[infinispan-issues] [JBoss JIRA] (ISPN-2081) Transaction leak caused by reordering between prepare and rollback

Transaction leak caused by reordering between prepare and rollback ------------------------------------------------------------------ Key: ISPN-2081 URL: https://issues.jboss.org/browse/ISPN-2081 Project: Infinispan Issue Type: Bug Components: Transactions Affects Versions: 5.1.5.FINAL Reporter: Mircea Markus Assignee: Mircea Markus Priority: Blocker Labels: jdg, jdg6 Fix For: 5.2.0.CR1, 5.2.0.Final Attachments: DistL1WriteSkewTest.txt, RollbackNotSentBeforePrepareTest.java There's no ordering between the prepare and commit/rollback messages, as the later are sent OOB. With this in mind, the following transaction leak might happen: Tx1 send prepare on nodes {A,B} 1. the message reaches A and timeouts but hasn't yet been processed on B 2. The transaction originator reacts immediately to the timeout received from A without waiting the response from B and sends a rollback request 3. The rollback request is processed on A and B 4. The initial prepare is then processed on B At this point we have an orphan transaction prepare on B. Whilst this is not causing any inconsistencies, it keeps keys locked indefinitely and is a memory leak. The solution would be to wait at 2 for all the prepare messages *before* sending the rollback. Attached is a unit test to reproduce the issue. Related mailing list thread: http://infinispan.markmail.org/search/#query:%20list%3Aorg.jboss.lists.in...