.

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