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https://issues.apache.org/jira/browse/HDFS-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881970#action_12881970
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Todd Lipcon commented on HDFS-1263:
-----------------------------------
I think I actually fixed this with a patch in HDFS-1260 - the problems turned
out to be the same. Can you take a look at that patch and let me know what you
think?
> 0.20: in tryUpdateBlock, the meta file is renamed away before genstamp
> validation is done
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-1263
> URL: https://issues.apache.org/jira/browse/HDFS-1263
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 0.20-append
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.20-append
>
>
> Saw an issue where multiple datanodes are trying to recover at the same time,
> and all of them failed. I think the issue is in FSDataset.tryUpdateBlock, we
> do the rename of blk_B_OldGS to blk_B_OldGS_tmpNewGS and *then* check that
> the generation stamp is moving upwards. Because of this, invalid update block
> calls are blocked, but they then cause future updateBlock calls to fail with
> "Meta file not found" errors.
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