0 Replies Latest reply: Nov 14, 2011 12:26 PM by Anton K RSS

    JBoss cache. Concurrency issue

    Anton K Newbie

      I'm using JBossCache 'Malagueta' 3.2.0.GA

      I faced with strange issue in production environment, sometimes writes to jboss are lost. I tried to reproduce this situation with simple java application

      public static void testCache() {
         
      Cache cache = new DefaultCacheFactory().createCache(false);
          cache
      .create();
          cache
      .start();
         
      final Node node = cache.getRoot().addChild(Fqn.fromString("/child1"));
         
      int threadsCount = 20;
         
      final CyclicBarrier b = new CyclicBarrier(threadsCount);
         
      for (int i = 0; i < threadsCount; i++) {
             
      final long j = i;
             
      new Thread(new Runnable() {
                 
      @Override
                 
      public void run() {
                     
      try {
                          b
      .await();
                         
      String name = RandomGenerator.getRandomName(4);
                          node
      .put(j, name);
                         
      String nameFromCache = (String) node.get(j);
                         
      if (!name.equals(nameFromCache)) {
                             
      System.out.println("error");
                         
      }
                     
      } catch (Exception e) {
                          e
      .printStackTrace();
                     
      }
                 
      }
             
      }).start();
         
      }
      }

      From time to time, this test output "error", which i run from static void mai. 1 of 3 runs return "error" msg, node simply return "null".  I can't reproduce it on every machine