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https://issues.apache.org/jira/browse/HDFS-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240883#comment-13240883
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Uma Maheswara Rao G commented on HDFS-3122:
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@Todd, Did you look at this issue?
Want to invite you on this issue for solution discussions. It looks like, it is
hard to identify the block corruption at this situation.
> 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.
> Block report generated just before block recovery at DN side and due to N/W
> problems, block report got delayed to NN.
> After this, recovery success and generation stamp modifies to new one.
> And primary DN invokes the commitBlockSynchronization and block got updated
> in NN side. Also block got marked as complete, since the closeFile flag was
> 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.
> Finally block will be marked as corrupt because of genstamp mismatch.
> {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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