org.apache.spark

Class SparkConf

Object

org.apache.spark.SparkConf

All Implemented Interfaces:

Cloneable, Logging

public class SparkConf
extends Object
implements scala.Cloneable, Logging

Configuration for a Spark application. Used to set various Spark parameters as key-value pairs.

Most of the time, you would create a SparkConf object with new SparkConf(), which will load values from any spark.* Java system properties set in your application as well. In this case, parameters you set directly on the SparkConf object take priority over system properties.

For unit tests, you can also call new SparkConf(false) to skip loading external settings and get the same configuration no matter what the system properties are.

All setter methods in this class support chaining. For example, you can write new SparkConf().setMaster("local").setAppName("My app").

Note that once a SparkConf object is passed to Spark, it is cloned and can no longer be modified by the user. Spark does not support modifying the configuration at runtime.

Constructor Summary

Constructors

Constructor and Description
SparkConf() Create a SparkConf that loads defaults from system properties and the classpath
SparkConf(boolean loadDefaults)

Method Summary

Methods

Modifier and Type	Method and Description
SparkConf	clone() Copy this object
boolean	contains(String key) Does the configuration contain a given parameter?
String	get(String key) Get a parameter; throws a NoSuchElementException if it's not set
String	get(String key, String defaultValue) Get a parameter, falling back to a default if not set
scala.collection.Seq<scala.Tuple2<String,String>>	getAkkaConf() Get all akka conf variables set on this SparkConf
scala.Tuple2<String,String>[]	getAll() Get all parameters as a list of pairs
String	getAppId() Returns the Spark application id, valid in the Driver after TaskScheduler registration and from the start in the Executor.
boolean	getBoolean(String key, boolean defaultValue) Get a parameter as a boolean, falling back to a default if not set
double	getDouble(String key, double defaultValue) Get a parameter as a double, falling back to a default if not set
String	getenv(String name) By using this instead of System.getenv(), environment variables can be mocked in unit tests.
scala.collection.Seq<scala.Tuple2<String,String>>	getExecutorEnv() Get all executor environment variables set on this SparkConf
int	getInt(String key, int defaultValue) Get a parameter as an integer, falling back to a default if not set
long	getLong(String key, long defaultValue) Get a parameter as a long, falling back to a default if not set
scala.Option<String>	getOption(String key) Get a parameter as an Option
static boolean	isAkkaConf(String name) Return whether the given config is an akka config (e.g.
static boolean	isExecutorStartupConf(String name) Return whether the given config should be passed to an executor on start-up.
static boolean	isSparkPortConf(String name) Return true if the given config matches either spark.*.port or spark.port.*.
SparkConf	registerKryoClasses(Class<?>[] classes) Use Kryo serialization and register the given set of classes with Kryo.
SparkConf	remove(String key) Remove a parameter from the configuration
SparkConf	set(String key, String value) Set a configuration variable.
SparkConf	setAll(scala.collection.Traversable<scala.Tuple2<String,String>> settings) Set multiple parameters together
SparkConf	setAppName(String name) Set a name for your application.
SparkConf	setExecutorEnv(scala.collection.Seq<scala.Tuple2<String,String>> variables) Set multiple environment variables to be used when launching executors.
SparkConf	setExecutorEnv(String variable, String value) Set an environment variable to be used when launching executors for this application.
SparkConf	setExecutorEnv(scala.Tuple2<String,String>[] variables) Set multiple environment variables to be used when launching executors.
SparkConf	setIfMissing(String key, String value) Set a parameter if it isn't already configured
SparkConf	setJars(scala.collection.Seq<String> jars) Set JAR files to distribute to the cluster.
SparkConf	setJars(String[] jars) Set JAR files to distribute to the cluster.
SparkConf	setMaster(String master) The master URL to connect to, such as "local" to run locally with one thread, "local[4]" to run locally with 4 cores, or "spark://master:7077" to run on a Spark standalone cluster.
SparkConf	setSparkHome(String home) Set the location where Spark is installed on worker nodes.
String	toDebugString() Return a string listing all keys and values, one per line.
static String	translateConfKey(String userKey, boolean warn) Translate the configuration key if it is deprecated and has a replacement, otherwise just returns the provided key.
void	validateSettings() Checks for illegal or deprecated config settings.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, 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

SparkConf

public SparkConf(boolean loadDefaults)

SparkConf

public SparkConf()

Create a SparkConf that loads defaults from system properties and the classpath

Method Detail

isAkkaConf

public static boolean isAkkaConf(String name)

Return whether the given config is an akka config (e.g. akka.actor.provider). Note that this does not include spark-specific akka configs (e.g. spark.akka.timeout).

isExecutorStartupConf

public static boolean isExecutorStartupConf(String name)

Return whether the given config should be passed to an executor on start-up.

