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Why a sql only use one map task?

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

Problem in hive

HI team, i m facing this problem. show tables is running fine but when i run below query. hive select * from aircel_obd; FAILED: Hive Internal Error: java.lang.NullPointerException(null) java.lang.NullPointerException at

Re: Why a sql only use one map task?

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...@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

Re: Hive Custom UDF - hive.aux.jars.path not working

Hi Chinna, That worked, Thanks a lot. So once the jar is picked up, is there a way to create a temporary function, that is retained even if i quit the interactive shell and start it again? Or do i have to use the create command to register the function everytime? Thanks. Amit On Mon, Aug 22,

Re: Hive Custom UDF - hive.aux.jars.path not working

Hi Amit, Pls check this issue HIVE-1405 it will help u .This issue targeting same scenario. Thanks Chinna Rao Lalam Hi Chinna, That worked, Thanks a lot. So once the jar is picked up, is there a way to create a temporary function, that is retained even if i quit the interactive

RE: Why a sql only use one map task?

If you actually have splittable files you can set the following setting to create more splits: mapred.max.split.size appropriately. Thanks Vaibhav From: Daniel,Wu [mailto:hadoop...@163.com] Sent: Tuesday, August 23, 2011 6:51 AM To: hive Subject: Why a sql only use one map task? I run the