PARTITION_NUM, // partitions per resource
N, // number of nodes
2, // replicas
"MasterSlave", true); // do rebalance
MockController controller =
new MockController(_zkaddr, clusterName, "controller");
controller.syncStart();
// start participants
Map<String, MockParticipant> participants =
new HashMap<String, MockParticipant>();
Map<String, HelixCustomCodeRunner> customCodeRunners =
new HashMap<String, HelixCustomCodeRunner>();
Map<String, DummyCallback> callbacks = new HashMap<String, DummyCallback>();
for (int i = 0; i < N; i++) {
String instanceName = "localhost_" + (12918 + i);
participants
.put(instanceName, new MockParticipant(_zkaddr, clusterName, instanceName));
customCodeRunners.put(instanceName, new HelixCustomCodeRunner(participants.get(instanceName),
_zkaddr));
callbacks.put(instanceName, new DummyCallback());
customCodeRunners.get(instanceName).invoke(callbacks.get(instanceName))
.on(ChangeType.LIVE_INSTANCE).usingLeaderStandbyModel("TestParticLeader").start();
participants.get(instanceName).syncStart();
}
boolean result =
ClusterStateVerifier
.verifyByZkCallback(new ClusterStateVerifier.BestPossAndExtViewZkVerifier(_zkaddr,
clusterName));
Assert.assertTrue(result);
// Make sure callback is registered
BaseDataAccessor<ZNRecord> baseAccessor = new ZkBaseDataAccessor<ZNRecord>(_zkclient);
final HelixDataAccessor accessor = new ZKHelixDataAccessor(clusterName, baseAccessor);
PropertyKey.Builder keyBuilder = accessor.keyBuilder();
final String customCodeRunnerResource =
customCodeRunners.get("localhost_12918").getResourceName();
ExternalView extView = accessor.getProperty(keyBuilder.externalView(customCodeRunnerResource));
Map<String, String> instanceStates = extView.getStateMap(customCodeRunnerResource + "_0");
String leader = null;
for (String instance : instanceStates.keySet()) {
String state = instanceStates.get(instance);
if ("LEADER".equals(state)) {
leader = instance;
break;
}
}
Assert.assertNotNull(leader);
for (String instance : callbacks.keySet()) {
DummyCallback callback = callbacks.get(instance);
if (instance.equals(leader)) {
Assert.assertTrue(callback.isInitTypeInvoked());
} else {
Assert.assertFalse(callback.isInitTypeInvoked());
}
callback.reset();
}
// Disable custom-code runner resource
HelixAdmin admin = new ZKHelixAdmin(_zkclient);
admin.enableResource(clusterName, customCodeRunnerResource, false);
// Verify that states of custom-code runner are all OFFLINE
result = TestHelper.verify(new TestHelper.Verifier() {
@Override
public boolean verify() throws Exception {
PropertyKey.Builder keyBuilder = accessor.keyBuilder();
ExternalView extView =
accessor.getProperty(keyBuilder.externalView(customCodeRunnerResource));
if (extView == null) {
return false;
}
Set<String> partitionSet = extView.getPartitionSet();
if (partitionSet == null || partitionSet.size() != PARTITION_NUM) {
return false;
}
for (String partition : partitionSet) {
Map<String, String> instanceStates = extView.getStateMap(partition);
for (String state : instanceStates.values()) {
if (!"OFFLINE".equals(state)) {
return false;
}
}
}
return true;
}
}, 10 * 1000);
Assert.assertTrue(result);
// Change live-instance should not invoke any custom-code runner
LiveInstance fakeInstance = new LiveInstance("fakeInstance");
fakeInstance.setSessionId("fakeSessionId");
fakeInstance.setHelixVersion("0.6");
accessor.setProperty(keyBuilder.liveInstance("fakeInstance"), fakeInstance);
Thread.sleep(1000);
for (Map.Entry<String, DummyCallback> e : callbacks.entrySet()) {
String instance = e.getKey();
DummyCallback callback = e.getValue();
Assert.assertFalse(callback.isInitTypeInvoked());
Assert.assertFalse(callback.isCallbackTypeInvoked());
// Ensure that we were told that a leader stopped being the leader
if (instance.equals(leader)) {
Assert.assertTrue(callback.isFinalizeTypeInvoked());
}
}
// Remove fake instance
accessor.removeProperty(keyBuilder.liveInstance("fakeInstance"));
// Re-enable custom-code runner
admin.enableResource(clusterName, customCodeRunnerResource, true);
result =
ClusterStateVerifier
.verifyByZkCallback(new ClusterStateVerifier.BestPossAndExtViewZkVerifier(_zkaddr,
clusterName));
Assert.assertTrue(result);
// Verify that custom-invoke is invoked again
extView = accessor.getProperty(keyBuilder.externalView(customCodeRunnerResource));
instanceStates = extView.getStateMap(customCodeRunnerResource + "_0");
leader = null;
for (String instance : instanceStates.keySet()) {
String state = instanceStates.get(instance);
if ("LEADER".equals(state)) {
leader = instance;
break;
}
}
Assert.assertNotNull(leader);
for (String instance : callbacks.keySet()) {
DummyCallback callback = callbacks.get(instance);
if (instance.equals(leader)) {
Assert.assertTrue(callback.isInitTypeInvoked());
} else {
Assert.assertFalse(callback.isInitTypeInvoked());
}
callback.reset();
}
// Add a fake instance should invoke custom-code runner
accessor.setProperty(keyBuilder.liveInstance("fakeInstance"), fakeInstance);
Thread.sleep(1000);
for (String instance : callbacks.keySet()) {
DummyCallback callback = callbacks.get(instance);
if (instance.equals(leader)) {
Assert.assertTrue(callback.isCallbackTypeInvoked());
} else {
Assert.assertFalse(callback.isCallbackTypeInvoked());
}
}
// Clean up
controller.syncStop();
for (MockParticipant participant : participants.values()) {
participant.syncStop();
}
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));