Gopal V created HIVE-4103:
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Summary: Remove System.gc() call from the map-join local-task loop
Key: HIVE-4103
URL: https://issues.apache.org/jira/browse/HIVE-4103
Project: Hive
Issue Type: Bug
Reporter: Gopal V
Hive's HashMapWrapper calls System.gc() twice within the
HashMapWrapper::isAbort() which produces a significant slow-down during the
loop.
{code}
2013-03-01 04:54:28 The gc calls took 677 ms
2013-03-01 04:54:28 Processing rows: 200000 Hashtable size: 199999
Memory usage: 62955432 rate: 0.033
2013-03-01 04:54:31 The gc calls took 956 ms
2013-03-01 04:54:31 Processing rows: 300000 Hashtable size: 299999
Memory usage: 90826656 rate: 0.048
2013-03-01 04:54:33 The gc calls took 967 ms
2013-03-01 04:54:33 Processing rows: 384160 Hashtable size: 384160
Memory usage: 114412712 rate: 0.06
{code}
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