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From vaibhav negi <>
Subject Long query execution time
Date Thu, 21 Apr 2011 09:31:08 GMT
Hi All,

I am using hive 0.7 with hadoop 0.20.2 .  Cluster has 9 data nodes / task
tracker .  I am running a query on table containing 900 GB data (approx) in
4000 partitions  .

query construct is like ->

from table
insert overwrite table1 select distinct col1
insert overwrite table2 select distinct col2
insert overwrite table3 select distinct col3
insert overwrite table4 select distinct col4
insert overwrite table5 select distinct col5

It generates 5 Map reduce jobs

1st job having 18000 map attempts and 999 ( max limit ) reduce attempts .

In this  way , it will not return in ways .

In order to speed up the query ,

Can query be constructed in some other , optimized way?
Can total number of map reduce jobs be decrerased?
Can map  / reduce tasks be reduced?

Kindly suggest .

Thanks and Best Regards
Vaibhav Negi

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