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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MRUNIT-184) Context.write does not accept null key
Date Mon, 08 Apr 2013 21:36:15 GMT
Brock Noland created MRUNIT-184:
-----------------------------------

             Summary: Context.write does not accept null key
                 Key: MRUNIT-184
                 URL: https://issues.apache.org/jira/browse/MRUNIT-184
             Project: MRUnit
          Issue Type: Improvement
            Reporter: Brock Noland


>From the cdh-user list.

"just in case it provides some clue to the next person who stumbles across this problem -
if you use 'null' for your key in context.write - you'll get a stack trace like this when
using mrunit-0.9.0-incubating:hadoop2:"

{noformat}
java.lang.NullPointerException
    at org.apache.hadoop.mrunit.Serialization.copy(Serialization.java:52)
    at org.apache.hadoop.mrunit.Serialization.copy(Serialization.java:81)
    at org.apache.hadoop.mrunit.mapreduce.mock.MockContextWrapper$4.answer(MockContextWrapper.java:78)
    at org.mockito.internal.stubbing.StubbedInvocationMatcher.answer(StubbedInvocationMatcher.java:31)
    at org.mockito.internal.MockHandler.handle(MockHandler.java:97)
    at org.mockito.internal.creation.MethodInterceptorFilter.intercept(MethodInterceptorFilter.java:47)
    at org.apache.hadoop.mapreduce.Reducer$Context$$EnhancerByMockitoWithCGLIB$$368a159e.write(<generated>)
    at x.y.z.MyReducer.reduce(MyReducer.java:141)
    at x.y.z.MyReducer.reduce(MyReducer.java:1)
    at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:164)
    at org.apache.hadoop.mrunit.mapreduce.ReduceDriver.run(ReduceDriver.java:230)
    at org.apache.hadoop.mrunit.mapreduce.MapReduceDriver$ReducePhaseRunner.runReduce(MapReduceDriver.java:284)
    at org.apache.hadoop.mrunit.mapreduce.MapReduceDriver$ReducePhaseRunner.access$300(MapReduceDriver.java:269)
    at org.apache.hadoop.mrunit.mapreduce.MapReduceDriver.run(MapReduceDriver.java:325)
    at org.apache.hadoop.mrunit.MapReduceDriverBase.runTest(MapReduceDriverBase.java:141)
    at org.apache.hadoop.mrunit.TestDriver.runTest(TestDriver.java:137)
    at x.y.z.MyMapReduceTest.testAggregateKeys(MyMapReduceTest.java:250)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
{noformat}

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