Spark 3.0.0 ScalaDoc - org.apache.spark.SparkContext

final def !=(arg0: Any): Boolean

Definition Classes: AnyRef → Any

final def ##(): Int

Definition Classes: AnyRef → Any

final def ==(arg0: Any): Boolean

Definition Classes: AnyRef → Any

def addFile(path: String, recursive: Boolean): Unit

Add a file to be downloaded with this Spark job on every node.

If a file is added during execution, it will not be available until the next TaskSet starts.

path: can be either a local file, a file in HDFS (or other Hadoop-supported filesystems), or an HTTP, HTTPS or FTP URI. To access the file in Spark jobs, use SparkFiles.get(fileName) to find its download location.
recursive: if true, a directory can be given in path. Currently directories are only supported for Hadoop-supported filesystems.

Note: A path can be added only once. Subsequent additions of the same path are ignored.

def addFile(path: String): Unit

Add a file to be downloaded with this Spark job on every node.

If a file is added during execution, it will not be available until the next TaskSet starts.

path: can be either a local file, a file in HDFS (or other Hadoop-supported filesystems), or an HTTP, HTTPS or FTP URI. To access the file in Spark jobs, use SparkFiles.get(fileName) to find its download location.

Note: A path can be added only once. Subsequent additions of the same path are ignored.

def addJar(path: String): Unit

Adds a JAR dependency for all tasks to be executed on this SparkContext in the future.

If a jar is added during execution, it will not be available until the next TaskSet starts.

path: can be either a local file, a file in HDFS (or other Hadoop-supported filesystems), an HTTP, HTTPS or FTP URI, or local:/path for a file on every worker node.

Note: A path can be added only once. Subsequent additions of the same path are ignored.

def addSparkListener(listener: SparkListenerInterface): Unit

:: DeveloperApi :: Register a listener to receive up-calls from events that happen during execution.

Annotations: @DeveloperApi()

def appName: String

def applicationAttemptId: Option[String]

def applicationId: String

A unique identifier for the Spark application.

A unique identifier for the Spark application. Its format depends on the scheduler implementation. (i.e. in case of local spark app something like 'local-1433865536131' in case of YARN something like 'application_1433865536131_34483' in case of MESOS something like 'driver-20170926223339-0001' )

final def asInstanceOf[T0]: T0

Definition Classes: Any

def binaryFiles(path: String, minPartitions: Int = defaultMinPartitions): RDD[(String, PortableDataStream)]

Get an RDD for a Hadoop-readable dataset as PortableDataStream for each file (useful for binary data)

For example, if you have the following files:

hdfs://a-hdfs-path/part-00000
hdfs://a-hdfs-path/part-00001
...
hdfs://a-hdfs-path/part-nnnnn

Do val rdd = sparkContext.binaryFiles("hdfs://a-hdfs-path"),

then rdd contains

(a-hdfs-path/part-00000, its content)
(a-hdfs-path/part-00001, its content)
...
(a-hdfs-path/part-nnnnn, its content)

path: Directory to the input data files, the path can be comma separated paths as the list of inputs.
minPartitions: A suggestion value of the minimal splitting number for input data.
returns: RDD representing tuples of file path and corresponding file content

Note: Small files are preferred; very large files may cause bad performance.
,
On some filesystems, .../path/* can be a more efficient way to read all files in a directory rather than .../path/ or .../path
,
Partitioning is determined by data locality. This may result in too few partitions by default.

def binaryRecords(path: String, recordLength: Int, conf: Configuration = hadoopConfiguration): RDD[Array[Byte]]

Load data from a flat binary file, assuming the length of each record is constant.

path: Directory to the input data files, the path can be comma separated paths as the list of inputs.
recordLength: The length at which to split the records
conf: Configuration for setting up the dataset.
returns: An RDD of data with values, represented as byte arrays

Note: We ensure that the byte array for each record in the resulting RDD has the provided record length.

def broadcast[T](value: T)(implicit arg0: ClassTag[T]): Broadcast[T]

Broadcast a read-only variable to the cluster, returning a org.apache.spark.broadcast.Broadcast object for reading it in distributed functions.

Broadcast a read-only variable to the cluster, returning a org.apache.spark.broadcast.Broadcast object for reading it in distributed functions. The variable will be sent to each cluster only once.

value: value to broadcast to the Spark nodes
returns: Broadcast object, a read-only variable cached on each machine

def cancelAllJobs(): Unit

Cancel all jobs that have been scheduled or are running.

def cancelJob(jobId: Int): Unit

Cancel a given job if it's scheduled or running.

jobId: the job ID to cancel

Note: Throws InterruptedException if the cancel message cannot be sent

def cancelJob(jobId: Int, reason: String): Unit

Cancel a given job if it's scheduled or running.

jobId: the job ID to cancel
reason: optional reason for cancellation

Note: Throws InterruptedException if the cancel message cannot be sent

def cancelJobGroup(groupId: String): Unit

Cancel active jobs for the specified group.

