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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6977) Autogenerated index name occasionally generates a name which already exists
Date Sun, 12 Nov 2017 21:29:00 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248994#comment-16248994
] 

Rick Hillegas commented on DERBY-6977:
--------------------------------------

I believe that I have discovered the reason for the convoluted logic. It is explained in a
comment in https://issues.apache.org/jira/browse/DERBY-6974. Search for IBM bug number 5622.
The logic was added because the original Cloudscape constraint names (which were probably
UUIDs) were too long to be db2-compatible.

> 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
>         Attachments: derby-6977-01-aa-useUUID.diff, derby-6977-01-ab-useUUID.diff
>
>
> 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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