On 2-4-2017 15:23, Vlad Khorsun wrote: > 02.04.2017 14:59, Mark Rotteveel wrote: >> To come back to this again, there seems to be a concurrency bug in >> events posted by Firebird to the client. It looks like it overwrites >> local event ids (shared buffer, race condition?). >> >> This is triggered by running the entire Jaybird test suite. Running the >> specific test, TestFBEventManager.testLargeMultiLoad, in isolation >> significantly reduces the chance of it occurring.
[..] >> Any thoughts or ideas on this, or is it better if I just create a bug >> report? > > Ideally, reproducible test case needed. As simple, as possible. Also, we > could log every packet related to events on server side. I have built a sample application that reproduces it a little bit more consistently (although it still occasionally succeeds without a mismatch). Note that this doesn't include the logging I showed in this conversation, let me know if you need that. You can download it from https://www.dropbox.com/s/6jxfcadxtojodf8/event-race-condition-1.0-SNAPSHOT.zip?dl=0 Start with ./bin/event-race-condition --help for instructions. It requires Java 8. Playing around with the --threadCount and --insertsPerThread can help to improve predictability to reproduce it. I used the same number of threads as I have (HT) cores in my machine. Using more inserts per thread can also increase the chance of it eventually occurring. defaults are: private static String hostName = "localhost"; private static int portNumber = 3050; private static String databasePath = "D:/data/db/fb3/eventrace.fdb"; private static String user = "sysdba"; private static String password = "masterkey"; private static int threadCount = 8; private static int insertsPerThread = 200; Full project: https://github.com/mrotteveel/event-race-condition -- Mark Rotteveel ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