Cancel active jobs for the specified group. See org.apache.spark.SparkContext.setJobGroup for more information.

def cancelStage(stageId: Int): Unit

Cancel a given stage and all jobs associated with it.

stageId: the stage ID to cancel

Note: Throws InterruptedException if the cancel message cannot be sent

def cancelStage(stageId: Int, reason: String): Unit

Cancel a given stage and all jobs associated with it.

stageId: the stage ID to cancel
reason: reason for cancellation

Note: Throws InterruptedException if the cancel message cannot be sent

def checkpointFile[T](path: String)(implicit arg0: ClassTag[T]): RDD[T]

Attributes: protected[org.apache.spark]

def clearCallSite(): Unit

Clear the thread-local property for overriding the call sites of actions and RDDs.

def clearJobGroup(): Unit

Clear the current thread's job group ID and its description.

def clone(): AnyRef

Attributes: protected[java.lang]
Definition Classes: AnyRef
Annotations: @native() @throws( ... )

def collectionAccumulator[T](name: String): CollectionAccumulator[T]

Create and register a CollectionAccumulator, which starts with empty list and accumulates inputs by adding them into the list.

def collectionAccumulator[T]: CollectionAccumulator[T]

Create and register a CollectionAccumulator, which starts with empty list and accumulates inputs by adding them into the list.

def defaultMinPartitions: Int

Default min number of partitions for Hadoop RDDs when not given by user Notice that we use math.min so the "defaultMinPartitions" cannot be higher than 2.

Default min number of partitions for Hadoop RDDs when not given by user Notice that we use math.min so the "defaultMinPartitions" cannot be higher than 2. The reasons for this are discussed in https://github.com/mesos/spark/pull/718

def defaultParallelism: Int

Default level of parallelism to use when not given by user (e.g.

Default level of parallelism to use when not given by user (e.g. parallelize and makeRDD).

def deployMode: String

def doubleAccumulator(name: String): DoubleAccumulator

Create and register a double accumulator, which starts with 0 and accumulates inputs by add.

def doubleAccumulator: DoubleAccumulator

Create and register a double accumulator, which starts with 0 and accumulates inputs by add.

def emptyRDD[T](implicit arg0: ClassTag[T]): RDD[T]

Get an RDD that has no partitions or elements.

final def eq(arg0: AnyRef): Boolean

Definition Classes: AnyRef

def equals(arg0: Any): Boolean

Definition Classes: AnyRef → Any

def files: Seq[String]

def finalize(): Unit

Attributes: protected[java.lang]
Definition Classes: AnyRef
Annotations: @throws( classOf[java.lang.Throwable] )

def getAllPools: Seq[Schedulable]

:: DeveloperApi :: Return pools for fair scheduler

Annotations: @DeveloperApi()

def getCheckpointDir: Option[String]

final def getClass(): Class[_]

Definition Classes: AnyRef → Any
Annotations: @native()

def getConf: SparkConf

Return a copy of this SparkContext's configuration.

Return a copy of this SparkContext's configuration. The configuration cannot be changed at runtime.

def getExecutorMemoryStatus: Map[String, (Long, Long)]

Return a map from the slave to the max memory available for caching and the remaining memory available for caching.

def getLocalProperty(key: String): String

Get a local property set in this thread, or null if it is missing.

Get a local property set in this thread, or null if it is missing. See org.apache.spark.SparkContext.setLocalProperty.

def getPersistentRDDs: Map[Int, RDD[_]]

Returns an immutable map of RDDs that have marked themselves as persistent via cache() call.

Note: This does not necessarily mean the caching or computation was successful.

def getPoolForName(pool: String): Option[Schedulable]

:: DeveloperApi :: Return the pool associated with the given name, if one exists

Annotations: @DeveloperApi()

def getRDDStorageInfo: Array[RDDInfo]

:: DeveloperApi :: Return information about what RDDs are cached, if they are in mem or on disk, how much space they take, etc.

Annotations: @DeveloperApi()

def getSchedulingMode: SchedulingMode

Return current scheduling mode

def hadoopConfiguration: Configuration

A default Hadoop Configuration for the Hadoop code (e.g.

A default Hadoop Configuration for the Hadoop code (e.g. file systems) that we reuse.

Note: As it will be reused in all Hadoop RDDs, it's better not to modify it unless you plan to set some global configurations for all Hadoop RDDs.

def hadoopFile[K, V, F <: InputFormat[K, V]](path: String)(implicit km: ClassTag[K], vm: ClassTag[V], fm: ClassTag[F]): RDD[(K, V)]

Smarter version of hadoopFile() that uses class tags to figure out the classes of keys, values and the InputFormat so that users don't need to pass them directly.

