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https://issues.apache.org/jira/browse/HDFS-8492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated HDFS-8492:
-----------------------------
    Fix Version/s:     (was: 2.9.0)

> DN should notify NN when client requests a missing block
> --------------------------------------------------------
>
>                 Key: HDFS-8492
>                 URL: https://issues.apache.org/jira/browse/HDFS-8492
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Walter Su
>             Fix For: 2.8.0, 3.0.0-alpha2
>
>         Attachments: HDFS-8492-02.patch, HDFS-8492.01.patch
>
>
> If the DN has a block its volume map but not on-disk, it tells clients it's 
> an invalid block id.  The NN is not informed of the missing block until 
> either the bp slice scanner or the directory scanner detects the missing 
> block.  DN should remove the replica from the volume map and inform the NN.



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