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From "Michael Bieniosek (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1524) Task Logs userlogs don't show up for a while
Date Sat, 23 Jun 2007 20:13:25 GMT
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
    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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