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From Vikas Srivastava <vikas.srivast...@one97.net>
Subject Re: Why a sql only use one map task?
Date Tue, 23 Aug 2011 13:58:04 GMT
hey did u storing data in zipped format

if yes becoz of that its only split in single map.

2011/8/23 Daniel,Wu <hadoop_wu@163.com>

>   I run the following simple sql
> select count(*) from sales;
> And the job information shows it only uses one map task.
>
> The underlying hadoop has 3 data/data nodes. So I expect hive should kick
> off 3 map tasks, one on each task nodes. What can make hive only run one map
> task? Do I need to set something to kick off multiple map task?  in my
> config, I didn't change hive config.
>
>
>


-- 
With Regards
Vikas Srivastava

DWH & Analytics Team
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