TaskLogAppender does not check if closed before flushing
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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
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/%3c4e370c97-1541-4fda-8456-1067dddc4...@thelastpickle.com%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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