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From "Uma Maheswara Rao G (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3122) Block recovery with closeFile flag true can race with blockReport. Due to this blocks are getting marked as corrupt.
Date Wed, 21 Mar 2012 05:43:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-3122:
--------------------------------------

    Attachment: blockCorrupt.txt

attched the grepped logs.
                
> Block recovery with closeFile flag true can race with blockReport. Due to this blocks
are getting marked as corrupt.
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3122
>                 URL: https://issues.apache.org/jira/browse/HDFS-3122
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, name-node
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>            Priority: Critical
>         Attachments: blockCorrupt.txt
>
>
> *Block Report* can *race* with *Block Recovery* with closeFile flag true.
>  IF block report generated just befor recovery at DN side and due to N/W. This block
report got delayed to NN. Recovery success and generation stamp has been changed to new one.

> primary DN invokes the commitBlockSynchronization and block got updated in NN side. Also
marked as complete, since the closeFile flag is true. Updated with new genstamp.
> Now blockReport started processing at NN side. This particular block from RBW (when it
generated the BR at DN), and file was completed at NN side.
> Since the genartion stamps are mismatching, block is getting marked as corrupt.
> {code}
>  case RWR:
>       if (!storedBlock.isComplete()) {
>         return null; // not corrupt
>       } else if (storedBlock.getGenerationStamp() != iblk.getGenerationStamp()) {
>         return new BlockToMarkCorrupt(storedBlock,
>             "reported " + reportedState + " replica with genstamp " +
>             iblk.getGenerationStamp() + " does not match COMPLETE block's " +
>             "genstamp in block map " + storedBlock.getGenerationStamp());
>       } else { // COMPLETE block, same genstamp
> {code}

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