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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] Created: (CHUKWA-68) Race condition could stop log file streaming
Date Tue, 31 Mar 2009 01:39:50 GMT
Race condition could stop log file streaming
--------------------------------------------

                 Key: CHUKWA-68
                 URL: https://issues.apache.org/jira/browse/CHUKWA-68
             Project: Hadoop Chukwa
          Issue Type: Bug
         Environment: Redhat 5.1, Java 6
            Reporter: Eric Yang
            Priority: Blocker


When log file is actively writing with log4j appender, and fileTailingAdaptor is behind. 
There is a possibility that restart the java program might stop log file streaming.

Here is an example of what could go wrong:

04:01 Shutdown Name Node.
04:01 Terminator Thread kick in and streaming the remaining log.
04:02 Name Node Started up
04:03 Register of namenode log file failed because it is already streaming.
04:20 Terminator Thread finished the log file, unregister name node log for streaming.

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