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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-93) allow minimum split size configurable
Date Tue, 21 Mar 2006 17:39:00 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-93?page=all ]
     
Doug Cutting resolved HADOOP-93:
--------------------------------

    Resolution: Fixed
     Assign To: Doug Cutting

Okay, I have applied this.

For the record, patches are easier to apply if they are made from the root of the project.
 Also, new config properties should generally be added to hadoop-default.xml.  Finally, the
cast added in SequenceFileInputFormat was not required.

> allow minimum split size configurable
> -------------------------------------
>
>          Key: HADOOP-93
>          URL: http://issues.apache.org/jira/browse/HADOOP-93
>      Project: Hadoop
>         Type: Bug
>   Components: mapred
>     Versions: 0.1
>     Reporter: Hairong Kuang
>     Assignee: Doug Cutting
>      Fix For: 0.1
>  Attachments: hadoop-93.fix
>
> The current default split size is the size of a block (32M) and a SequenceFile sets it
to be SequenceFile.SYNC_INTERVAL(2K). We currently have a Map/Reduce application working on
crawled docuements. Its input data consists of 356 sequence files, each of which is of a size
around 30G. A jobtracker takes forever to launch the job because it needs to generate 356*30G/2K
map tasks!
> The proposed solution is to let the minimum split size configurable so that the programmer
can control the number of tasks to generate.

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