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https://issues.apache.org/jira/browse/HADOOP-4556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644433#action_12644433
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dhruba borthakur commented on HADOOP-4556:
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> These deletion requests might be sent after the datanode registers back again

But then this will delete a block that was anyway supposed to have been deleted 
much earlier. can this really cause the bug described?

> Block went missing
> ------------------
>
>                 Key: HADOOP-4556
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4556
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.2
>            Reporter: Robert Chansler
>            Assignee: Hairong Kuang
>
> Suspicion that all replicas of a block were marked for deletion. (Don't 
> panic, investigation underway.)

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