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

Removed Classes
PigMapBase  
PigMapReduce This class is the static Mapper & Reducer classes that are used by Pig to execute Pig Map Reduce jobs.
PigMapReduce.Map  
PigMapReduce.MapWithComparator This "specialized" map class is ONLY to be used in pig queries with order by a udf.
PigMapReduce.MapWithPartitionIndex Used by Skewed Join
PigMapReduce.Reduce  
PigMapReduce.ReduceWithComparator This "specialized" reduce class is ONLY to be used in pig queries with order by a udf.
 

Added Classes
LimitAdjuster  
MRUtil  
PigGenericMapBase This class is the base class for PigMapBase which has slightly difference among different versions of hadoop.
PigGenericMapReduce This class is the static Mapper & Reducer classes that are used by Pig to execute Pig Map Reduce jobs.
PigGenericMapReduce.Map  
PigGenericMapReduce.MapWithComparator This "specialized" map class is ONLY to be used in pig queries with order by a udf.
PigGenericMapReduce.MapWithPartitionIndex Used by Skewed Join
PigGenericMapReduce.Reduce  
PigGenericMapReduce.ReduceWithComparator This "specialized" reduce class is ONLY to be used in pig queries with order by a udf.
 

Changed Classes
ColumnChainInfo  
ColumnInfo  
JobControlCompiler This is compiler class that takes an MROperPlan and converts it into a JobControl object with the relevant dependency info maintained.
MapReduceLauncher Main class that launches pig for Map Reduce
MapReduceOper An operator model for a Map Reduce job.
PhyPlanSetter Sets the parent plan for all Physical Operators.
PigMapOnly.Map  
PigOutputCommitter A specialization of the default FileOutputCommitter to allow pig to inturn delegate calls to the OutputCommiter(s) of the StoreFunc(s)' OutputFormat(s).
PigSplit The main split class that maintains important information about the input split.