Packages

package root

Definition Classes: root

package org

Definition Classes: root

package apache

Definition Classes: org

package spark

Core Spark functionality.

Core Spark functionality. org.apache.spark.SparkContext serves as the main entry point to Spark, while org.apache.spark.rdd.RDD is the data type representing a distributed collection, and provides most parallel operations.

In addition, org.apache.spark.rdd.PairRDDFunctions contains operations available only on RDDs of key-value pairs, such as groupByKey and join; org.apache.spark.rdd.DoubleRDDFunctions contains operations available only on RDDs of Doubles; and org.apache.spark.rdd.SequenceFileRDDFunctions contains operations available on RDDs that can be saved as SequenceFiles. These operations are automatically available on any RDD of the right type (e.g. RDD[(Int, Int)] through implicit conversions.

Java programmers should reference the org.apache.spark.api.java package for Spark programming APIs in Java.

Classes and methods marked with Experimental are user-facing features which have not been officially adopted by the Spark project. These are subject to change or removal in minor releases.

Classes and methods marked with Developer API are intended for advanced users want to extend Spark through lower level interfaces. These are subject to changes or removal in minor releases.

Definition Classes: apache

package api

Definition Classes: spark

package broadcast

Spark's broadcast variables, used to broadcast immutable datasets to all nodes.

Definition Classes: spark

Broadcast

package deploy

Definition Classes: spark

package executor

Executor components used with various cluster managers.

Executor components used with various cluster managers. See org.apache.spark.executor.Executor.

Definition Classes: spark

package input

Definition Classes: spark

package internal

Definition Classes: spark

package io

IO codecs used for compression.

IO codecs used for compression. See org.apache.spark.io.CompressionCodec.

Definition Classes: spark

package mapred

Definition Classes: spark

package memory

This package implements Spark's memory management system.

This package implements Spark's memory management system. This system consists of two main components, a JVM-wide memory manager and a per-task manager:

org.apache.spark.memory.MemoryManager manages Spark's overall memory usage within a JVM. This component implements the policies for dividing the available memory across tasks and for allocating memory between storage (memory used caching and data transfer) and execution (memory used by computations, such as shuffles, joins, sorts, and aggregations).
org.apache.spark.memory.TaskMemoryManager manages the memory allocated by individual tasks. Tasks interact with TaskMemoryManager and never directly interact with the JVM-wide MemoryManager.

Internally, each of these components have additional abstractions for memory bookkeeping:

org.apache.spark.memory.MemoryConsumers are clients of the TaskMemoryManager and correspond to individual operators and data structures within a task. The TaskMemoryManager receives memory allocation requests from MemoryConsumers and issues callbacks to consumers in order to trigger spilling when running low on memory.
org.apache.spark.memory.MemoryPools are a bookkeeping abstraction used by the MemoryManager to track the division of memory between storage and execution.

Diagrammatically:

                                                       +---------------------------+
+-------------+                                        |       MemoryManager       |
| MemConsumer |----+                                   |                           |
+-------------+    |    +-------------------+          |  +---------------------+  |
                   +--->| TaskMemoryManager |----+     |  |OnHeapStorageMemPool |  |
+-------------+    |    +-------------------+    |     |  +---------------------+  |
| MemConsumer |----+                             |     |                           |
+-------------+         +-------------------+    |     |  +---------------------+  |
                        | TaskMemoryManager |----+     |  |OffHeapStorageMemPool|  |
                        +-------------------+    |     |  +---------------------+  |
                                                 +---->|                           |
                                 *               |     |  +---------------------+  |
                                 *               |     |  |OnHeapExecMemPool    |  |
+-------------+                  *               |     |  +---------------------+  |
| MemConsumer |----+                             |     |                           |
+-------------+    |    +-------------------+    |     |  +---------------------+  |
                   +--->| TaskMemoryManager |----+     |  |OffHeapExecMemPool   |  |
                        +-------------------+          |  +---------------------+  |
                                                       |                           |
                                                       +---------------------------+

There is one implementation of org.apache.spark.memory.MemoryManager:

org.apache.spark.memory.UnifiedMemoryManager enforces soft boundaries between storage and execution memory, allowing requests for memory in one region to be fulfilled by borrowing memory from the other.

Definition Classes: spark

package metrics

Definition Classes: spark

package network

Definition Classes: spark

package partial

Support for approximate results.

Support for approximate results. This provides convenient api and also implementation for approximate calculation.

Definition Classes: spark
See also: org.apache.spark.rdd.RDD.countApprox

package rdd

Provides several RDD implementations.

Provides several RDD implementations. See org.apache.spark.rdd.RDD.

Definition Classes: spark

package resource

Definition Classes: spark

package scheduler

Spark's scheduling components.

Spark's scheduling components. This includes the org.apache.spark.scheduler.DAGScheduler and lower level org.apache.spark.scheduler.TaskScheduler.

Definition Classes: spark

package security

Definition Classes: spark

package serializer

Pluggable serializers for RDD and shuffle data.

Definition Classes: spark
See also: org.apache.spark.serializer.Serializer

package shuffle

Definition Classes: spark

package status

Definition Classes: spark

package storage

Definition Classes: spark

package unsafe

Definition Classes: spark

package util

Spark utilities.

Definition Classes: spark

org.apache.spark

broadcast

package broadcast

Spark's broadcast variables, used to broadcast immutable datasets to all nodes.

Linear Supertypes

AnyRef, Any

Type Members

abstract class Broadcast[T] extends Serializable with Logging
A broadcast variable.
A broadcast variable. Broadcast variables allow the programmer to keep a read-only variable cached on each machine rather than shipping a copy of it with tasks. They can be used, for example, to give every node a copy of a large input dataset in an efficient manner. Spark also attempts to distribute broadcast variables using efficient broadcast algorithms to reduce communication cost.
Broadcast variables are created from a variable v by calling org.apache.spark.SparkContext#broadcast. The broadcast variable is a wrapper around v, and its value can be accessed by calling the value method. The interpreter session below shows this:
```
scala> val broadcastVar = sc.broadcast(Array(1, 2, 3))
broadcastVar: org.apache.spark.broadcast.Broadcast[Array[Int]] = Broadcast(0)

scala> broadcastVar.value
res0: Array[Int] = Array(1, 2, 3)
```
After the broadcast variable is created, it should be used instead of the value v in any functions run on the cluster so that v is not shipped to the nodes more than once. In addition, the object v should not be modified after it is broadcast in order to ensure that all nodes get the same value of the broadcast variable (e.g. if the variable is shipped to a new node later).
T
Type of the data contained in the broadcast variable.

Packages

broadcast

package broadcast

Type Members

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Packages

broadcast 

package broadcast

Type Members

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broadcast