[
https://issues.apache.org/jira/browse/HADOOP-960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Owen O'Malley resolved HADOOP-960.
----------------------------------
Resolution: Won't Fix
This may not be documented well enough, but it is not a bug. The rules for
picking input split sizes are complicated, but usually a split is 1 dfs block.
The number of maps requested is a hint to the InputFormat, nothing else. To get
the behavior that you want, you can set mapred.min.split.size to a large value.
It will force the splits to contain the entire contents of a single file.
> Incorrect number of map tasks when there are multiple input files
> -----------------------------------------------------------------
>
> Key: HADOOP-960
> URL: https://issues.apache.org/jira/browse/HADOOP-960
> Project: Hadoop
> Issue Type: Bug
> Affects Versions: 0.10.1
> Reporter: Andrew McNabb
>
> This problem happens with hadoop-streaming and possibly elsewhere. If there
> are 5 input files, it will create 130 map tasks, even if
> mapred.map.tasks=128. The number of map tasks is incorrectly set to a
> multiple of the number of files. (I wrote a much more complete bug report,
> but Jira lost it when it had an error, so I'm not in the mood to write it all
> again)
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
