Configuration allPartsConf = new Configuration(finalReduceConf);
allPartsConf.set(FileOutputFormat.OUTDIR, outputPath+"-all-parts");
byte[] allPartsPayload = MRHelpers.createUserPayloadFromConf(allPartsConf);
OutputDescriptor od2 = new OutputDescriptor(MROutput.class.getName())
.setUserPayload(allPartsPayload);
unionVertex.addOutput("parts", od1, MROutputCommitter.class);
checkerVertex.addOutput("all-parts", od2, MROutputCommitter.class);
dag.addVertex(mapVertex1)
.addVertex(mapVertex2)