org.apache.spark.rdd

Class PartitionPruningRDD<T>

java.lang.Object

org.apache.spark.rdd.RDD<T>

org.apache.spark.rdd.PartitionPruningRDD<T>

All Implemented Interfaces:

java.io.Serializable, Logging

public class PartitionPruningRDD<T>
extends RDD<T>

:: DeveloperApi :: A RDD used to prune RDD partitions/partitions so we can avoid launching tasks on all partitions. An example use case: If we know the RDD is partitioned by range, and the execution DAG has a filter on the key, we can avoid launching tasks on partitions that don't have the range covering the key.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PartitionPruningRDD(RDD<T> prev, scala.Function1<java.lang.Object,java.lang.Object> partitionFilterFunc, scala.reflect.ClassTag<T> evidence$1)

Method Summary

Methods

Modifier and Type	Method and Description
scala.collection.Iterator<T>	compute(Partition split, TaskContext context) :: DeveloperApi :: Implemented by subclasses to compute a given partition.
static <T> PartitionPruningRDD<T>	create(RDD<T> rdd, scala.Function1<java.lang.Object,java.lang.Object> partitionFilterFunc) Create a PartitionPruningRDD.
protected Partition[]	getPartitions() Implemented by subclasses to return the set of partitions in this RDD.

Methods inherited from class org.apache.spark.rdd.RDD

aggregate, cache, cartesian, checkpoint, checkpointData, clearDependencies, coalesce, collect, collect, context, count, countApprox, countApproxDistinct, countApproxDistinct, countByValue, countByValueApprox, creationSite, dependencies, distinct, distinct, doubleRDDToDoubleRDDFunctions, filter, filterWith, first, firstParent, flatMap, flatMapWith, fold, foreach, foreachPartition, foreachWith, getCheckpointFile, getDependencies, getPreferredLocations, getStorageLevel, glom, groupBy, groupBy, groupBy, id, intersection, intersection, intersection, isCheckpointed, isEmpty, iterator, keyBy, localCheckpoint, map, mapPartitions, mapPartitionsWithContext, mapPartitionsWithIndex, mapPartitionsWithSplit, mapWith, max, min, name, numericRDDToDoubleRDDFunctions, parent, partitioner, partitions, persist, persist, pipe, pipe, pipe, preferredLocations, randomSplit, rddToAsyncRDDActions, rddToOrderedRDDFunctions, rddToPairRDDFunctions, rddToSequenceFileRDDFunctions, reduce, repartition, sample, saveAsObjectFile, saveAsTextFile, saveAsTextFile, scope, setName, sortBy, sparkContext, subtract, subtract, subtract, take, takeOrdered, takeSample, toArray, toDebugString, toJavaRDD, toLocalIterator, top, toString, treeAggregate, treeReduce, union, unpersist, zip, zipPartitions, zipPartitions, zipPartitions, zipPartitions, zipPartitions, zipPartitions, zipWithIndex, zipWithUniqueId

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.spark.Logging

initializeIfNecessary, initializeLogging, isTraceEnabled, log_, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning

Constructor Detail

PartitionPruningRDD

public PartitionPruningRDD(RDD<T> prev,
                   scala.Function1<java.lang.Object,java.lang.Object> partitionFilterFunc,
                   scala.reflect.ClassTag<T> evidence$1)

Method Detail

create

public static <T> PartitionPruningRDD<T> create(RDD<T> rdd,
                                scala.Function1<java.lang.Object,java.lang.Object> partitionFilterFunc)

Create a PartitionPruningRDD. This function can be used to create the PartitionPruningRDD when its type T is not known at compile time.

Parameters:

rdd - (undocumented)

partitionFilterFunc - (undocumented)

Returns:

(undocumented)

compute

public scala.collection.Iterator<T> compute(Partition split,
                                   TaskContext context)

Description copied from class: RDD

:: DeveloperApi :: Implemented by subclasses to compute a given partition.

Specified by:

compute in class RDD<T>

Parameters:

split - (undocumented)

context - (undocumented)

Returns:

(undocumented)

getPartitions

protected Partition[] getPartitions()

Description copied from class: RDD

Implemented by subclasses to return the set of partitions in this RDD. This method will only be called once, so it is safe to implement a time-consuming computation in it.

Specified by:

getPartitions in class RDD<T>

Returns:

(undocumented)