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From "Cheng (JIRA)" <>
Subject [jira] Commented: (CHUKWA-68) Race condition could stop log file streaming
Date Mon, 06 Apr 2009 23:14:12 GMT


Cheng commented on CHUKWA-68:

I stopped and restarted name node gs301033 couple times. From the list 
command, I can see the adaptor was removed and added back and forth.
Waited for 10 minutes, did not find any problem. 

> Race condition could stop log file streaming
> --------------------------------------------
>                 Key: CHUKWA-68
>                 URL:
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>          Components: data collection
>         Environment: Redhat 5.1, Java 6
>            Reporter: Eric Yang
>            Assignee: 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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