Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Pig, mail # user - Multiple maps for a small input file

Copy link to this message
Re: Multiple maps for a small input file
Dmitriy Ryaboy 2012-04-24, 00:42
Set mapred.min.split.size


On Mon, Apr 23, 2012 at 4:30 PM, Sam William <[EMAIL PROTECTED]> wrote:
> I have a file on  HDFS with a reduced block size.  I created this overriding the dfs.block.size param on the hadoop fs -put command .  hadoop fsck shows that this file has 15 blocks (as opposed to the normal 1 block) I did it so as to force Pig to use  more maps than normal .   On my pig command line   I  specify ' pig  -Dpig.splitCombination=false ' to turn off the defaulr split combination logic.   The jobs still ends running just one mapper.  How can I achieve  multiple maps ?    Splitting the original file into multiple files would be my last resort.
> Sam William