Gopal V created HIVE-16282:
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Summary: Semijoin: Disable slow-start for the bloom filter
aggregate task
Key: HIVE-16282
URL: https://issues.apache.org/jira/browse/HIVE-16282
Project: Hive
Issue Type: Bug
Affects Versions: 2.2.0
Reporter: Gopal V
The slow-start of the bloom filter vertex is a scheduling problem which causes
more pre-emption than is useful.
When the bloom filters are arranged as follows
Map 1(10 tasks)->Reducer 2(1 task)->Map 3(100 tasks)
Map 3 and Map 1 are immediately active since Reducer 2 -> Map 3 is a broadcast
edge.
Once 3 tasks in Map 1 finish, the engine kills one active task from Map 3 to
make room for Reducer 2.
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