void printZkListeners(ZkClient client) throws Exception {
Map<String, Set<IZkDataListener>> datalisteners = ZkTestHelper.getZkDataListener(client);
Map<String, Set<IZkChildListener>> childListeners = ZkTestHelper.getZkChildListener(client);
System.out.println("dataListeners {");
for (String path : datalisteners.keySet()) {
System.out.println("\t" + path + ": ");
Set<IZkDataListener> set = datalisteners.get(path);
for (IZkDataListener listener : set) {
CallbackHandler handler = (CallbackHandler) listener;
System.out.println("\t\t" + handler.getListener());
}
}
System.out.println("}");
System.out.println("childListeners {");
for (String path : childListeners.keySet()) {
System.out.println("\t" + path + ": ");
Set<IZkChildListener> set = childListeners.get(path);
for (IZkChildListener listener : set) {
CallbackHandler handler = (CallbackHandler) listener;
System.out.println("\t\t" + handler.getListener());
}
}
System.out.println("}");
}
@Test
public void testRemoveUserCbHandlerOnPathRemoval() throws Exception {
String className = TestHelper.getTestClassName();
String methodName = TestHelper.getTestMethodName();
String clusterName = className + "_" + methodName;
final int n = 3;
final String zkAddr = ZK_ADDR;
System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
TestHelper.setupCluster(
clusterName,
zkAddr,
12918,
"localhost",
"TestDB",
1, // resource
32, // partitions
n, // nodes
2, // replicas
"MasterSlave",
true);
final ClusterControllerManager controller =
new ClusterControllerManager(zkAddr, clusterName, "controller_0");
controller.syncStart();
MockParticipantManager[] participants = new MockParticipantManager[n];
for (int i = 0; i < n; i++) {
String instanceName = "localhost_" + (12918 + i);
participants[i] = new MockParticipantManager(zkAddr, clusterName, instanceName);
participants[i].syncStart();
// register a controller listener on participant_0
if (i == 0) {
// ZkHelixTestManager manager = participants[0].getManager();
MockParticipantManager manager = participants[0];
manager.addCurrentStateChangeListener(
new CurrentStateChangeListener() {
@Override
public void onStateChange(
String instanceName,
List<CurrentState> statesInfo,
NotificationContext changeContext) {
// To change body of implemented methods use File | Settings | File Templates.
// System.out.println(instanceName + " on current-state change, type: " +
// changeContext.getType());
}
},
manager.getInstanceName(),
manager.getSessionId());
}
}
Boolean result =
ClusterStateVerifier.verifyByZkCallback(
new ClusterStateVerifier.BestPossAndExtViewZkVerifier(zkAddr, clusterName));
Assert.assertTrue(result);
MockParticipantManager participantToExpire = participants[0];
String oldSessionId = participantToExpire.getSessionId();
PropertyKeyBuilder keyBuilder = new PropertyKeyBuilder(clusterName);
// check manager#hanlders
Assert.assertEquals(
participantToExpire.getHandlers().size(),
3,
"Should have 3 handlers: CURRENTSTATE/{sessionId}, CONTROLLER, and MESSAGES");
// check zkclient#listeners
Map<String, Set<IZkDataListener>> dataListeners =
ZkTestHelper.getZkDataListener(participantToExpire.getZkClient());
Map<String, Set<IZkChildListener>> childListeners =
ZkTestHelper.getZkChildListener(participantToExpire.getZkClient());
// printZkListeners(participantToExpire.getZkClient());
Assert.assertEquals(
dataListeners.size(),
1,
"Should have 1 path (CURRENTSTATE/{sessionId}/TestDB0) which has 1 data-listeners");
String path =
keyBuilder
.currentState(participantToExpire.getInstanceName(), oldSessionId, "TestDB0")
.getPath();
Assert.assertEquals(
dataListeners.get(path).size(), 1, "Should have 1 data-listeners on path: " + path);
Assert.assertEquals(
childListeners.size(),
3,
"Should have 3 paths (CURRENTSTATE/{sessionId}, CONTROLLER, and MESSAGES) each of which has 1 child-listener");
path = keyBuilder.currentStates(participantToExpire.getInstanceName(), oldSessionId).getPath();
Assert.assertEquals(
childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
path = keyBuilder.messages(participantToExpire.getInstanceName()).getPath();
Assert.assertEquals(
childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
path = keyBuilder.controller().getPath();
Assert.assertEquals(
childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
// check zookeeper#watches on client side
Map<String, List<String>> watchPaths =
