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https://issues.apache.org/jira/browse/CHUKWA-267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714229#action_12714229
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Cheng commented on CHUKWA-267:
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Suppose two threads reach the point of "synchronized (chukwaLock)" at the same
time. After one thread quits from the sync block, another thread will take
turn. It means the code inside the sync block will be executed twice. It means
the file will be added more than one time; ClientFinalizer will be created more
than one time, etc.
> Collect shuffling information from userlogs/syslog
> --------------------------------------------------
>
> Key: CHUKWA-267
> URL: https://issues.apache.org/jira/browse/CHUKWA-267
> Project: Hadoop Chukwa
> Issue Type: New Feature
> Components: data collection
> Affects Versions: 0.2.0
> Environment: Redhat EL 5.1, Java 6
> Reporter: Eric Yang
> Assignee: Eric Yang
> Fix For: 0.1.2, 0.2.0
>
> Attachments: CHUKWA-267.patch
>
>
> Hadoop uses a customized version of log4j appender
> (org.apache.hadoop.mapred.TaskLogAppender) for tasks. Shuffling information
> is written to userlogs/syslog by TaskLogAppender. For chukwa to collect
> shuffling information, we need to write a new TaskLogAppender to do this.
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