[MRUNIT-77] cannot use serializations that do not clone into object, or serializations without no arg constructors with reduce driver

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.1
• Fix Version/s: 0.9.0
• Assignee: Jim Donofrio
• Reporter: Jim Donofrio
• Created: 10/Mar/12 06:45
• Updated: 10/Mar/12 07:13
• Resolved: 10/Mar/12 07:00

Description

@Test
public void testJavaSerialization()

{ ReduceDriver<Integer, Integer, Integer, Integer> driver = ReduceDriver.newReduceDriver(new IdentityReducer<Integer, Integer>()); Configuration conf = new Configuration(); conf.set("io.serializations", "org.apache.hadoop.io.serializer.JavaSerialization"); driver.setConfiguration(conf); driver.withInputKey(1) .withInputValue(2) .withInputValue(3) .withInputValue(4) .withOutput(1, 2) .withOutput(1, 3) .withOutput(1, 4) .runTest(); }

The above test fails because the result of copy(next, value, conf) needs to be reassigned to value for serializations such as java serialization that dont change the copy argument. This also fails because of the lack of a no arg constructor which breaks the call to ReflectionUtils.newInstance(klass, conf)