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https://issues.apache.org/jira/browse/HADOOP-7556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087522#comment-13087522
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Aaron Morton commented on HADOOP-7556:
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I see my patch failed. Could some one tell me the correct branch (was using
branch-0.20) and I will rebase.
> TaskLogAppender does not check if closed before flushing
> --------------------------------------------------------
>
> Key: HADOOP-7556
> URL: https://issues.apache.org/jira/browse/HADOOP-7556
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.203.0
> Reporter: Aaron Morton
> Priority: Minor
> Attachments: HADDOP-7556.diff
>
>
> For background see
> http://groups.google.com/group/brisk-users/browse_thread/thread/3a18f4679673bea8
> http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201108.mbox/%[email protected]%3E
> Cassandra is using a log4j PropertyConfigurator which is closing all existing
> appenders. After a task has completed the TaskLogAppender.flush() is called
> and it tries to flush without checking if the writer has been closed. I'll
> upload a patch to check if the writer is closed, and log and silently fail if
> it is.
> The real problem is the log4j config collision, we're looking to different
> log4j LoggerRepositories for that.
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