/**
* @param op
* @param index
* @param plan
* @throws PlanException
*/
private static void setProjectInput(PhysicalOperator op, PhysicalPlan plan, int index)
throws PlanException {
String scope = op.getOperatorKey().scope;
POProject proj =
new POProject(
new OperatorKey(scope, NodeIdGenerator.getGenerator().getNextNodeId(scope)),
op.getRequestedParallelism(),
index);
proj.setResultType(DataType.BAG);
// Remove old connections and elements from the plan
plan.trimAbove(op);
plan.add(proj);
plan.connect(proj, op);
List<PhysicalOperator> inputs = Lists.newArrayList();
inputs.add(proj);
op.setInputs(inputs);
}
/**
* stolen from JobControlCompiler TODO: refactor it to share this
*
* @param physicalPlan
* @param poLoad
* @param jobConf
* @return
* @throws java.io.IOException
*/
private static JobConf configureLoader(PhysicalPlan physicalPlan, POLoad poLoad, JobConf jobConf)
throws IOException {
// 这部分似乎没用
Job job = new Job(jobConf);
LoadFunc loadFunc = poLoad.getLoadFunc();
loadFunc.setLocation(poLoad.getLFile().getFileName(), job);
// stolen from JobControlCompiler
ArrayList<FileSpec> pigInputs = new ArrayList<FileSpec>();
// Store the inp filespecs
pigInputs.add(poLoad.getLFile());
ArrayList<List<OperatorKey>> inpTargets = Lists.newArrayList();
ArrayList<String> inpSignatures = Lists.newArrayList();
ArrayList<Long> inpLimits = Lists.newArrayList();
// Store the target operators for tuples read
// from this input
List<PhysicalOperator> loadSuccessors = physicalPlan.getSuccessors(poLoad);
List<OperatorKey> loadSuccessorsKeys = Lists.newArrayList();
if (loadSuccessors != null) {
for (PhysicalOperator loadSuccessor : loadSuccessors) {
loadSuccessorsKeys.add(loadSuccessor.getOperatorKey());
}
}
inpTargets.add(loadSuccessorsKeys);
inpSignatures.add(poLoad.getSignature());
inpLimits.add(poLoad.getLimit());
jobConf.set("pig.inputs", ObjectSerializer.serialize(pigInputs));
jobConf.set("pig.inpTargets", ObjectSerializer.serialize(inpTargets));
jobConf.set("pig.inpSignatures", ObjectSerializer.serialize(inpSignatures));
jobConf.set("pig.inpLimits", ObjectSerializer.serialize(inpLimits));
return jobConf;
}