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Date: Thu, 24 Jun 2010 04:24:51 -0400 (EDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1263) 0.20: in tryUpdateBlock, the meta
 file is renamed away before genstamp validation is done
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    [ https://issues.apache.org/jira/browse/HDFS-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882088#action_12882088 ] 

dhruba borthakur commented on HDFS-1263:
----------------------------------------

after reading through the description, it appears to me that this bug is similar to the one described in HDFS-1260. Shall we close this one as a duplicate?

> 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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