lhotari opened a new issue #9408:
URL: https://github.com/apache/pulsar/issues/9408


   org.apache.pulsar.broker.loadbalance.LoadBalancerTest is flaky. The 
testLeaderElection test method fails sporadically.
   
   ```
   java.util.NoSuchElementException: No value present
        at java.util.Optional.get(Optional.java:135)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.loopUntilLeaderChanges(LoadBalancerTest.java:185)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:743)
   ```
   
   [example failure 
2021-02-01T13:40:12.3522919Z](https://github.com/apache/pulsar/runs/1806657480?check_suite_focus=true#step:9:1994)
   [example failure 
2021-02-01T11:54:58.8604105Z](https://github.com/apache/pulsar/runs/1805502931?check_suite_focus=true#step:9:2044)
   [example failure 
2021-02-01T11:23:42.3794621Z](https://github.com/apache/pulsar/runs/1805264316?check_suite_focus=true#step:9:2344)
   [example failure 
2021-02-01T11:06:52.7534377Z](https://github.com/apache/pulsar/runs/1805085533?check_suite_focus=true#step:9:2178)
   [example failure 
2021-02-01T03:33:28.1828410Z](https://github.com/apache/pulsar/runs/1803586038?check_suite_focus=true#step:9:2899)
   [example failure 
2021-01-31T13:45:59.5870974Z](https://github.com/apache/pulsar/runs/1801121635?check_suite_focus=true#step:9:2093)
   [example failure 
2021-01-30T18:37:49.6338778Z](https://github.com/apache/pulsar/runs/1798267292?check_suite_focus=true#step:9:1937)
   [example failure 
2021-01-30T18:29:54.3189511Z](https://github.com/apache/pulsar/runs/1798267292?check_suite_focus=true#step:9:1437)
   [example failure 
2021-01-30T10:02:27.9882474Z](https://github.com/apache/pulsar/runs/1796827745?check_suite_focus=true#step:9:2870)
   [example failure 
2021-01-30T09:44:03.3715367Z](https://github.com/apache/pulsar/runs/1796827745?check_suite_focus=true#step:9:1294)
   [example failure 
2021-01-30T09:11:24.3449948Z](https://github.com/apache/pulsar/runs/1796714099?check_suite_focus=true#step:9:3113)
   [example failure 
2021-01-30T08:53:01.0720954Z](https://github.com/apache/pulsar/runs/1796714099?check_suite_focus=true#step:9:1224)
   [example failure 
2021-01-29T00:11:58.6667897Z](https://github.com/apache/pulsar/runs/1788100574?check_suite_focus=true#step:9:1127)
   [example failure 
2021-01-28T15:32:42.7100802Z](https://github.com/apache/pulsar/runs/1784405661?check_suite_focus=true#step:8:1921)
   [example failure 
2021-01-28T15:23:10.6157274Z](https://github.com/apache/pulsar/runs/1784405661?check_suite_focus=true#step:8:1421)
   [example failure 
2021-01-28T15:12:14.1950625Z](https://github.com/apache/pulsar/runs/1784405661?check_suite_focus=true#step:8:903)
   [example failure 
2021-01-28T07:23:32.7249440Z](https://github.com/apache/pulsar/runs/1782001667?check_suite_focus=true#step:8:1922)
   [example failure 
2021-01-28T07:15:33.8671272Z](https://github.com/apache/pulsar/runs/1782001667?check_suite_focus=true#step:8:1323)
   [example failure 
2021-01-28T07:07:30.7523687Z](https://github.com/apache/pulsar/runs/1782001667?check_suite_focus=true#step:8:827)
   [example failure 
2021-01-28T01:59:46.6547905Z](https://github.com/apache/pulsar/runs/1781059882?check_suite_focus=true#step:8:1538)
   [example failure 
2021-01-28T01:52:11.4000197Z](https://github.com/apache/pulsar/runs/1781059882?check_suite_focus=true#step:8:974)
   [example failure 
2021-01-27T21:58:30.2044042Z](https://github.com/apache/pulsar/runs/1778467744?check_suite_focus=true#step:8:1417)
   [example failure 
2021-01-27T12:06:15.0002925Z](https://github.com/apache/pulsar/runs/1775096684?check_suite_focus=true#step:8:1935)
   [example failure 
2021-01-27T11:58:41.8274891Z](https://github.com/apache/pulsar/runs/1775096684?check_suite_focus=true#step:8:1369)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.util.NoSuchElementException: No value present
        at java.util.Optional.get(Optional.java:135)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.loopUntilLeaderChanges(LoadBalancerTest.java:185)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:743)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:46725)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T10:49:19.1817633Z](https://github.com/apache/pulsar/runs/1805085533?check_suite_focus=true#step:9:1129)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:46725)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:35563)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T13:27:59.9104169Z](https://github.com/apache/pulsar/runs/1806383882?check_suite_focus=true#step:9:1539)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:35563)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:38237)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-31T13:27:37.9313406Z](https://github.com/apache/pulsar/runs/1801121635?check_suite_focus=true#step:9:1095)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:38237)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:36589)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-31T13:37:02.0885058Z](https://github.com/apache/pulsar/runs/1801121635?check_suite_focus=true#step:9:1594)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:36589)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:36253)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T23:15:52.1427955Z](https://github.com/apache/pulsar/runs/1779704427?check_suite_focus=true#step:8:869)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:36253)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:46437)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T13:20:28.5577038Z](https://github.com/apache/pulsar/runs/1775226632?check_suite_focus=true#step:8:2222)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:46437)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:34401)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-26T21:22:27.4025488Z](https://github.com/apache/pulsar/runs/1770217004?check_suite_focus=true#step:8:1598)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:34401)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:45573)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T11:45:44.5009257Z](https://github.com/apache/pulsar/runs/1805502931?check_suite_focus=true#step:9:1539)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:45573)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:43183)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T04:07:41.3221135Z](https://github.com/apache