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https://issues.apache.org/jira/browse/DERBY-3354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568177#action_12568177
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Kathey Marsden commented on DERBY-3354:
---------------------------------------
Thanks for the patch. I tried it out and it and have a few comments.
1) In EmbedBlob should the call to localConn.removeLOBMapping(locator); be in
a finally block like it is in EmbedClob?
2) In jdk15 we don't have free() so would still have a leak. Do you have any
suggestions for a jdk15 solution?
3) I removed the call to free() from the repro and ran
java LocLeak and got.
Retrieving row 99000
Exception in thread "main" java.sql.SQLException: Java exception: ':
java.util.ConcurrentModificationException'.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:95)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:88)
at org.apache.derby.impl.jdbc.Util.javaException(Util.java:245)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:403)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(TransactionResourceImpl.java:346)
at
org.apache.derby.impl.jdbc.EmbedConnection.handleException(EmbedConnection.java:1946)
at
org.apache.derby.impl.jdbc.EmbedConnection.rollback(EmbedConnection.java:1521)
at LocLeak.main(LocLeak.java:14)
Caused by: java.sql.SQLException: Java exception: ':
java.util.ConcurrentModificationException'.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:13
5)
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
... 7 more
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$ValueIterator.next(HashMap.java:821)
at
org.apache.derby.impl.jdbc.EmbedConnection.clearLOBMapping(EmbedConnection.java:2737)
at
org.apache.derby.impl.jdbc.EmbedConnection.rollback(EmbedConnection.java:1519)
... 1 more
> Select from large lob table with embedded gives OutOfMemoryError
> ----------------------------------------------------------------
>
> Key: DERBY-3354
> URL: https://issues.apache.org/jira/browse/DERBY-3354
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.3.1.4, 10.3.2.1, 10.4.0.0
> Reporter: Kathey Marsden
> Attachments: derby-3354.diff, LocLeak.java
>
>
> Retrieving from a large table with lobs gives an OutOfMemoryException, even
> if free() is explictly called on the lob. I believe this is because
> EmbedConnection.addLobMapping is called for every lob creation but is never
> cleared until commit or rollback, even if the lob is freed.
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