org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators
Class POStore

java.lang.Object
  extended by org.apache.pig.impl.plan.Operator<PhyPlanVisitor>
      extended by org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
          extended by org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Operator>

public class POStore
extends PhysicalOperator

The store operator which is used in two ways: 1) As a local operator it can be used to store files 2) In the Map Reduce setting, it is used to create jobs from MapReduce operators which keep the loads and stores in the Map and Reduce Plans till the job is created

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
dummyBag, dummyBool, dummyDBA, dummyDouble, dummyFloat, dummyInt, dummyLong, dummyMap, dummyString, dummyTuple, input, inputAttached, inputs, lineageTracer, outputs, parentPlan, pigLogger, reporter, requestedParallelism, res, resultType
 
Fields inherited from class org.apache.pig.impl.plan.Operator
mKey
 
Constructor Summary
POStore(OperatorKey k)
           
POStore(OperatorKey k, int rp)
           
POStore(OperatorKey k, int rp, List<PhysicalOperator> inp)
           
 
Method Summary
 PigContext getPc()
           
 FileSpec getSFile()
           
 StoreFunc getStorer()
           
 String name()
           
 void setPc(PigContext pc)
           
 void setSFile(FileSpec file)
           
 Result store()
          The main method used by the local execution engine to store tuples into the specified file using the specified store function.
 boolean supportsMultipleInputs()
          Indicates whether this operator supports multiple inputs.
 boolean supportsMultipleOutputs()
          Indicates whether this operator supports multiple outputs.
 void visit(PhyPlanVisitor v)
          Visit this node with the provided visitor.
 
Methods inherited from class org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator
attachInput, clone, cloneHelper, detachInput, getInputs, getLogger, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getNext, getPigLogger, getRequestedParallelism, getResultType, isBlocking, isInputAttached, processInput, setInputs, setLineageTracer, setParentPlan, setPigLogger, setReporter, setRequestedParallelism, setResultType
 
Methods inherited from class org.apache.pig.impl.plan.Operator
compareTo, equals, getOperatorKey, hashCode, toString
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

POStore

public POStore(OperatorKey k)

POStore

public POStore(OperatorKey k,
               int rp)

POStore

public POStore(OperatorKey k,
               int rp,
               List<PhysicalOperator> inp)
Method Detail

store

public Result store()
             throws ExecException
The main method used by the local execution engine to store tuples into the specified file using the specified store function. One call to this method retrieves all tuples from its predecessor operator and stores it into the file till it recieves an EOP. If there is an error, the cleanUp routine is called and then the tearDown is called to close the OutputStream

Returns:
Whatever the predecessor returns A null from the predecessor is ignored and processing of further tuples continued
Throws:
ExecException

name

public String name()
Specified by:
name in class Operator<PhyPlanVisitor>

supportsMultipleInputs

public boolean supportsMultipleInputs()
Description copied from class: Operator
Indicates whether this operator supports multiple inputs.

Specified by:
supportsMultipleInputs in class Operator<PhyPlanVisitor>
Returns:
true if it does, otherwise false.

supportsMultipleOutputs

public boolean supportsMultipleOutputs()
Description copied from class: Operator
Indicates whether this operator supports multiple outputs.

Specified by:
supportsMultipleOutputs in class Operator<PhyPlanVisitor>
Returns:
true if it does, otherwise false.

getStorer

public StoreFunc getStorer()

visit

public void visit(PhyPlanVisitor v)
           throws VisitorException
Description copied from class: Operator
Visit this node with the provided visitor. This should only be called by the visitor class itself, never directly.

Specified by:
visit in class PhysicalOperator
Parameters:
v - Visitor to visit with.
Throws:
VisitorException - if the visitor has a problem.

getSFile

public FileSpec getSFile()

setSFile

public void setSFile(FileSpec file)

getPc

public PigContext getPc()

setPc

public void setPc(PigContext pc)


Copyright © ${year} The Apache Software Foundation