/pulsar/runs/1803720627?check_suite_focus=true#step:9:2224)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:43183)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:32955)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-26T21:38:08.1357619Z](https://github.com/apache/pulsar/runs/1770217004?check_suite_focus=true#step:8:2596)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:32955)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:37271)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T01:25:39.9608804Z](https://github.com/apache/pulsar/runs/1773579903?check_suite_focus=true#step:8:679)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:37271)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:38263)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-28T02:07:26.8743907Z](https://github.com/apache/pulsar/runs/1781059882?check_suite_focus=true#step:8:2034)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:38263)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:39203)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-26T21:30:13.3435396Z](https://github.com/apache/pulsar/runs/1770217004?check_suite_focus=true#step:8:2097)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:39203)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost2:36493)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T11:36:57.1174828Z](https://github.com/apache/pulsar/runs/1805502931?check_suite_focus=true#step:9:970)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost2:36493)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:46259)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T06:49:07.9611925Z](https://github.com/apache/pulsar/runs/1774699381?check_suite_focus=true#step:8:1948)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:46259)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:37953)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-30T09:02:07.6453109Z](https://github.com/apache/pulsar/runs/1796714099?check_suite_focus=true#step:9:2167)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:37953)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:39865)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T01:41:04.8537837Z](https://github.com/apache/pulsar/runs/1773579903?check_suite_focus=true#step:8:1814)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost3:39865)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost2:34025)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T03:57:37.0419371Z](https://github.com/apache/pulsar/runs/1803720627?check_suite_focus=true#step:9:1657)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost2:34025)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:38887)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T20:47:03.8399173Z](https://github.com/apache/pulsar/runs/1778222671?check_suite_focus=true#step:8:1833)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:38887)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:46513)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-02-01T13:18:35.4373409Z](https://github.com/apache/pulsar/runs/1806383882?check_suite_focus=true#step:9:970)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:46513)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:40269)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-29T00:19:52.4940690Z](https://github.com/apache/pulsar/runs/1788100574?check_suite_focus=true#step:9:1691)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:40269)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:41803)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T23:30:22.3669629Z](https://github.com/apache/pulsar/runs/1779704427?check_suite_focus=true#step:8:1945)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:41803)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:42221)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T06:40:00.5182280Z](https://github.com/apache/pulsar/runs/1774699381?check_suite_focus=true#step:8:1367)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:42221)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.util.NoSuchElementException: No value present
        at java.util.Optional.get(Optional.java:135)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.loopUntilLeaderChanges(LoadBalancerTest.java:186)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:744)
   ```
   
   [example failure 
2021-01-28T18:29:27.4273404Z](https://github.com/apache/pulsar/runs/1784535146?check_suite_focus=true#step:8:1414)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.util.NoSuchElementException: No value present
        at java.util.Optional.get(Optional.java:135)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.loopUntilLeaderChanges(LoadBalancerTest.java:186)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:744)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:41757)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T06:29:47.3585099Z](https://github.com/apache/pulsar/runs/1774699381?check_suite_focus=true#step:8:842)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost1:41757)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:37805)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T08:05:03.5029714Z](https://github.com/apache/pulsar/runs/1774877571?check_suite_focus=true#step:8:683)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:37805)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   ```
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:37205)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
   ```
   
   [example failure 
2021-01-27T21:50:29.0310289Z](https://github.com/apache/pulsar/runs/1778467744?check_suite_focus=true#step:8:846)
   
   
   <details>
   <summary>Full exception stacktrace</summary>
   <code><pre>
   java.lang.AssertionError: expected 
[Optional[LeaderBroker(serviceUrl=http://localhost4:37205)]] but found 
[Optional.empty]
        at org.testng.Assert.fail(Assert.java:99)
        at org.testng.Assert.failNotEquals(Assert.java:1037)
        at org.testng.Assert.assertEqualsImpl(Assert.java:140)
        at org.testng.Assert.assertEquals(Assert.java:122)
        at org.testng.Assert.assertEquals(Assert.java:617)
        at 
org.apache.pulsar.broker.loadbalance.LoadBalancerTest.testLeaderElection(LoadBalancerTest.java:737)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   
   </pre></code>
   </details>
   
   


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