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Posted to dev@chukwa.apache.org by "Jerome Boulon (JIRA)" <ji...@apache.org> on 2009/04/03 18:38:13 UTC
[jira] Commented: (CHUKWA-68) Race condition could stop log file
streaming
[ https://issues.apache.org/jira/browse/CHUKWA-68?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695482#action_12695482 ]
Jerome Boulon commented on CHUKWA-68:
-------------------------------------
Hi,
Not sure to understand correctly because TerminatorThread is not doing any unregister, so "04:20 Terminator Thread finished the log file, unregister name node log for streaming." is not possible.
If Name node send at 04:01 Shutdown Name Node,
then the agent process the command, the result is :
---> remove this adaptor from the list of adaptors
---> At this point any request to add the same log file should succeed, because for the agent, this adaptor doesn't exist.
So, if "04:03 Register of namenode log file failed" it should not be because of the terminatorThread or we have a bug
-- a call to adaptor.shutdown
Then adaptor.shutdown will start the TerminatorThread
Assuming the NameLog keep writing to the log file, TerminatorThread will stop 10 minutes later.
So do you have a real case where you have seen this?
> 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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