@Override
      public void run() {
        synchronized (doTestDisconnectCleanup_Listener.CONTROL_LOCK) {
          doTestDisconnectCleanup_Listener.CONTROL_LOCK.notifyAll();
        }
      }
Make sure a disconnect causes queue memory to be released.
geode-core/src/distributedTest/java/org/apache/geode/cache30/SlowRecDUnitTest.java