jihoonson edited a comment on issue #6336: update insert pending segments logic 
to synchronous
URL: https://github.com/apache/incubator-druid/pull/6336#issuecomment-430841806
 
 
   @FaxianZhao thanks for the fix! You don't have to rebase any commits in most 
cases. Once you commit, it's fine to leave them as they are. 
   
   The failing unit tests seem legit. Please check it.
   
   ```
   java.lang.RuntimeException: java.lang.NullPointerException: 
actionOnInvalidLocks
        at 
org.apache.druid.indexing.common.actions.SegmentAllocateAction.tryAllocate(SegmentAllocateAction.java:292)
        at 
org.apache.druid.indexing.common.actions.SegmentAllocateAction.tryAllocateSubsequentSegment(SegmentAllocateAction.java:248)
        at 
org.apache.druid.indexing.common.actions.SegmentAllocateAction.perform(SegmentAllocateAction.java:171)
        at 
org.apache.druid.indexing.common.actions.SegmentAllocateActionTest.allocate(SegmentAllocateActionTest.java:720)
        at 
org.apache.druid.indexing.common.actions.SegmentAllocateActionTest.testCannotAddToExistingSingleDimensionShardSpecs(SegmentAllocateActionTest.java:670)
        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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
        at 
org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
        at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:367)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:274)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:161)
        at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290)
        at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242)
        at 
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121)
   Caused by: java.lang.NullPointerException: actionOnInvalidLocks
        at 
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229)
        at 
org.apache.druid.indexing.overlord.CriticalAction.<init>(CriticalAction.java:48)
        at 
org.apache.druid.indexing.overlord.CriticalAction.<init>(CriticalAction.java:40)
        at 
org.apache.druid.indexing.overlord.CriticalAction$Builder.build(CriticalAction.java:80)
        at 
org.apache.druid.indexing.common.actions.SegmentAllocateAction.tryAllocate(SegmentAllocateAction.java:288)
        ... 32 more
   ```

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