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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2791) If block report races with closing of file, replica is incorrectly marked corrupt
Date Sun, 15 Jan 2012 05:40:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-2791:
------------------------------

    Attachment: hdfs-2791-test.txt

Test illustrating the bug
                
> If block report races with closing of file, replica is incorrectly marked corrupt
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-2791
>                 URL: https://issues.apache.org/jira/browse/HDFS-2791
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, name-node
>    Affects Versions: 0.22.0, 0.23.0
>            Reporter: Todd Lipcon
>         Attachments: hdfs-2791-test.txt
>
>
> The following sequence of events results in a replica mistakenly marked corrupt:
> 1. Pipeline is open with 2 replicas
> 2. DN1 generates a block report but is slow in sending to the NN (eg some flaky network).
It gets "stuck" right before the block report RPC.
> 3. Client closes the file.
> 4. DN2 is fast and sends blockReceived to the NN. NN marks the block as COMPLETE
> 5. DN1's block report proceeds, and includes the block in an RBW state.
> 6. (x) NN incorrectly marks the replica as corrupt, since it is an RBW replica on a COMPLETE
block.

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