Github user SaintBacchus commented on the pull request:
https://github.com/apache/spark/pull/7889#issuecomment-131079850
@zsxwing hive had a configuration named
`hive.server2.thrift.max.worker.threads` which had already limit the
concurrence.
But my problem was not caused by `trimSessionIfNecessary `.
In high concurrence, `onStatementStart ` will be executed before the
`onSessionCreated `. which cause this problem.
As this patch had conflicts with master, I will test it again.
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