DistributedSharedCacheTwoNodesMapReduceTest.testInvokeMapReduceOnAllKeys random failures ---------------------------------------------------------------------------------------- Key: ISPN-5151 URL: https://issues.jboss.org/browse/ISPN-5151 Project: Infinispan Issue Type: Bug Components: Core, Test Suite - Core Affects Versions: 7.0.3.Final Reporter: Dan Berindei Assignee: Dan Berindei Priority: Blocker Labels: testsuite_stability Fix For: 8.2.0.Alpha1 The method {{invokeMapReduce()}} doesn't really invoke the M/R task, it only creates it, and the execution only starts when the test method calls {{task.execute()}} explicitly. It shouldn't try to check the contents of the shared intermediary cache, because the intermediary cache may not exist yet - and it may accidentally create it with the wrong configuration. I get this error when I run only the {{testInvokeMapReduceOnAllKeys}} method: {noformat} 09:55:37,632 TRACE (testng-DistributedSharedCacheTwoNodesMapReduceTest:) [DefaultCacheManager] About to wire and start cache __tmpMapReduce 09:55:37,646 DEBUG (testng-DistributedSharedCacheTwoNodesMapReduceTest:) [MapReduceTask] Invoking CreateCacheCommand{cacheManager=null, cacheNameToCreate='__tmpMapReduce', cacheConfigurationName='__tmpMapReduce', start=true', size=2} across members [DistributedSharedCacheTwoNodesMapReduceTest-NodeA-19271, DistributedSharedCacheTwoNodesMapReduceTest-NodeB-10341] 10:32:56,324 ERROR (testng-DistributedSharedCacheTwoNodesMapReduceTest:) [UnitTestTestNGListener] Test testInvokeMapReduceOnAllKeys(org.infinispan.distexec.mapreduce.DistributedSharedCacheTwoNodesMapReduceTest) failed. org.infinispan.distexec.mapreduce.MapReduceException: Map phase failed at org.infinispan.distexec.mapreduce.MapReduceTask.executeMapPhase(MapReduceTask.java:607) at org.infinispan.distexec.mapreduce.MapReduceTask.executeHelper(MapReduceTask.java:473) at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:414) at org.infinispan.distexec.mapreduce.BaseWordCountMapReduceTest.testInvokeMapReduceOnAllKeys(BaseWordCountMapReduceTest.java:162) Caused by: org.infinispan.commons.CacheException: java.lang.NullPointerException at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapAndCombineForDistributedReduction(MapReduceManagerImpl.java:105) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart.invokeMapCombineLocally(MapReduceTask.java:1174) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart.access$300(MapReduceTask.java:1101) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart$1.call(MapReduceTask.java:1123) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart$1.call(MapReduceTask.java:1119) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapKeysToNodes(MapReduceManagerImpl.java:363) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.migrateIntermediateKeysAndValues(MapReduceManagerImpl.java:327) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapAndCombine(MapReduceManagerImpl.java:260) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapAndCombineForDistributedReduction(MapReduceManagerImpl.java:103) ... 10 more {noformat} Even if the check is moved after the M/R task is finished, it still wouldn't be correct, because the task only cleans up the shared intermediary cache asynchronously. So it needs to use {{eventually()}} to avoid errors like this: {noformat} 04:06:32,260 ERROR (testng-DistributedSharedCacheTwoNodesMapReduceTest:) [UnitTestTestNGListener] Test testInvokeMapReduceOnAllKeys(org.infinispan.distexec.mapreduce.DistributedSharedCacheTwoNodesMapReduceTest) failed. java.lang.AssertionError: Shared cache __tmpMapReduce is not empty. It has 5 keys/values: [ImmortalCacheEntry{key=IntermediateCompositeKey [taskId=88948a8b-2a8a-4c13-bc45-4dc3a9f6b0fb, key=is], value=org.infinispan.distexec.mapreduce.MapReduceManagerImpl$DeltaAwareList@21ae10d3}, ImmortalCacheEntry{key=IntermediateCompositeKey [taskId=88948a8b-2a8a-4c13-bc45-4dc3a9f6b0fb, key=JUDCon], value=org.infinispan.distexec.mapreduce.MapReduceManagerImpl$DeltaAwareList@108d6b51}, ImmortalCacheEntry{key=IntermediateCompositeKey [taskId=88948a8b-2a8a-4c13-bc45-4dc3a9f6b0fb, key=cool], value=org.infinispan.distexec.mapreduce.MapReduceManagerImpl$DeltaAwareList@77949e8f}, ImmortalCacheEntry{key=IntermediateCompositeKey [taskId=88948a8b-2a8a-4c13-bc45-4dc3a9f6b0fb, key=Infinispan], value=org.infinispan.distexec.mapreduce.MapReduceManagerImpl$DeltaAwareList@712a6071}, ImmortalCacheEntry{key=IntermediateCompositeKey [taskId=88948a8b-2a8a-4c13-bc45-4dc3a9f6b0fb, key=community], value=org.infinispan.distexec.mapreduce.MapReduceManagerImpl$DeltaAwareList@291bdf76}] expected:<0> but was:<5> at org.junit.Assert.fail(Assert.java:88) at org.junit.Assert.failNotEquals(Assert.java:743) at org.junit.Assert.assertEquals(Assert.java:118) at org.junit.Assert.assertEquals(Assert.java:555) at org.infinispan.distexec.mapreduce.DistributedSharedCacheTwoNodesMapReduceTest.invokeMapReduce(DistributedSharedCacheTwoNodesMapReduceTest.java:44) at org.infinispan.distexec.mapreduce.BaseWordCountMapReduceTest.testInvokeMapReduceOnAllKeys(BaseWordCountMapReduceTest.java:161) 04:06:32,579 TRACE (transport-thread-NodeA-p29577-t6:) [InvocationContextInterceptor] Invoked with command RemoveCommand{key=IntermediateCompositeKey [taskId=eb7da48a-5922-4671-9037-4077e209744c, key=RedHat], value=null, flags=null, valueMatcher=MATCH_ALWAYS} and InvocationContext [org.infinispan.context.SingleKeyNonTxInvocationContext@c0bbc61] {noformat}