Certain akka and authentication configs are required of the executor when it connects to the scheduler, while the rest of the spark configs can be inherited from the driver later.

isSparkPortConf

public static boolean isSparkPortConf(String name)

Return true if the given config matches either spark.*.port or spark.port.*.

translateConfKey

public static String translateConfKey(String userKey,
                      boolean warn)

Translate the configuration key if it is deprecated and has a replacement, otherwise just returns the provided key.

Parameters:

userKey - Configuration key from the user / caller.

warn - Whether to print a warning if the key is deprecated. Warnings will be printed only once for each key.

set

public SparkConf set(String key,
            String value)

Set a configuration variable.

setMaster

public SparkConf setMaster(String master)

The master URL to connect to, such as "local" to run locally with one thread, "local[4]" to run locally with 4 cores, or "spark://master:7077" to run on a Spark standalone cluster.

setAppName

public SparkConf setAppName(String name)

Set a name for your application. Shown in the Spark web UI.

setJars

public SparkConf setJars(scala.collection.Seq<String> jars)

Set JAR files to distribute to the cluster.

setJars

public SparkConf setJars(String[] jars)

Set JAR files to distribute to the cluster. (Java-friendly version.)

setExecutorEnv

public SparkConf setExecutorEnv(String variable,
                       String value)

Set an environment variable to be used when launching executors for this application. These variables are stored as properties of the form spark.executorEnv.VAR_NAME (for example spark.executorEnv.PATH) but this method makes them easier to set.

setExecutorEnv

public SparkConf setExecutorEnv(scala.collection.Seq<scala.Tuple2<String,String>> variables)

Set multiple environment variables to be used when launching executors. These variables are stored as properties of the form spark.executorEnv.VAR_NAME (for example spark.executorEnv.PATH) but this method makes them easier to set.

setExecutorEnv

public SparkConf setExecutorEnv(scala.Tuple2<String,String>[] variables)

Set multiple environment variables to be used when launching executors. (Java-friendly version.)

setSparkHome

public SparkConf setSparkHome(String home)

Set the location where Spark is installed on worker nodes.

setAll

public SparkConf setAll(scala.collection.Traversable<scala.Tuple2<String,String>> settings)

Set multiple parameters together

setIfMissing

public SparkConf setIfMissing(String key,
                     String value)

Set a parameter if it isn't already configured

registerKryoClasses

public SparkConf registerKryoClasses(Class<?>[] classes)

Use Kryo serialization and register the given set of classes with Kryo. If called multiple times, this will append the classes from all calls together.

remove

public SparkConf remove(String key)

Remove a parameter from the configuration

get

public String get(String key)

Get a parameter; throws a NoSuchElementException if it's not set

get

public String get(String key,
         String defaultValue)

Get a parameter, falling back to a default if not set

getOption

public scala.Option<String> getOption(String key)

Get a parameter as an Option

getAll

public scala.Tuple2<String,String>[] getAll()

Get all parameters as a list of pairs

getInt

public int getInt(String key,
         int defaultValue)

Get a parameter as an integer, falling back to a default if not set

getLong

public long getLong(String key,
           long defaultValue)

Get a parameter as a long, falling back to a default if not set

getDouble

public double getDouble(String key,
               double defaultValue)

Get a parameter as a double, falling back to a default if not set

getBoolean

public boolean getBoolean(String key,
                 boolean defaultValue)

Get a parameter as a boolean, falling back to a default if not set

getExecutorEnv

public scala.collection.Seq<scala.Tuple2<String,String>> getExecutorEnv()

Get all executor environment variables set on this SparkConf

getAkkaConf

public scala.collection.Seq<scala.Tuple2<String,String>> getAkkaConf()

Get all akka conf variables set on this SparkConf

getAppId

public String getAppId()

Returns the Spark application id, valid in the Driver after TaskScheduler registration and from the start in the Executor.

contains

public boolean contains(String key)

Does the configuration contain a given parameter?

clone

public SparkConf clone()

Copy this object

Overrides:

clone in class Object

getenv

public String getenv(String name)

By using this instead of System.getenv(), environment variables can be mocked in unit tests.

validateSettings

public void validateSettings()

Checks for illegal or deprecated config settings. Throws an exception for the former. Not idempotent - may mutate this conf object to convert deprecated settings to supported ones.

toDebugString

public String toDebugString()

Return a string listing all keys and values, one per line. This is useful to print the configuration out for debugging.