Daniel Dai created HIVE-19813:
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Summary: SessionState.start don't have to be synchronized
Key: HIVE-19813
URL: https://issues.apache.org/jira/browse/HIVE-19813
Project: Hive
Issue Type: Bug
Reporter: Daniel Dai
Assignee: Daniel Dai
This is introduced in HIVE-14690. However, only check-set block needs to be
synchronized, not the whole block. The method will start Tez AM, which is a
long operation. Make the method synchronized will serialize session start thus
slow down hs2.
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