org.apache.hadoop.hive.ql.exec

Class MapOperator

java.lang.Object

org.apache.hadoop.hive.ql.exec.Operator<MapWork>

org.apache.hadoop.hive.ql.exec.MapOperator

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Node

public class MapOperator
extends Operator<MapWork>
implements java.io.Serializable, java.lang.Cloneable

Map operator. This triggers overall map side processing. This is a little different from regular operators in that it starts off by processing a Writable data structure from a Table (instead of a Hive Object).

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MapOperator.Counter Counter.

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.Operator

Operator.OperatorFunc, Operator.ProgressCounter, Operator.State

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.exec.Operator

alias, beginTime, childOperators, childOperatorsArray, childOperatorsTag, colExprMap, conf, counterNames, counterNameToEnum, counters, done, fatalErrorCntr, groupKeyObject, id, inputObjInspectors, inputRows, isLogInfoEnabled, LOG, numInputRowsCntr, numOutputRowsCntr, operatorId, out, outputObjInspector, outputRows, parentOperators, reporter, state, statsMap, timeTakenCntr, totalTime

Constructor Summary

Constructors

Constructor and Description
MapOperator()

Method Summary

Modifier and Type	Method and Description
void	cleanUpInputFileChangedOp()
void	closeOp(boolean abort) close extra child operators that are initialized but are not executed.
java.lang.String	getName() Implements the getName function for the Node Interface.
static java.lang.String	getOperatorName()
OperatorType	getType() Return the type of the specific operator among the types in OperatorType.
void	initializeAsRoot(Configuration hconf, MapWork mapWork) Initializes this map op as the root of the tree.
void	initializeOp(Configuration hconf) Operator specific initialization.
static Writable[]	populateVirtualColumnValues(ExecMapperContext ctx, java.util.List<VirtualColumn> vcs, Writable[] vcValues, Deserializer deserializer)
void	process(Writable value)
void	processOp(java.lang.Object row, int tag) Process the row.
void	setChildren(Configuration hconf)

Methods inherited from class org.apache.hadoop.hive.ql.exec.Operator

acceptLimitPushdown, allInitializedParentsAreClosed, areAllParentsInitialized, assignCounterNameToEnum, augmentPlan, checkFatalErrors, cleanUpInputFileChanged, clone, close, columnNamesRowResolvedCanBeObtained, dump, dump, endGroup, fatalErrorMessage, flush, forward, getAdditionalCounters, getChildOperators, getChildren, getColumnExprMap, getConf, getConfiguration, getCounterNames, getCounterNameToEnum, getCounters, getDone, getExecContext, getGroupKeyObject, getIdentifier, getInputObjInspectors, getNextCntr, getNumChild, getNumParent, getOperatorId, getParentOperators, getSchema, getStats, getWrappedCounterName, incrCounter, initEvaluators, initEvaluators, initEvaluatorsAndReturnStruct, initialize, initialize, initializeChildren, initializeCounters, initializeLocalWork, initOperatorId, isUseBucketizedHiveInputFormat, jobClose, jobCloseOp, logStats, opAllowedAfterMapJoin, opAllowedBeforeMapJoin, opAllowedBeforeSortMergeJoin, opAllowedConvertMapJoin, passExecContext, preorderMap, process, processGroup, removeChild, removeChildAndAdoptItsChildren, removeChildren, removeParent, replaceChild, replaceParent, reset, resetId, resetLastEnumUsed, resetStats, setAlias, setChildOperators, setColumnExprMap, setConf, setCounterNames, setCounterNameToEnum, setDone, setExecContext, setGroupKeyObject, setId, setInputObjInspectors, setOperatorId, setOutputCollector, setParentOperators, setReporter, setSchema, setUseBucketizedHiveInputFormat, startGroup, supportAutomaticSortMergeJoin, supportSkewJoinOptimization, supportUnionRemoveOptimization, toString, toString, updateCounters

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MapOperator

public MapOperator()

Method Detail

initializeAsRoot

public void initializeAsRoot(Configuration hconf,
                             MapWork mapWork)
                      throws HiveException

Initializes this map op as the root of the tree. It sets JobConf & MapRedWork and starts initialization of the operator tree rooted at this op.

Parameters:

hconf -

mrwork -

Throws:

HiveException

setChildren

public void setChildren(Configuration hconf)
                 throws HiveException

Throws:

HiveException

initializeOp

public void initializeOp(Configuration hconf)
                  throws HiveException

Description copied from class: Operator

Operator specific initialization.

Overrides:

initializeOp in class Operator<MapWork>

Throws:

HiveException

closeOp

public void closeOp(boolean abort)
             throws HiveException

close extra child operators that are initialized but are not executed.

Overrides:

closeOp in class Operator<MapWork>

Throws:

HiveException

cleanUpInputFileChangedOp

public void cleanUpInputFileChangedOp()
                               throws HiveException

Overrides:

cleanUpInputFileChangedOp in class Operator<MapWork>

Throws:

HiveException

process

public void process(Writable value)
             throws HiveException

Throws:

HiveException

populateVirtualColumnValues

public static Writable[] populateVirtualColumnValues(ExecMapperContext ctx,
                                                     java.util.List<VirtualColumn> vcs,
                                                     Writable[] vcValues,
                                                     Deserializer deserializer)

processOp

public void processOp(java.lang.Object row,
                      int tag)
               throws HiveException

Description copied from class: Operator

Process the row.

Specified by:

processOp in class Operator<MapWork>

Parameters:

row - The object representing the row.

tag - The tag of the row usually means which parent this row comes from. Rows with the same tag should have exactly the same rowInspector all the time.

Throws:

HiveException

getName

public java.lang.String getName()

Description copied from class: Operator

Implements the getName function for the Node Interface.

Specified by:

getName in interface Node

Overrides:

getName in class Operator<MapWork>

Returns:

the name of the operator

getOperatorName

public static java.lang.String getOperatorName()

getType

public OperatorType getType()

Description copied from class: Operator

Return the type of the specific operator among the types in OperatorType.

Specified by:

getType in class Operator<MapWork>

Returns:

OperatorType.*