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https://issues.apache.org/jira/browse/MAPREDUCE-1413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833756#action_12833756
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Steve Loughran commented on MAPREDUCE-1413:
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The log calls aren't logging the _whole_ exception twice
# The log message includes the toString() value of the exception, normally the
value of getMessage(), though that can be changed. This message doesn't include
the stack trace
# The second parameter passes in the raw exception chain with full stack trace.
It is up to the log engine what it does with that; printing out the stack trace
in text is one option, but I know of others (discard, save the fault as an
XML-parseable). This is why log(text,Throwable) is the recommended way to log
faults in all the main java log frameworks.
# Sometimes I've seen loggers not log the toString() value of the exception
passed in as param #2, which is less than ideal if you are trying to track down
a problem and all you have are the logs.
# Therefore, I do think what I've done is the best tactic to producing logs
that are human and machine readable.
# Will check out the javadoc error and submit a patch that corrects that.
> Improve logging of progress/errors in the job and task trackers
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-1413
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1413
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: tasktracker
> Affects Versions: 0.22.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1413.patch
>
>
> I have code that improves the logging of the trackers as they start stop and
> fail, through
> # More logging of events
> # including exception strings and stacks when things go wrong
> People's whose JTs and TTs aren't behaving may appreciate this
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