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Posted to dev@chukwa.apache.org by "Cheng (JIRA)" <ji...@apache.org> on 2009/04/07 01:20:13 UTC
[jira] Issue Comment Edited: (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=12696293#action_12696293 ]
Cheng edited comment on CHUKWA-68 at 4/6/09 4:18 PM:
-----------------------------------------------------
I stopped and restarted name node 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.
was (Author: zhangyongjiang):
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: 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
> 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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