org.apache.pig.backend.hadoop.executionengine.mapReduceLayer
Classes 
CombinerOptimizer
DistinctCombiner
DistinctCombiner.Combine
JobControlCompiler
JobControlCompiler.PigBagWritableComparator
JobControlCompiler.PigCharArrayWritableComparator
JobControlCompiler.PigDBAWritableComparator
JobControlCompiler.PigDoubleWritableComparator
JobControlCompiler.PigFloatWritableComparator
JobControlCompiler.PigIntWritableComparator
JobControlCompiler.PigLongWritableComparator
JobControlCompiler.PigTupleWritableComparator
JobControlCompiler.PigWritableComparator
KeyTypeDiscoveryVisitor
Launcher
LocalLauncher
MapReduceLauncher
MapReduceOper
MRCompiler
PigBytesRawComparator
PigCombiner
PigCombiner.Combine
PigDoubleRawComparator
PigFloatRawComparator
PigHadoopLogger
PigInputFormat
PigIntRawComparator
PigLongRawComparator
PigMapBase
PigMapOnly
PigMapOnly.Map
PigMapReduce
PigMapReduce.Map
PigMapReduce.MapWithComparator
PigMapReduce.Reduce
PigMapReduce.ReduceWithComparator
PigOutputFormat
PigOutputFormat.PigRecordWriter
PigSplit
PigTextRawComparator
PigTupleRawComparator
ProgressableReporter
SliceWrapper
UDFFinishVisitor
Exceptions 
JobCreationException
MRCompilerException