/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
/// <exception cref="System.TypeLoadException"/>
public override void Run(JobConf job, TaskUmbilicalProtocol umbilical)
{
job.SetBoolean(JobContext.SkipRecords, IsSkipping());
if (IsMapOrReduce())
{
copyPhase = GetProgress().AddPhase("copy");
sortPhase = GetProgress().AddPhase("sort");
reducePhase = GetProgress().AddPhase("reduce");
}
// start thread that will handle communication with parent
Task.TaskReporter reporter = StartReporter(umbilical);
bool useNewApi = job.GetUseNewReducer();
Initialize(job, GetJobID(), reporter, useNewApi);
// check if it is a cleanupJobTask
if (jobCleanup)
{
RunJobCleanupTask(umbilical, reporter);
return;
}
if (jobSetup)
{
RunJobSetupTask(umbilical, reporter);
return;
}
if (taskCleanup)
{
RunTaskCleanupTask(umbilical, reporter);
return;
}
// Initialize the codec
codec = InitCodec();
RawKeyValueIterator rIter = null;
ShuffleConsumerPlugin shuffleConsumerPlugin = null;
Type combinerClass = conf.GetCombinerClass();
Task.CombineOutputCollector combineCollector = (null != combinerClass) ? new Task.CombineOutputCollector
(reduceCombineOutputCounter, reporter, conf) : null;
Type clazz = job.GetClass <ShuffleConsumerPlugin>(MRConfig.ShuffleConsumerPlugin,
typeof(Shuffle));
shuffleConsumerPlugin = ReflectionUtils.NewInstance(clazz, job);
Log.Info("Using ShuffleConsumerPlugin: " + shuffleConsumerPlugin);
ShuffleConsumerPlugin.Context shuffleContext = new ShuffleConsumerPlugin.Context(
GetTaskID(), job, FileSystem.GetLocal(job), umbilical, base.lDirAlloc, reporter,
codec, combinerClass, combineCollector, spilledRecordsCounter, reduceCombineInputCounter
, shuffledMapsCounter, reduceShuffleBytes, failedShuffleCounter, mergedMapOutputsCounter
, taskStatus, copyPhase, sortPhase, this, mapOutputFile, localMapFiles);
shuffleConsumerPlugin.Init(shuffleContext);
rIter = shuffleConsumerPlugin.Run();
// free up the data structures
mapOutputFilesOnDisk.Clear();
sortPhase.Complete();
// sort is complete
SetPhase(TaskStatus.Phase.Reduce);
StatusUpdate(umbilical);
Type keyClass = job.GetMapOutputKeyClass();
Type valueClass = job.GetMapOutputValueClass();
RawComparator comparator = job.GetOutputValueGroupingComparator();
if (useNewApi)
{
RunNewReducer(job, umbilical, reporter, rIter, comparator, keyClass, valueClass);
}
else
{
RunOldReducer(job, umbilical, reporter, rIter, comparator, keyClass, valueClass);
}
shuffleConsumerPlugin.Close();
Done(umbilical, reporter);
}
public abstract void Init(ShuffleConsumerPlugin.Context <K, V> context);