Chaoyu Tang created HIVE-9199:
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Summary: Excessive exclusive lock used in some DDLs with
DummyTxnManager
Key: HIVE-9199
URL: https://issues.apache.org/jira/browse/HIVE-9199
Project: Hive
Issue Type: Bug
Components: Locking
Reporter: Chaoyu Tang
Assignee: Chaoyu Tang
In DummyTxnManager, the lockMode for a WriteEntity (e.g. database, table) is
determined by "complete" instead of its writeType. But since DDL output
WriteEntity is usually complete, some DDL operations might be given exclusive
locks which are actually not needed, which causes unnecessary locking
contention. For example, in createTable, DummyTxnManager suggests an exclusive
lock to table database writeentity since it is complete.
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