ZkTestHelper.getZkWatch(participantToExpire.getZkClient());
// System.out.println("localhost_12918 zk-client side watchPaths: " + watchPaths + "\n");
Assert.assertEquals(
watchPaths.get("dataWatches").size(),
4,
"Should have 4 data-watches: CURRENTSTATE/{sessionId}, CURRENTSTATE/{sessionId}/TestDB, CONTROLLER, MESSAGES");
Assert.assertEquals(
watchPaths.get("childWatches").size(),
3,
"Should have 3 child-watches: CONTROLLER, MESSAGES, and CURRENTSTATE/{sessionId}");
// expire localhost_12918
System.out.println(
"Expire participant: "
+ participantToExpire.getInstanceName()
+ ", session: "
+ participantToExpire.getSessionId());
ZkTestHelper.expireSession(participantToExpire.getZkClient());
String newSessionId = participantToExpire.getSessionId();
System.out.println(
participantToExpire.getInstanceName()
+ " oldSessionId: "
+ oldSessionId
+ ", newSessionId: "
+ newSessionId);
result =
ClusterStateVerifier.verifyByZkCallback(
new ClusterStateVerifier.BestPossAndExtViewZkVerifier(zkAddr, clusterName));
Assert.assertTrue(result);
// check manager#hanlders
Assert.assertEquals(
participantToExpire.getHandlers().size(),
2,
"Should have 2 handlers: CONTROLLER and MESSAGES. CURRENTSTATE/{sessionId} handler should be removed by CallbackHandler#handleChildChange()");
// check zkclient#listeners
dataListeners = ZkTestHelper.getZkDataListener(participantToExpire.getZkClient());
childListeners = ZkTestHelper.getZkChildListener(participantToExpire.getZkClient());
// printZkListeners(participantToExpire.getZkClient());
Assert.assertTrue(dataListeners.isEmpty(), "Should have no data-listeners");
Assert.assertEquals(
childListeners.size(),
3,
"Should have 3 paths (CURRENTSTATE/{oldSessionId}, CONTROLLER, and MESSAGES). "
+ "CONTROLLER and MESSAGE has 1 child-listener each. CURRENTSTATE/{oldSessionId} doesn't have listener (ZkClient doesn't remove empty childListener set. probably a ZkClient bug. see ZkClient#unsubscribeChildChange())");
path = keyBuilder.currentStates(participantToExpire.getInstanceName(), oldSessionId).getPath();
Assert.assertEquals(
childListeners.get(path).size(), 0, "Should have no child-listener on path: " + path);
path = keyBuilder.messages(participantToExpire.getInstanceName()).getPath();
Assert.assertEquals(
childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
path = keyBuilder.controller().getPath();
Assert.assertEquals(
childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
// check zookeeper#watches on client side
watchPaths = ZkTestHelper.getZkWatch(participantToExpire.getZkClient());
// System.out.println("localhost_12918 zk-client side watchPaths: " + watchPaths + "\n");
Assert.assertEquals(
watchPaths.get("dataWatches").size(),
2,
"Should have 2 data-watches: CONTROLLER and MESSAGES");
Assert.assertEquals(
watchPaths.get("childWatches").size(),
2,
"Should have 2 child-watches: CONTROLLER and MESSAGES");
Assert.assertEquals(
watchPaths.get("existWatches").size(),
2,
"Should have 2 exist-watches: CURRENTSTATE/{oldSessionId} and CURRENTSTATE/{oldSessionId}/TestDB0");
// another session expiry on localhost_12918 should clear the two exist-watches on
// CURRENTSTATE/{oldSessionId}
System.out.println(
"Expire participant: "
+ participantToExpire.getInstanceName()
+ ", session: "
+ participantToExpire.getSessionId());
ZkTestHelper.expireSession(participantToExpire.getZkClient());
result =
ClusterStateVerifier.verifyByZkCallback(
new ClusterStateVerifier.BestPossAndExtViewZkVerifier(zkAddr, clusterName));
Assert.assertTrue(result);
// check zookeeper#watches on client side
watchPaths = ZkTestHelper.getZkWatch(participantToExpire.getZkClient());
// System.out.println("localhost_12918 zk-client side watchPaths: " + watchPaths + "\n");
Assert.assertEquals(
watchPaths.get("dataWatches").size(),
2,
"Should have 2 data-watches: CONTROLLER and MESSAGES");
Assert.assertEquals(
watchPaths.get("childWatches").size(),
2,
"Should have 2 child-watches: CONTROLLER and MESSAGES");
Assert.assertEquals(
watchPaths.get("existWatches").size(),
0,
"Should have no exist-watches. exist-watches on CURRENTSTATE/{oldSessionId} and CURRENTSTATE/{oldSessionId}/TestDB0 should be cleared during handleNewSession");
// Thread.sleep(1000);
// clean up
controller.syncStop();
for (int i = 0; i < n; i++) {
participants[i].syncStop();
}
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}