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From "Jerome Boulon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CHUKWA-267) Collect shuffling information from userlogs/syslog
Date Fri, 29 May 2009 17:24:45 GMT

    [ https://issues.apache.org/jira/browse/CHUKWA-267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714520#action_12714520
] 

Jerome Boulon commented on CHUKWA-267:
--------------------------------------

Eric, this fix this appender but does not fix ChukwaDailyRollingFileAppender.
So instead of duplicating code and propagate errors or code could you create a singleton class
that will be responsible for the registration with our agent.
This should be a singleton class with only a static access method and a private constructor.
That way we can ensure that the code is only at one place and we don;t have to worry about
fixing the same code in several classes.

Also, the same thing could be apply to the way we are writing a log4j event. ChukwaDailyRollingFileAppender
is able to write exceptions, I'm not sure if yours is doing that. So could you write an helper
class that will be reused cross Chukwa-appender that will do the correct escaping for both
standard log4j event and the ones that contain some exception.

Thanks.



> 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-267-1.patch, 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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