[ http://issues.apache.org/jira/browse/HADOOP-484?page=all ]
Owen O'Malley resolved HADOOP-484.
----------------------------------
Resolution: Duplicate
Splitting a reduce would be difficult and error-prone while it was in progress.
The standard approach for this problem is to use speculative execution to
shorten the tail. It seems to be very effective.
> Additional splilts for last reduces?
> ------------------------------------
>
> Key: HADOOP-484
> URL: http://issues.apache.org/jira/browse/HADOOP-484
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: arkady borkovsky
>
> Often last few reduces take very long.
> Would it make sense, if hardware is available, to resplit their inputs into
> smaller chunks and to run multiple task instead?
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
