cw created HIVE-8192:
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Summary: Check DDL's writetype in DummyTxnManager
Key: HIVE-8192
URL: https://issues.apache.org/jira/browse/HIVE-8192
Project: Hive
Issue Type: Bug
Components: Locking
Affects Versions: 0.13.1, 0.13.0
Environment: hive0.13.1
Reporter: cw
Priority: Minor
Fix For: 0.14.0
The patch of HIVE-6734 added some DDL writetypes and checked DDL writetype in
DbTxnManager.java.
We use DummyTxnManager as the default value of hive.txn.manager in
hive-site.xml. We noticed that the operation of CREATE TEMPORARY FUNCTION has a
DLL_NO_LOCK writetype but it requires a EXCLUSIVE lock. If we try to create a
temporary function while there's a SELECT is processing at the same database,
then the console will print 'conflicting lock present for default mode
EXCLUSIVE' and the CREATE TEMPORARY FUNCTION operation won't get the lock until
the SELECT is done. Maybe it's a good idea to check the DDL's writetype in
DummyTxnManager too.
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