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https://issues.apache.org/jira/browse/HDFS-1152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931201#action_12931201
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Todd Lipcon commented on HDFS-1152:
-----------------------------------
I'm not certain if this has been seen in production, but it's clearly incorrect
in 0.20-append. Wouldn't call it a blocker, since it's a pretty narrow race
that hasn't been observed, but don't see a reason *not* to commit either.
> appendFile does not recheck lease in second synchronized block
> --------------------------------------------------------------
>
> Key: HDFS-1152
> URL: https://issues.apache.org/jira/browse/HDFS-1152
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20-append, 0.21.0, 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: appendFile-recheck-lease.txt, hdfs-1152.txt
>
>
> FSN.appendFile is made up of two synchronized sections. The second section
> assumes that the file has not gotten modified during the unsynchronized part
> in between. We should recheck the lease in the second block.
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