Eugene Koifman created HIVE-11317:
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Summary: ACID: Improve transaction Abort logic due to timeout
Key: HIVE-11317
URL: https://issues.apache.org/jira/browse/HIVE-11317
Project: Hive
Issue Type: Bug
Components: Metastore, Transactions
Affects Versions: 1.0.0
Reporter: Eugene Koifman
Assignee: Eugene Koifman
the logic to Abort transactions that have stopped heartbeating is in
TxnHandler.timeOutTxns()
This is only called when DbTxnManger.getValidTxns() is called.
So if there is a lot of txns that need to be timed out and the there are not
SQL clients talking to the system, there is nothing to abort dead transactions,
and thus compaction can't clean them up so garbage accumulates in the system.
Also, streaming api doesn't call DbTxnManager at all.
Need to move this logic into Initiator (or some other metastore side thread).
Also, make sure it is broken up into multiple small(er) transactions against
metastore DB.
Also more timeOutLocks() locks there as well.
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