[jira] Updated: (HADOOP-1524) Task Logs userlogs don't show up for a while

["Sameer Paranjpye (JIRA)" <ji...@apache.org>]

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

Sameer Paranjpye updated HADOOP-1524:
-------------------------------------

    Component/s: mapred

> 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
>
> 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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