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From "Mac Yang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CHUKWA-68) Race condition could stop log file streaming
Date Mon, 06 Apr 2009 20:33:13 GMT

     [ https://issues.apache.org/jira/browse/CHUKWA-68?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mac Yang updated CHUKWA-68:
---------------------------

    Component/s: data collection

> 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
>          Components: data collection
>         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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