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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1265) Include tasktracker name in the task attempt error log
Date Tue, 08 Dec 2009 01:28:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12787235#action_12787235

Scott Chen commented on MAPREDUCE-1265:

This one changes only contents of the log. So there is no unit test included.

> Include tasktracker name in the task attempt error log
> ------------------------------------------------------
>                 Key: MAPREDUCE-1265
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1265
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.22.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>            Priority: Trivial
>             Fix For: 0.22.0
>         Attachments: MAPREDUCE-1265-v2.patch, MAPREDUCE-1265.patch
> When task attempt receive an error, TaskInProgress will log the task attempt id and diagnosis
string in the JobTracker log.
> Ex:
> 2009-xx-xx 23:50:45,994 INFO org.apache.hadoop.mapred.TaskInProgress: Error from attempt_2009xxxx_xxxx_r_000009_1:
Error: java.lang.OutOfMemoryError: Java heap space
> 2009-xx-xx 22:53:53,146 INFO org.apache.hadoop.mapred.TaskInProgress: Error from attempt_2009xxxx_xxxx_m_000478_0:
Task attempt_2009xxxx_xxxx_m_000478_0 failed to report status for 601 seconds. Killing!
> When we want to debug a machine for example, a node has been blacklisted in the past
few days.
> We have to use the task attempt id to find the TT. This is not very convenient. 
> It will be nice if  we can also log the tasktracker which causes this error.
> This way we can just grep the hostname to quickly find all the relevant error message.

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