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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1524) Task Logs userlogs don't show up for a while
Date Mon, 09 Jul 2007 17:35:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511189
] 

Owen O'Malley commented on HADOOP-1524:
---------------------------------------

That is because the tasklog.jsp supports reading from an offset with the intention of tailing
the logs. If you don't keep the length of the deleted logs you can't tail because the offsets
would change with every deletion.

> Task Logs userlogs don't show up for a while 
> ---------------------------------------------
>
>                 Key: HADOOP-1524
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1524
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.13.0
>            Reporter: Michael Bieniosek
>         Attachments: eliminate-split-idx.patch
>
>
> When I start a task and go to the task logs, nothing shows up for a while.  An examination
of TaskLog.Writer and TaskLog.Reader reveals:
> 1. The TaskLog.Reader relies on the presence of a split.idx to identify the parts of
the logs to display.
> 2. The TaskLog.Writer only updates the split.idx file when it moves on to the next log.
> As a result, updates to the log only get pushed when an entire file is done.
> Why is there a split.idx file?  It seems that since files are called part-00000, part-00001,
etc., the TaskLog.Reader can just look at all files and arrange them by alphabetical order.
 The split.idx file also contains file length, but this data is already stored by the filesystem.
> If nobody has objections, I'd like to write a patch to eliminate the split.idx file.

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