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:

Serializable, Cloneable, Node

Direct Known Subclasses:

VectorMapOperator

public class MapOperator
extends Operator<MapWork>
implements Serializable, 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.
protected static class	MapOperator.MapOpCtx

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

Operator.OperatorFunc, Operator.State

Field Summary

Fields

Modifier and Type	Field and Description
protected long	cntr
protected MapOperator.MapOpCtx[]	currentCtxs
protected long	logEveryNRows
protected long	numRows

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

alias, childOperators, childOperatorsArray, childOperatorsTag, colExprMap, conf, CONTEXT_NAME_KEY, done, groupKeyObject, HIVECOUNTERCREATEDFILES, HIVECOUNTERFATAL, id, inputObjInspectors, isLogDebugEnabled, isLogInfoEnabled, isLogTraceEnabled, LOG, operatorId, out, outputObjInspector, parentOperators, PLOG, reporter, state, statsMap

Constructor Summary

Constructors

Constructor and Description
MapOperator()

Method Summary

Methods

Modifier and Type	Method and Description
void	cleanUpInputFileChangedOp()
void	closeOp(boolean abort) Operator specific close routine.
Deserializer	getCurrentDeserializer()
String	getName() Implements the getName function for the Node Interface.
static String	getOperatorName()
OperatorType	getType() Return the type of the specific operator among the types in OperatorType.
void	initializeContexts()
void	initializeMapOperator(org.apache.hadoop.conf.Configuration hconf)
Collection<Future<?>>	initializeOp(org.apache.hadoop.conf.Configuration hconf) Operator specific initialization.
static Object[]	populateVirtualColumnValues(ExecMapperContext ctx, List<VirtualColumn> vcs, Object[] vcValues, Deserializer deserializer)
void	process(Object row, int tag) Process the row.
void	process(org.apache.hadoop.io.Writable value)
protected void	rowsForwarded(int childrenDone, int rows)
void	setChildren(org.apache.hadoop.conf.Configuration hconf)

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

acceptLimitPushdown, allInitializedParentsAreClosed, areAllParentsInitialized, augmentPlan, cleanUpInputFileChanged, clone, cloneOp, cloneRecursiveChildren, close, columnNamesRowResolvedCanBeObtained, completeInitializationOp, createDummy, defaultEndGroup, defaultStartGroup, dump, dump, endGroup, flush, forward, getAdditionalCounters, getChildOperators, getChildren, getColumnExprMap, getConf, getConfiguration, getDone, getExecContext, getGroupKeyObject, getIdentifier, getInputObjInspectors, getNextCntr, getNumChild, getNumParent, getOperatorId, getOpTraits, getOutputObjInspector, getParentOperators, getSchema, getStatistics, getStats, initEvaluators, initEvaluators, initEvaluatorsAndReturnStruct, initialize, initialize, initializeChildren, initializeLocalWork, initOperatorId, isUseBucketizedHiveInputFormat, jobClose, jobCloseOp, logStats, opAllowedAfterMapJoin, opAllowedBeforeMapJoin, opAllowedBeforeSortMergeJoin, opAllowedConvertMapJoin, passExecContext, preorderMap, processGroup, removeChild, removeChildAndAdoptItsChildren, removeChildren, removeParent, replaceChild, replaceParent, reset, resetId, resetStats, setAlias, setChildOperators, setColumnExprMap, setConf, setDone, setExecContext, setGroupKeyObject, setId, setInputContext, setInputObjInspectors, setOperatorId, setOpTraits, setOutputCollector, setParentOperators, setReporter, setSchema, setStatistics, setUseBucketizedHiveInputFormat, startGroup, supportAutomaticSortMergeJoin, supportSkewJoinOptimization, supportUnionRemoveOptimization, toString, toString

Methods inherited from class java.lang.Object

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

Field Detail

numRows

protected transient long numRows

cntr

protected transient long cntr

logEveryNRows

protected transient long logEveryNRows

currentCtxs

protected transient MapOperator.MapOpCtx[] currentCtxs

Constructor Detail

MapOperator

public MapOperator()

Method Detail

setChildren

public void setChildren(org.apache.hadoop.conf.Configuration hconf)
                 throws Exception

Throws:

Exception

initializeOp

public Collection<Future<?>> initializeOp(org.apache.hadoop.conf.Configuration hconf)
                                   throws HiveException

Description copied from class: Operator

Operator specific initialization.

Overrides:

initializeOp in class Operator<MapWork>

Throws:

HiveException

initializeMapOperator

public void initializeMapOperator(org.apache.hadoop.conf.Configuration hconf)
                           throws HiveException

Throws:

HiveException

closeOp

public void closeOp(boolean abort)
             throws HiveException

Description copied from class: Operator

Operator specific close routine. Operators which inherents this class should overwrite this funtion for their specific cleanup routine.

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(org.apache.hadoop.io.Writable value)
             throws HiveException

Throws:

HiveException

rowsForwarded

protected final void rowsForwarded(int childrenDone,
                 int rows)

populateVirtualColumnValues

public static Object[] populateVirtualColumnValues(ExecMapperContext ctx,
                                   List<VirtualColumn> vcs,
                                   Object[] vcValues,
                                   Deserializer deserializer)

process

public void process(Object row,
           int tag)
             throws HiveException

Description copied from class: Operator

Process the row.

Specified by:

process 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 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 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.*

initializeContexts

public void initializeContexts()

getCurrentDeserializer

public Deserializer getCurrentDeserializer()