Rajesh Balamohan created TEZ-4209:
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Summary: Use task counter information to compute keycount during
hashtable loading
Key: TEZ-4209
URL: https://issues.apache.org/jira/browse/TEZ-4209
Project: Apache Tez
Issue Type: Bug
Reporter: Rajesh Balamohan
There are cases when compiler misestimates key count and this results in a
number of hashtable resizes during runtime.
[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/fast/VectorMapJoinFastHashTableLoader.java#L128]
In such cases, it would be good to get "approximate_input_records" (TEZ-4207)
counter from upstream to compute the key count more accurately at runtime.
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