org.apache.spark.rdd

Class BlockRDD<T>

Object

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

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

All Implemented Interfaces:

java.io.Serializable, Logging

Direct Known Subclasses:

WriteAheadLogBackedBlockRDD

public class BlockRDD<T>
extends RDD<T>

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BlockRDD(SparkContext sc, BlockId[] blockIds, scala.reflect.ClassTag<T> evidence$1)

Method Summary

Methods

Modifier and Type	Method and Description
void	assertValid() Check if this BlockRDD is valid.
BlockId[]	blockIds()
scala.collection.Iterator<T>	compute(Partition split, TaskContext context) :: DeveloperApi :: Implemented by subclasses to compute a given partition.
Partition[]	getPartitions() Implemented by subclasses to return the set of partitions in this RDD.
scala.collection.Seq<String>	getPreferredLocations(Partition split) Optionally overridden by subclasses to specify placement preferences.
boolean	isValid() Whether this BlockRDD is actually usable.
scala.collection.immutable.Map<BlockId,scala.collection.Seq<String>>	locations_()
void	removeBlocks() Remove the data blocks that this BlockRDD is made from.

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

aggregate, cache, cartesian, checkpoint, checkpointData, coalesce, collect, collect, collectPartitions, computeOrReadCheckpoint, conf, context, count, countApprox, countApproxDistinct, countApproxDistinct, countByValue, countByValueApprox, creationSite, dependencies, distinct, distinct, doCheckpoint, elementClassTag, filter, filterWith, first, flatMap, flatMapWith, fold, foreach, foreachPartition, foreachWith, getCheckpointFile, getCreationSite, getNarrowAncestors, getStorageLevel, glom, groupBy, groupBy, groupBy, id, intersection, intersection, intersection, isCheckpointed, iterator, keyBy, map, mapPartitions, mapPartitionsWithContext, mapPartitionsWithIndex, mapPartitionsWithSplit, mapWith, markCheckpointed, max, min, name, partitioner, partitions, persist, persist, pipe, pipe, pipe, preferredLocations, randomSplit, reduce, repartition, retag, retag, sample, saveAsObjectFile, saveAsTextFile, saveAsTextFile, setName, sortBy, sparkContext, subtract, subtract, subtract, take, takeOrdered, takeSample, toArray, toDebugString, toJavaRDD, toLocalIterator, top, toString, union, unpersist, zip, zipPartitions, zipPartitions, zipPartitions, zipPartitions, zipPartitions, zipPartitions, zipWithIndex, zipWithUniqueId

Methods inherited from class Object

equals, 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

BlockRDD

public BlockRDD(SparkContext sc,
        BlockId[] blockIds,
        scala.reflect.ClassTag<T> evidence$1)

Method Detail

blockIds

public BlockId[] blockIds()

locations_

public scala.collection.immutable.Map<BlockId,scala.collection.Seq<String>> locations_()

getPartitions

public 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.

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>

getPreferredLocations

public scala.collection.Seq<String> getPreferredLocations(Partition split)

Description copied from class: RDD

Optionally overridden by subclasses to specify placement preferences.

removeBlocks

public void removeBlocks()

Remove the data blocks that this BlockRDD is made from. NOTE: This is an irreversible operation, as the data in the blocks cannot be recovered back once removed. Use it with caution.

isValid

public boolean isValid()

Whether this BlockRDD is actually usable. This will be false if the data blocks have been removed using this.removeBlocks.

assertValid

public void assertValid()

Check if this BlockRDD is valid. If not valid, exception is thrown.