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This article introduces how to solve the error reporting problem of running mrunit. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

When you read the authoritative guide of hadoop, when you run the example of mrunit (MaxTemperatureMapperTest), an exception is reported. After looking up the information on the Internet, there is a problem with the version of mrunit. You can find the corresponding version of mrunit by combining the version of hadoop.

In addition, I am looking for mrunit in the process, because the mrunit provided by http://mvnrepository.com/ can not be downloaded, I randomly found one and uploaded it to my nexus server to use, but in the process of running, there are still some problems, mainly mrunit also depends on the other two jar (mockito-all and powermock-api-mockito), add these two dependencies in pom.xml at the same time, pay attention to the version of the two jar.

Java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.TaskInputOutputContext But class was expected at org.apache.hadoop.mrunit.mapreduce.mock.MockContextWrapper.createCommon (MockContextWrapper.java:51) at org.apache.hadoop.mrunit.mapreduce.mock.MockMapContextWrapper.create (MockMapContextWrapper.java:65) at org.apache.hadoop.mrunit.mapreduce.mock.MockMapContextWrapper. (MockMapContextWrapper.java:57) at org.apache.hadoop.mrunit.mapreduce.MapDriver.run (MapDriver.java:195) at org.apache.hadoop.mrunit.MapDriverBase.runTest (MapDriverBase.java:185) at v1.MaxTemperatureMapperTest.processesValidRecord (MaxTemperatureMapperTest) . Java: 22) at sun.reflect.NativeMethodAccessorImpl.invoke0 (NativeMethod) at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:601) 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.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.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) org.apache.hadoop mrunit 1.1.0 Hadoop2 org.mockito mockito-all 1.10.19 org.powermock powermock-api-mockito 1.6.4 this is how to solve the error problem of running mrunit. I hope the above content can be of some help to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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