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Package org.apache.pig.backend.hadoop.executionengine.mapReduceLayer

Added Classes
AccumulatorOptimizer A visitor to optimize plans that determines if a reduce plan can run in accumulative mode.
ColumnChainInfo  
ColumnInfo  
JobControlCompiler.PigSecondaryKeyGroupComparator  
PigMapReduce.MapWithPartitionIndex Used by Skewed Join
PigOutputCommitter A specialization of the default FileOutputCommitter to allow pig to call commit() on the StoreFunc's associated with the stores in a job IF the StoreFunc's are CommittableStoreFunc's
PigSecondaryKeyComparator  
SampleOptimizer A visitor to optimize plans that have a sample job that immediately follows a load/store only MR job.
SecondaryKeyOptimizer  
SortKeyInfo  
 

Changed Classes
JobControlCompiler This is compiler class that takes an MROperPlan and converts it into a JobControl object with the relevant dependency info maintained.
Launcher  
MRCompiler The compiler that compiles a given physical plan into a DAG of MapReduce operators which can then be converted into the JobControl structure.
MapReduceOper An operator model for a Map Reduce job.
MapReducePOStoreImpl This class is used to have a POStore write to DFS via a output collector/record writer.
PhyPlanSetter Sets the parent plan for all Physical Operators.
PigMapBase