PersistentColocatedPartitionedRegionDUnitTest.testRebalanceWithOfflineChildRegion failed if do not wait on getResult

While attempting to work on GEODE-506, I commented out line s1538-1540 like the following

async1 = vm1.invokeAsync(createChildPR);
async0 = vm0.invokeAsync(createChildPR);
AsyncInvocation async2 = vm2.invokeAsync(createChildPR);
//async0.getResult(MAX_WAIT); – line 1538
//async1.getResult(MAX_WAIT); – line 1539
//async2.getResult(MAX_WAIT); – line 1540

This will reproduce the error similar to the one reported in GEODE506, but it failed on checking the data on parent region instead of the child region. Log files attached.

dunit.RMIException: While invoking com.gemstone.gemfire.internal.cache.partitioned.PersistentPartitionedRegionTestBase$5.run in VM 0 running on Host localhost with 4 VMs
at dunit.VM.invoke(VM.java:368)
at dunit.VM.invoke(VM.java:312)
at dunit.VM.invoke(VM.java:266)
at com.gemstone.gemfire.internal.cache.partitioned.PersistentPartitionedRegionTestBase.checkData(PersistentPartitionedRegionTestBase.java:182)
at com.gemstone.gemfire.internal.cache.partitioned.PersistentPartitionedRegionTestBase.checkData(PersistentPartitionedRegionTestBase.java:165)
at com.gemstone.gemfire.internal.cache.partitioned.PersistentColocatedPartitionedRegionDUnitTest.rebalanceWithOfflineChildRegion(PersistentColocatedPartitionedRegionDUnitTest.java:1543)
at com.gemstone.gemfire.internal.cache.partitioned.PersistentColocatedPartitionedRegionDUnitTest.testRebalanceWithOfflineChildRegion(PersistentColocatedPartitionedRegionDUnitTest.java:1223)
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:497)
at junit.framework.TestCase.runTest(TestCase.java:176)
at junit.framework.TestCase.runBare(TestCase.java:141)
at junit.framework.TestResult$1.protect(TestResult.java:122)
at junit.framework.TestResult.runProtected(TestResult.java:142)
at junit.framework.TestResult.run(TestResult.java:125)
at junit.framework.TestCase.run(TestCase.java:129)
at junit.framework.TestSuite.runTest(TestSuite.java:252)
at junit.framework.TestSuite.run(TestSuite.java:247)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:86)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: junit.framework.AssertionFailedError: For key 1 expected:<a> but was:<null>
at junit.framework.Assert.fail(Assert.java:57)
at junit.framework.Assert.failNotEquals(Assert.java:329)
at junit.framework.Assert.assertEquals(Assert.java:78)
at junit.framework.TestCase.assertEquals(TestCase.java:244)
at com.gemstone.gemfire.internal.cache.partitioned.PersistentPartitionedRegionTestBase$5.run(PersistentPartitionedRegionTestBase.java:177)
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:497)
at hydra.MethExecutor.executeObject(MethExecutor.java:267)
at dunit.standalone.RemoteDUnitVM.executeMethodOnObject(RemoteDUnitVM.java:77)
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:497)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$256(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)