@Test
public void testSemaphoreSplitBrain() throws InterruptedException {
Config config = newConfig();
HazelcastInstance h1 = Hazelcast.newHazelcastInstance(config);
HazelcastInstance h2 = Hazelcast.newHazelcastInstance(config);
final HazelcastInstance h3 = Hazelcast.newHazelcastInstance(config);
final String key = generateKeyOwnedBy(h3);
ISemaphore semaphore = h3.getSemaphore(key);
semaphore.init(5);
semaphore.acquire(3);
assertEquals(2, semaphore.availablePermits());
assertTrueEventually(
new AssertTask() {
@Override
public void run() throws Exception {
assertTrue(h3.getPartitionService().isLocalMemberSafe());
}
});
TestMemberShipListener memberShipListener = new TestMemberShipListener(2);
h3.getCluster().addMembershipListener(memberShipListener);
TestLifeCycleListener lifeCycleListener = new TestLifeCycleListener(1);
h3.getLifecycleService().addLifecycleListener(lifeCycleListener);
closeConnectionBetween(h1, h3);
closeConnectionBetween(h2, h3);
assertOpenEventually(memberShipListener.latch);
assertClusterSizeEventually(2, h1);
assertClusterSizeEventually(2, h2);
assertClusterSizeEventually(1, h3);
final ISemaphore semaphore1 = h1.getSemaphore(key);
// when member is down, permits are released.
// since releasing the permits is async, we use assert eventually
assertTrueEventually(
new AssertTask() {
@Override
public void run() throws Exception {
assertEquals(5, semaphore1.availablePermits());
}
});
semaphore1.acquire(4);
assertOpenEventually(lifeCycleListener.latch);
assertClusterSizeEventually(3, h1);
assertClusterSizeEventually(3, h2);
assertClusterSizeEventually(3, h3);
ISemaphore testSemaphore = h3.getSemaphore(key);
assertEquals(1, testSemaphore.availablePermits());
}
