PigGenericMapReduce (Pig 0.14.0 API)

java.lang.Object
- org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce

```
public class PigGenericMapReduce
extends java.lang.Object
```
This class is the static Mapper & Reducer classes that are used by Pig to execute Pig Map Reduce jobs. Since there is a reduce phase, the leaf is bound to be a POLocalRearrange. So the map phase has to separate the key and tuple and collect it into the output collector. The shuffle and sort phase sorts these keys & tuples and creates key, List<Tuple> and passes the key and iterator to the list. The deserialized POPackage operator is used to package the key, List<Tuple> into pigKey, Bag<Tuple> where pigKey is of the appropriate pig type and then the result of the package is attached to the reduce plan which is executed if its not empty. Either the result of the reduce plan or the package res is collected into the output collector. The index of the tuple (that is, which bag it should be placed in by the package) is packed into the key. This is done so that hadoop sorts the keys in order of index for join. This class is the base class for PigMapReduce, which has slightly difference among different versions of hadoop. PigMapReduce implementation is located in $PIG_HOME/shims.

Nested Classes
Modifier and Type	Class and Description
`static class`	`PigGenericMapReduce.Map`
`static class`	`PigGenericMapReduce.MapWithComparator` This "specialized" map class is ONLY to be used in pig queries with order by a udf.
`static class`	`PigGenericMapReduce.MapWithPartitionIndex` Used by Skewed Join
`static class`	`PigGenericMapReduce.Reduce`
`static class`	`PigGenericMapReduce.ReduceWithComparator` This "specialized" reduce class is ONLY to be used in pig queries with order by a udf.

Fields
Modifier and Type	Field and Description
`static org.apache.hadoop.conf.Configuration`	`sJobConf` Deprecated. Use `UDFContext` instead in the following way to get the job's `Configuration`: UdfContext.getUdfContext().getJobConf()
`static java.lang.ThreadLocal<org.apache.hadoop.conf.Configuration>`	`sJobConfInternal`
`static org.apache.hadoop.mapreduce.JobContext`	`sJobContext`

Constructors
Constructor and Description
`PigGenericMapReduce()`

Methods
Modifier and Type	Method and Description
`static void`	`staticDataCleanup()`

public static org.apache.hadoop.mapreduce.JobContext sJobContext

@Deprecated
public static org.apache.hadoop.conf.Configuration sJobConf

Deprecated. Use UDFContext instead in the following way to get the job's Configuration:
UdfContext.getUdfContext().getJobConf()

public static java.lang.ThreadLocal<org.apache.hadoop.conf.Configuration> sJobConfInternal

public static void staticDataCleanup()

Class PigGenericMapReduce