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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1152) appendFile does not recheck lease in second synchronized block
Date Thu, 11 Nov 2010 21:16:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931201#action_12931201
] 

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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