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https://issues.apache.org/jira/browse/HIVE-15999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877617#comment-15877617
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Wei Zheng commented on HIVE-15999:
----------------------------------
I cannot find a good answer. As we discussed, this might be a derby bug.
One thing I noticed that is different for TestDbTxnManager2 from other tests is
that, all other tests call "TxnDbUtil.setConfValues(conf);" before calling
"TxnDbUtil.prepDb();", but TestDbTxnManager2 only calls
"TxnDbUtil.setConfValues(conf);" once in a @BeforeClass method. By changing the
@BeforeClass method into constructor, it's guaranteed to be run for every UT,
which is consistent to all other tests.
I ran the ptest several times, and didn't see such failure anymore with the fix.
> Fix flakiness in TestDbTxnManager2
> ----------------------------------
>
> Key: HIVE-15999
> URL: https://issues.apache.org/jira/browse/HIVE-15999
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 2.2.0
> Reporter: Wei Zheng
> Assignee: Wei Zheng
> Attachments: HIVE-15999.1.patch
>
>
> Right now there is test flakiness wrt. TestDbTxnManager2. The error is like
> this:
> {code}
> java.sql.SQLException: Table/View 'TXNS' already exists in Schema 'APP'.
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at
> org.apache.hadoop.hive.metastore.txn.TxnDbUtil.prepDb(TxnDbUtil.java:75)
> at
> org.apache.hadoop.hive.ql.lockmgr.TestDbTxnManager2.setUp(TestDbTxnManager2.java:90)
> {code}
> The failure is due to HiveConf used in the test being polluted by some test,
> e.g. in testDummyTxnManagerOnAcidTable(), conf entry HIVE_TXN_MANAGER is set
> to "org.apache.hadoop.hive.ql.lockmgr.DummyTxnManager" but not switched back.
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