pkuwm commented on a change in pull request #1450:
URL: https://github.com/apache/helix/pull/1450#discussion_r501250700



##########
File path: helix-core/src/test/java/org/apache/helix/TestHelper.java
##########
@@ -799,7 +799,12 @@ public static boolean verify(Verifier verifier, long 
timeout) throws Exception {
     long start = System.currentTimeMillis();
     do {
       boolean result = verifier.verify();
-      if (result || (System.currentTimeMillis() - start) > timeout) {
+      boolean isTimedout = (System.currentTimeMillis() - start) > timeout;
+      if (result || isTimedout) {
+        if (isTimedout && !result) {
+          LOG.error("verifier time out, consider try longer timeout, stack 
trace{}",
+              Arrays.asList(Thread.currentThread().getStackTrace()));

Review comment:
       This stack trace would be printed in one line, right? It'd be difficult 
to read. How about using 
   
    new Throwable().printStackTrace();

##########
File path: helix-core/src/test/java/org/apache/helix/TestListenerCallback.java
##########
@@ -195,19 +205,27 @@ public void testScopedConfigChangeListener() throws 
Exception {
 
     listener.reset();
     _manager.addConfigChangeListener(listener, ConfigScopeProperty.CLUSTER);
-    Assert.assertTrue(listener._configChanged, "Should get initial 
clusterConfig callback invoked");
+    boolean result = TestHelper.verify(()-> {
+      return listener._configChanged;
+    }, TestHelper.WAIT_DURATION);
+    Assert.assertTrue(result,"Should get initial clusterConfig callback 
invoked");
     Assert.assertEquals(listener._configSize, 1, "Cluster Config size should 
be 1");
 
     listener.reset();
     _manager.addConfigChangeListener(listener, ConfigScopeProperty.RESOURCE);
+    result = TestHelper.verify(()-> {

Review comment:
       Assert result 

##########
File path: 
helix-core/src/test/java/org/apache/helix/integration/rebalancer/TestClusterInMaintenanceModeWhenReachingOfflineInstancesLimit.java
##########
@@ -165,17 +171,18 @@ public void testWithOfflineInstancesLimit() throws 
Exception {
       _participants.get(i).syncStop();
     }
 
-    Thread.sleep(500);
-
-    maintenanceSignal = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
-    Assert.assertNull(maintenanceSignal);
+    boolean result = TestHelper.verify(() -> {
+      MaintenanceSignal ms = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
+      return ms == null;
+    }, TestHelper.WAIT_DURATION);
+    Assert.assertTrue(result);
 
     _participants.get(i).syncStop();
 
-    Thread.sleep(500);
-    maintenanceSignal = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
-    Assert.assertNotNull(maintenanceSignal);
-    Assert.assertNotNull(maintenanceSignal.getReason());
+    result = TestHelper.verify(() -> {

Review comment:
       Assert

##########
File path: 
helix-core/src/test/java/org/apache/helix/integration/rebalancer/TestClusterInMaintenanceModeWhenReachingMaxPartition.java
##########
@@ -114,10 +115,10 @@ public void testDisableCluster() throws Exception {
       _participants.get(i).syncStop();
     }
 
-    Thread.sleep(1000L);
-    maintenanceSignal = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
-    Assert.assertNotNull(maintenanceSignal);
-    Assert.assertNotNull(maintenanceSignal.getReason());
+    boolean result = TestHelper.verify(() -> {

Review comment:
       Assert it

##########
File path: 
helix-core/src/test/java/org/apache/helix/integration/rebalancer/TestClusterInMaintenanceModeWhenReachingOfflineInstancesLimit.java
##########
@@ -130,18 +130,24 @@ public void testWithDisabledInstancesLimit() throws 
Exception {
       admin.enableInstance(CLUSTER_NAME, instance, false);
     }
 
-    Thread.sleep(500);
-
-    maintenanceSignal = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
-    Assert.assertNull(maintenanceSignal);
+    boolean result = TestHelper.verify(() -> {
+      MaintenanceSignal ms = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
+      return ms == null;
+    }, TestHelper.WAIT_DURATION);
+    Assert.assertTrue(result);
 
     String instance = _participants.get(i).getInstanceName();
     admin.enableInstance(CLUSTER_NAME, instance, false);
 
-    Thread.sleep(500);
-    maintenanceSignal = 
_dataAccessor.getProperty(_dataAccessor.keyBuilder().maintenance());
-    Assert.assertNotNull(maintenanceSignal);
-    Assert.assertNotNull(maintenanceSignal.getReason());
+    ZkHelixClusterVerifier clusterVerifier =
+        new 
BestPossibleExternalViewVerifier.Builder(CLUSTER_NAME).setZkClient(_gZkClient)
+            .build();
+    Assert.assertTrue(clusterVerifier.verifyByPolling());
+
+    result = TestHelper.verify(() -> {

Review comment:
       Assert it




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