@Test
public void testCbHandlerLeakOnParticipantSessionExpiry() throws Exception {
// Logger.getRootLogger().setLevel(Level.INFO);
String className = TestHelper.getTestClassName();
String methodName = TestHelper.getTestMethodName();
String clusterName = className + "_" + methodName;
final int n = 2;
System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
TestHelper.setupCluster(
clusterName,
ZK_ADDR,
12918, // participant port
"localhost", // participant name prefix
"TestDB", // resource name prefix
1, // resources
32, // partitions per resource
n, // number of nodes
2, // replicas
"MasterSlave",
true); // do rebalance
final ClusterControllerManager controller =
new ClusterControllerManager(ZK_ADDR, clusterName, "controller_0");
controller.syncStart();
// start participants
MockParticipantManager[] participants = new MockParticipantManager[n];
for (int i = 0; i < n; i++) {
String instanceName = "localhost_" + (12918 + i);
participants[i] = new MockParticipantManager(ZK_ADDR, clusterName, instanceName);
participants[i].syncStart();
}
boolean result =
ClusterStateVerifier.verifyByZkCallback(
new ClusterStateVerifier.BestPossAndExtViewZkVerifier(ZK_ADDR, clusterName));
Assert.assertTrue(result);
final MockParticipantManager participantManagerToExpire = participants[1];
// check controller zk-watchers
result =
TestHelper.verify(
new TestHelper.Verifier() {
@Override
public boolean verify() throws Exception {
Map<String, Set<String>> watchers = ZkTestHelper.getListenersBySession(ZK_ADDR);
// Set<String> watchPaths = watchers.get("0x" + controllerManager.getSessionId());
Set<String> watchPaths = watchers.get("0x" + controller.getSessionId());
// System.out.println("controller watch paths: " + watchPaths);
// controller should have 5 + 2n + m + (m+2)n zk-watchers
// where n is number of nodes and m is number of resources
return watchPaths.size() == (6 + 5 * n);
}
},
500);
Assert.assertTrue(result, "Controller should have 6 + 5*n zk-watchers.");
// check participant zk-watchers
result =
TestHelper.verify(
new TestHelper.Verifier() {
@Override
public boolean verify() throws Exception {
Map<String, Set<String>> watchers = ZkTestHelper.getListenersBySession(ZK_ADDR);
Set<String> watchPaths =
watchers.get("0x" + participantManagerToExpire.getSessionId());
// System.out.println("participant watch paths: " + watchPaths);
// participant should have 2 zk-watchers: 1 for MESSAGE and 1 for CONTROLLER
return watchPaths.size() == 2;
}
},
500);
Assert.assertTrue(result, "Participant should have 2 zk-watchers.");
// check HelixManager#_handlers
// printHandlers(controllerManager);
// printHandlers(participantManagerToExpire);
int controllerHandlerNb = controller.getHandlers().size();
int particHandlerNb = participantManagerToExpire.getHandlers().size();
Assert.assertEquals(
controllerHandlerNb,
9,
"HelixController should have 9 (5+2n) callback handlers for 2 (n) participant");
Assert.assertEquals(
particHandlerNb, 2, "HelixParticipant should have 2 (msg+cur-state) callback handlers");
// expire the session of participant
System.out.println("Expiring participant session...");
String oldSessionId = participantManagerToExpire.getSessionId();
ZkTestHelper.expireSession(participantManagerToExpire.getZkClient());
String newSessionId = participantManagerToExpire.getSessionId();
System.out.println(
"Expried participant session. oldSessionId: "
+ oldSessionId
+ ", newSessionId: "
+ newSessionId);
result =
ClusterStateVerifier.verifyByPolling(
new ClusterStateVerifier.BestPossAndExtViewZkVerifier(ZK_ADDR, clusterName));
Assert.assertTrue(result);
// check controller zk-watchers
result =
TestHelper.verify(
new TestHelper.Verifier() {
@Override
public boolean verify() throws Exception {
Map<String, Set<String>> watchers = ZkTestHelper.getListenersBySession(ZK_ADDR);
Set<String> watchPaths = watchers.get("0x" + controller.getSessionId());
// System.out.println("controller watch paths after session expiry: " + watchPaths);
// controller should have 5 + 2n + m + (m+2)n zk-watchers
// where n is number of nodes and m is number of resources
return watchPaths.size() == (6 + 5 * n);
}
},
500);
Assert.assertTrue(result, "Controller should have 6 + 5*n zk-watchers after session expiry.");
// check participant zk-watchers
result =
TestHelper.verify(
new TestHelper.Verifier() {
@Override
public boolean verify() throws Exception {
Map<String, Set<String>> watchers = ZkTestHelper.getListenersBySession(ZK_ADDR);
Set<String> watchPaths =
watchers.get("0x" + participantManagerToExpire.getSessionId());
// System.out.println("participant watch paths after session expiry: " +
// watchPaths);
// participant should have 2 zk-watchers: 1 for MESSAGE and 1 for CONTROLLER
return watchPaths.size() == 2;
}
},
500);
Assert.assertTrue(result, "Participant should have 2 zk-watchers after session expiry.");
// check handlers
// printHandlers(controllerManager);
// printHandlers(participantManagerToExpire);
int handlerNb = controller.getHandlers().size();
Assert.assertEquals(
handlerNb,
controllerHandlerNb,
"controller callback handlers should not increase after participant session expiry");
handlerNb = participantManagerToExpire.getHandlers().size();
Assert.assertEquals(
handlerNb,
particHandlerNb,
"participant callback handlers should not increase after participant session expiry");
// clean up
controller.syncStop();
for (int i = 0; i < n; i++) {
participants[i].syncStop();
}
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}
