[jira] [Created] (DERBY-6977) Autogenerated index name occasionally generates a name which already exists

["Trejkaz (JIRA)" <ji...@apache.org>]

Trejkaz created DERBY-6977:
------------------------------

             Summary: Autogenerated index name occasionally generates a name which already exists
                 Key: DERBY-6977
                 URL: https://issues.apache.org/jira/browse/DERBY-6977
             Project: Derby
          Issue Type: Bug
    Affects Versions: 10.13.1.1
            Reporter: Trejkaz


This has been happening for as long as I can remember, but v10.13.1.1 is the version we're currently at and I still see builds fail at random due to this.

In a migration, we execute this statement:

{noformat}
CREATE TABLE GuidMappingCache (
    guidhigh  BIGINT NOT NULL,
    guidlow BIGINT NOT NULL,
    luceneid INTEGER NOT NULL,
    PRIMARY KEY (guidhigh, guidlow)
)
{noformat}

This randomly fails with the following sort of error:

{noformat}
Caused by: java.sql.SQLException: Index 'SQL171110050418720' already exists in Schema 'APP'.
	at org.apache.derby.impl.jdbc.SQLExceptionFactory.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 OurCode.execute(...)
Caused by: ERROR X0Y32: Index 'SQL171110050418720' already exists in Schema 'APP'.
	at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
	at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.duplicateDescriptorException(Unknown Source)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.addDescriptor(Unknown Source)
	at org.apache.derby.impl.sql.execute.CreateIndexConstantAction.executeConstantAction(Unknown Source)
	at org.apache.derby.impl.sql.execute.CreateConstraintConstantAction.executeConstantAction(Unknown Source)
	at org.apache.derby.impl.sql.execute.CreateTableConstantAction.executeConstantAction(Unknown Source)
	at org.apache.derby.impl.sql.execute.MiscResultSet.open(Unknown Source)
	at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
	at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
	... 37 more
{noformat}

The last time someone was looking into this, it was somehow very reproducible for them but not for anyone else. I'm now seeing it occasionally on tests on our build farm. As usual, no matter how many times I run the test here, I can't get the same failure to occur.

How is this value being generated?



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