Hello apologize for the confusion. Here I will iterate the problem again.
I have two tables A, B which are partitioned on column X and bucketed (Same number of buckets) based on column Y. Table A is huge in terms of size (~135GB) and Table B is smaller table in terms of size (33GB). Both the tables has around 3.1 billion records.Storage format is ORC. I intended to a sort merger bucket map join hoping there no reducers will be spawned and the join will happen on map side. I have used the following settings. set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat; set hive.optimize.bucketmapjoin=true; set hive.optimize.bucketmapjoin.sortedmerge=true;set hive.enforce.sorting=true; Hive version 13. Any thoughts! Thanks, Murali On Jan 29, 2015, at 07:44 PM, matshyeq <matsh...@gmail.com> wrote: My hunch is while partitioning is in fact very similar to bucketing (actually superior as you have some control over what file data goes to) the hive optimizer only applies bucket joins if your tables are bucketed so your join condition t1.bucketed_column = t2.bucketed_column triggers the bucketed map join but t1.partitioned_column = t2.partitioned_column doesn't. I'm hoping someone with deeper Hive knowledge would be able to confirm this. Thank you, Kind Regards ~Maciek On Thu, Jan 29, 2015 at 1:51 PM, murali parimi <muralikrishna.par...@icloud.com> wrote: I faced the same situation where two tables with 3 billion records on each side and partitioned, sorted on same key. Set the following parameters in the hive query assuming the join will happen in the map phase. set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat; set hive.optimize.bucketmapjoin=true; set hive.optimize.bucketmapjoin.sortedmerge=true; set hive.enforce.sorting=true; I am using hive version 13 and the storage format is Orc. One of the table is small in size but I haven't checked whether irfan fit in the cache as we have huge memory. But the map sided join didn't happen. What could be the reason? Sent from my iPhone
On Jan 29, 2015, at 7:38 AM, matshyeq <matsh...@gmail.com> wrote: I do have two tables partitioned on the same criteria. Could I still take advantage of Bucket Map Join or better, Sort Merge Bucket Map Join? How? ~Maciek
