sijie opened a new pull request #2595: [tests] Fix the synchronization problem at BrokerClientIntegrationTest.testMaxConcurrentTopicLoading URL: https://github.com/apache/incubator-pulsar/pull/2595 *Motivation* Following exception is observed in one of the CI jobs. ``` java.lang.NullPointerException at org.apache.pulsar.common.util.FutureUtil.waitForAll(FutureUtil.java:44) at org.apache.pulsar.client.impl.BrokerClientIntegrationTest.testMaxConcurrentTopicLoading(BrokerClientIntegrationTest.java:601) 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:124) at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:54) at org.testng.internal.InvokeMethodRunnable.run(InvokeMethodRunnable.java:44) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ``` The problem seems to be coming from improper synchronization in the tests. *Changes* Fix the synchronization problem in BrokerClientIntegrationTest.testMaxConcurrentTopicLoading
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