I tried to use your quick workaround but the task is lasting really longer than before even if it uses 2 mappers in //. The fact is that there are 1000 tasks. Are you using vnodes ? I didn't try to disable them.

Kind% CompleteNum TasksPendingRunningCompleteKilledFailed/Killed
Task Attempts
map7.64%
102594527800 / 0
reduce2.53%
101000 / 0



-- 
Cyril SCETBON

On May 5, 2013, at 8:45 AM, Shamim <srecon@yandex.ru> wrote:

Hello,
  We have also came across this issue in our dev environment, when we upgrade Cassandra from 1.1.5 to 1.2.1 version. I have mentioned this issue in few times in this forum but haven't got any answer yet. For quick work around you can use pig.splitCombination false in your pig script to avoid this issue, but it will make one of your task with a very big amount of data. I can't figure out why this happening in newer version of Cassandra, strongly guess some thing goes wrong in Cassandra implementation of LoadFunc or in Murmur3Partition (it's my guess).
Here is my earliar post
http://www.mail-archive.com/user@cassandra.apache.org/msg28016.html
http://www.mail-archive.com/user@cassandra.apache.org/msg29425.html

Any comment from authors will be highly appreciated
P.S. please keep me in touch with any solution or hints.

--
Best regards
  Shamim A.



03.05.2013, 19:25, "cscetbon.ext@orange.com" <cscetbon.ext@orange.com>:
Hi,
I'm using Pig to calculate the sum of a columns from a columnfamily (scan of all rows) and I've read that input data locality is supported at http://wiki.apache.org/cassandra/HadoopSupport
However when I execute my Pig script Hadoop assigns only one mapper to the task and not one mapper on each node (replication factor = 1).  FYI, I've 8 mappers available (2 per node).
Is there anything that can disable the data locality feature ?

Thanks
--
Cyril SCETBON

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