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https://issues.apache.org/jira/browse/JENA-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151991#comment-13151991
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Paolo Castagna commented on JENA-161:
-------------------------------------
Thank you Laurent.
Using Laurent's test with debug enabled we see the problem described by Andy,
for example:
11:15:20 DEBUG TDB :: Txn[30]/R: start
11:15:20 DEBUG TDB :: Txn[31]/W: begin
11:15:20 DEBUG TDB :: Txn[31]/W: commit
11:15:20 DEBUG TDB :: Txn[31]/W: Queue commit flush
11:15:20 DEBUG TDB :: Txn[32]/R: start
11:15:20 DEBUG TDB :: Txn[32]/R: finish
11:15:20 DEBUG TDB :: Txn[32]/R: Pending transactions:
R=1 / W=0
11:15:20 DEBUG TDB :: Txn[33]/R: start
11:15:20 DEBUG TDB :: Txn[33]/R: finish
11:15:20 DEBUG TDB :: Txn[33]/R: Pending transactions:
R=1 / W=0
11:15:20 DEBUG TDB :: Txn[34]/W: begin
11:15:20 DEBUG TDB :: Txn[34]/W: commit
11:15:20 DEBUG TDB :: Txn[34]/W: Queue commit flush
11:15:20 DEBUG TDB :: Txn[35]/R: start
11:15:20 DEBUG TDB :: Txn[35]/R: finish
11:15:20 DEBUG TDB :: Txn[35]/R: Pending transactions:
R=1 / W=0
11:15:20 DEBUG TDB :: Txn[36]/W: begin
11:15:20 DEBUG TDB :: Txn[30]/R: finish
11:15:20 DEBUG TDB :: Txn[30]/R: Pending transactions:
R=0 / W=1
11:15:20 DEBUG TDB :: Txn[37]/R: start
11:15:20 DEBUG TDB :: Txn[36]/W: commit
11:15:20 DEBUG TDB :: Txn[36]/W: Queue commit flush
11:15:20 DEBUG TDB :: Txn[37]/R: finish
11:15:20 DEBUG TDB :: Txn[31]/W: Flush delayed commit
11:15:20 DEBUG TDB :: Txn[34]/W: Flush delayed commit
11:15:20 DEBUG TDB :: Txn[36]/W: Flush delayed commit
> TDB Transaction deadlock
> ------------------------
>
> Key: JENA-161
> URL: https://issues.apache.org/jira/browse/JENA-161
> Project: Jena
> Issue Type: Bug
> Components: TDB
> Affects Versions: TDB 0.9.0
> Environment: Windows 7 64 bit. I am using the snapshot of SVN of 10
> November 2011
> Reporter: Simon Helsen
> Assignee: Andy Seaborne
> Attachments: TDBTxnDeadlockTest.java
>
>
> While running some tests I ran into a deadlock. Unfortunately, on my 64 bit
> windows 7, I was unable to trigger the complete stack trace. (there is no
> equivalent of kill -3 and all known utilities to achieve this on windows
> don't work with a 64 bit process). I was able to see two of the threads which
> were hanging (because of a UI view in our admin console), but it is not
> showing the other threads (which I'd need to see why the 2 threads I do have
> are hanging). I will show the 2 threads which are hanging here in the hope it
> rings a bell. I hope I will be able to get a full set of stack traces at some
> point
> as for an analysis: Not sure if we are dealing with a double-crossed locking
> issue here. It seems that thread 2 is waiting for thread 1 who clearly has
> the lock on the transaction manager, but it is not clear why it is waiting on
> the Transaction object. It seems that some other thread still has it and the
> question is whether thread 2 could be the one (so there is a crossing of the
> locks)? It would surprise me because thread 1 is doing a READ transaction and
> thread 2 is doing a separate WRITE transaction.
> thread 1:
> ------------
> com.hp.hpl.jena.tdb.transaction.Transaction.signalEnacted(Transaction.java:178)
>
> com.hp.hpl.jena.tdb.transaction.TransactionManager.enactTransaction(TransactionManager.java:384)
>
> com.hp.hpl.jena.tdb.transaction.TransactionManager.processDelayedReplayQueue(TransactionManager.java:419)
>
> com.hp.hpl.jena.tdb.transaction.TransactionManager$TSM_WriteBackEndTxn.readerFinishes(TransactionManager.java:189)
>
> com.hp.hpl.jena.tdb.transaction.TransactionManager.readerFinishes(TransactionManager.java:609)
>
> com.hp.hpl.jena.tdb.transaction.TransactionManager.noteTxnCommit(TransactionManager.java:472)
>
> com.hp.hpl.jena.tdb.transaction.TransactionManager.notifyCommit(TransactionManager.java:349)
> com.hp.hpl.jena.tdb.transaction.Transaction.commit(Transaction.java:100)
> com.hp.hpl.jena.tdb.transaction.Transaction.close(Transaction.java:151)
> com.hp.hpl.jena.tdb.DatasetGraphTxn.close(DatasetGraphTxn.java:55)
>
> com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTdbTxProvider.storeOperation(JenaTdbTxProvider.java:179)
> <snip>
> thread 2
> ------------
> com.hp.hpl.jena.tdb.transaction.TransactionManager.notifyClose(TransactionManager.java:445)
> com.hp.hpl.jena.tdb.transaction.Transaction.close(Transaction.java:162)
> com.hp.hpl.jena.tdb.DatasetGraphTxn.close(DatasetGraphTxn.java:55)
>
> com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTdbTxProvider.storeOperation(JenaTdbTxProvider.java:285)
>
> com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTdbTxProvider.unprotectedDelete(JenaTdbTxProvider.java:1902)
>
> com.ibm.team.jfs.rdf.internal.jena.tdb.JenaTdbTxProvider.delete(JenaTdbTxProvider.java:664)
> <snip>
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