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From "Ari Rabkin (JIRA)" <>
Subject [jira] Commented: (CHUKWA-68) Race condition could stop log file streaming
Date Sun, 05 Apr 2009 10:13:13 GMT


Ari Rabkin commented on CHUKWA-68:

Suppose the namenode never tried to unregister the log -- would that solve the problem?  Seems
like that's actually the right behavior.  The cost of having Chukwa continue watching the
file is pretty low.

> Race condition could stop log file streaming
> --------------------------------------------
>                 Key: CHUKWA-68
>                 URL:
>             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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