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
