Eugene Koifman created HIVE-12686:
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Summary: TxnHandler.checkLock(CheckLockRequest) perf improvements
Key: HIVE-12686
URL: https://issues.apache.org/jira/browse/HIVE-12686
Project: Hive
Issue Type: Bug
Components: Transactions
Affects Versions: 1.3.0
Reporter: Eugene Koifman
Assignee: Eugene Koifman
CheckLockRequest should include txnid since the caller should always know this
(if there is a txn).
This would make getTxnIdFromLockId() call unnecessary.
checkLock() is usually called much more often (especially at the beginning of
exponential back off sequence), thus a lot of these heartbeats are overkill.
In fact, if we made heartbeat in DbTxnManager start right after locks in "W"
state are inserted, heartbeat in checkLock() would not be needed at all.
This would be the best solution but need to make sure that heartbeating is
started appropriately in Streaming API - currently it does not. It requires
the client to start heartbeating.
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