jihoonson opened a new pull request #6807: Fix ParallelIndexTask when publishing empty segments URL: https://github.com/apache/incubator-druid/pull/6807 The overlord prints the below error if some task tries to publish empty segments. ``` java.lang.RuntimeException: java.lang.IllegalArgumentException: segment set must not be empty at org.apache.druid.indexing.common.actions.SegmentTransactionalInsertAction.perform(SegmentTransactionalInsertAction.java:126) at org.apache.druid.indexing.common.actions.SegmentTransactionalInsertAction.perform(SegmentTransactionalInsertAction.java:47) at org.apache.druid.indexing.common.actions.LocalTaskActionClient.submit(LocalTaskActionClient.java:74) at org.apache.druid.indexing.common.task.batch.parallel.SinglePhaseParallelIndexTaskRunner.lambda$publish$3(SinglePhaseParallelIndexTaskRunner.java:385) at org.apache.druid.indexing.common.task.batch.parallel.SinglePhaseParallelIndexTaskRunner.publish(SinglePhaseParallelIndexTaskRunner.java:396) at org.apache.druid.indexing.common.task.batch.parallel.SinglePhaseParallelIndexTaskRunner.run(SinglePhaseParallelIndexTaskRunner.java:160) at org.apache.druid.indexing.common.task.batch.parallel.ParallelIndexSupervisorTaskTest$TestSupervisorTask.run(ParallelIndexSupervisorTaskTest.java:306) at org.apache.druid.indexing.common.task.batch.parallel.ParallelIndexSupervisorTaskTest.testPublishEmptySegments(ParallelIndexSupervisorTaskTest.java:206) 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.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48) at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48) 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$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) Caused by: java.lang.IllegalArgumentException: segment set must not be empty at org.apache.druid.metadata.IndexerSQLMetadataStorageCoordinator.announceHistoricalSegments(IndexerSQLMetadataStorageCoordinator.java:288) at org.apache.druid.indexing.common.actions.SegmentTransactionalInsertAction.lambda$perform$0(SegmentTransactionalInsertAction.java:115) at org.apache.druid.indexing.overlord.CriticalAction.perform(CriticalAction.java:53) at org.apache.druid.indexing.overlord.TaskLockbox.doInCriticalSection(TaskLockbox.java:618) at org.apache.druid.indexing.common.actions.SegmentTransactionalInsertAction.perform(SegmentTransactionalInsertAction.java:110) ... 34 more ``` I think it's better to leave this as it is, but make the parallelIndexTask not to publish empty segments.
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