[ https://issues.apache.org/jira/browse/JCR-962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bertrand Delacretaz updated JCR-962: ------------------------------------ Attachment: 10-threads-dump.txt Deadlocked threads dump with 10 concurrent tasks > Deadlocks in ConcurrentVersioningWithTransactionsTest > ----------------------------------------------------- > > Key: JCR-962 > URL: https://issues.apache.org/jira/browse/JCR-962 > Project: Jackrabbit > Issue Type: Bug > Components: core > Reporter: Bertrand Delacretaz > Attachments: 10-threads-dump.txt, > JCR-962-ConcurrentVersioningWithTransactionsTest.patch > > > Patch follows for a ConcurrentVersioningWithTransactionsTest, based on the > existing ConcurrentVersioningTest but using transactions around the > versioning operations. > On my macbook, running the test with CONCURRENCY = 100 and NUM_OPERATIONS = > 100 causes a deadlock after a few seconds, thread dumps follow. > Note that I had to ignore StaleItemStateException (which is probably > justified, due to not locking stuff IIUC) to let the threads run long enough > to show the problem. > Running the test a few times showed the same locking pattern several times: > some threads are locked at line 87 (session.save(), no transaction) while > others are at line 93 (transaction.commit()), in > testConcurrentCheckinInTransaction(): > 80 public void testConcurrentCheckinInTransaction() throws > RepositoryException { > 81 runTask(new Task() { > 82 public void execute(Session session, Node test) throws > RepositoryException { > 83 int i = 0; > 84 try { > 85 Node n = test.addNode("test"); > 86 n.addMixin(mixVersionable); > 87 session.save(); > 88 for (i = 0; i < NUM_OPERATIONS / CONCURRENCY; i++) { > 89 final UserTransaction utx = new > UserTransactionImpl(test.getSession()); > 90 utx.begin(); > 91 n.checkout(); > 92 n.checkin(); > 93 utx.commit(); > 94 } > 95 n.checkout(); > 96 } catch (Exception e) { > 97 final String threadName = Thread.currentThread().getName(); > 98 final Throwable deepCause = getLevel2Cause(e); > 99 if(deepCause!=null && deepCause instanceof > StaleItemStateException) { > 100 // ignore > 101 } else { > 102 throw new RepositoryException(threadName + ", i=" + i + > ":" + e.getClass().getName(), e); > 103 } > 104 } > 105 } > 106 }, CONCURRENCY); > 107 } -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.