Navis created HIVE-3270:
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Summary: SMBJoin should be applied atomically
Key: HIVE-3270
URL: https://issues.apache.org/jira/browse/HIVE-3270
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Navis
Priority: Minor
For using smbjoin, mapjoin hint(/*+MAPJOIN(..)*/) + bucket mapjoin
configuration(hive.optimize.bucketmapjoin) also should be preceded.
But when BucketMapJoinOptimizer or SortedMergeBucketMapJoinOptimizer fails to
convert mapjoin to smbjoin by some reason, it will be executed as a (bucket)
mapjoin, which possibly cause OOM in map task.
I think there should be a hint for SMBJoin, which tries to convert common-join
to smbjoin and when it fails, simply fallbacks to common-join.
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