Smarter version of hadoopFile() that uses class tags to figure out the classes of keys, values and the InputFormat so that users don't need to pass them directly. Instead, callers can just write, for example,

val file = sparkContext.hadoopFile[LongWritable, Text, TextInputFormat](path)

path: directory to the input data files, the path can be comma separated paths as a list of inputs
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def hadoopFile[K, V, F <: InputFormat[K, V]](path: String, minPartitions: Int)(implicit km: ClassTag[K], vm: ClassTag[V], fm: ClassTag[F]): RDD[(K, V)]

Smarter version of hadoopFile() that uses class tags to figure out the classes of keys, values and the InputFormat so that users don't need to pass them directly.

Smarter version of hadoopFile() that uses class tags to figure out the classes of keys, values and the InputFormat so that users don't need to pass them directly. Instead, callers can just write, for example,

val file = sparkContext.hadoopFile[LongWritable, Text, TextInputFormat](path, minPartitions)

path: directory to the input data files, the path can be comma separated paths as a list of inputs
minPartitions: suggested minimum number of partitions for the resulting RDD
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def hadoopFile[K, V](path: String, inputFormatClass: Class[_ <: InputFormat[K, V]], keyClass: Class[K], valueClass: Class[V], minPartitions: Int = defaultMinPartitions): RDD[(K, V)]

Get an RDD for a Hadoop file with an arbitrary InputFormat

path: directory to the input data files, the path can be comma separated paths as a list of inputs
inputFormatClass: storage format of the data to be read
keyClass: Class of the key associated with the inputFormatClass parameter
valueClass: Class of the value associated with the inputFormatClass parameter
minPartitions: suggested minimum number of partitions for the resulting RDD
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def hadoopRDD[K, V](conf: JobConf, inputFormatClass: Class[_ <: InputFormat[K, V]], keyClass: Class[K], valueClass: Class[V], minPartitions: Int = defaultMinPartitions): RDD[(K, V)]

Get an RDD for a Hadoop-readable dataset from a Hadoop JobConf given its InputFormat and other necessary info (e.g.

Get an RDD for a Hadoop-readable dataset from a Hadoop JobConf given its InputFormat and other necessary info (e.g. file name for a filesystem-based dataset, table name for HyperTable), using the older MapReduce API (org.apache.hadoop.mapred).

conf: JobConf for setting up the dataset. Note: This will be put into a Broadcast. Therefore if you plan to reuse this conf to create multiple RDDs, you need to make sure you won't modify the conf. A safe approach is always creating a new conf for a new RDD.
inputFormatClass: storage format of the data to be read
keyClass: Class of the key associated with the inputFormatClass parameter
valueClass: Class of the value associated with the inputFormatClass parameter
minPartitions: Minimum number of Hadoop Splits to generate.
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def hashCode(): Int

Definition Classes: AnyRef → Any
Annotations: @native()

def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean = false): Boolean

Attributes: protected
Definition Classes: Logging

def initializeLogIfNecessary(isInterpreter: Boolean): Unit

Attributes: protected
Definition Classes: Logging

final def isInstanceOf[T0]: Boolean

Definition Classes: Any

def isLocal: Boolean

def isStopped: Boolean

returns: true if context is stopped or in the midst of stopping.

def isTraceEnabled(): Boolean

Attributes: protected
Definition Classes: Logging

def jars: Seq[String]

def killExecutor(executorId: String): Boolean

:: DeveloperApi :: Request that the cluster manager kill the specified executor.

returns: whether the request is received.

Annotations: @DeveloperApi()
Note: This is an indication to the cluster manager that the application wishes to adjust its resource usage downwards. If the application wishes to replace the executor it kills through this method with a new one, it should follow up explicitly with a call to {{SparkContext#requestExecutors}}.

def killExecutors(executorIds: Seq[String]): Boolean

:: DeveloperApi :: Request that the cluster manager kill the specified executors.

This is not supported when dynamic allocation is turned on.

returns: whether the request is received.

Annotations: @DeveloperApi()
Note: This is an indication to the cluster manager that the application wishes to adjust its resource usage downwards. If the application wishes to replace the executors it kills through this method with new ones, it should follow up explicitly with a call to {{SparkContext#requestExecutors}}.

def killTaskAttempt(taskId: Long, interruptThread: Boolean = true, reason: String = ...): Boolean

Kill and reschedule the given task attempt.

Kill and reschedule the given task attempt. Task ids can be obtained from the Spark UI or through SparkListener.onTaskStart.

taskId: the task ID to kill. This id uniquely identifies the task attempt.
interruptThread: whether to interrupt the thread running the task.
reason: the reason for killing the task, which should be a short string. If a task is killed multiple times with different reasons, only one reason will be reported.
returns: Whether the task was successfully killed.

def listFiles(): Seq[String]

Returns a list of file paths that are added to resources.

def listJars(): Seq[String]

Returns a list of jar files that are added to resources.

val localProperties: InheritableThreadLocal[Properties]

Attributes: protected[org.apache.spark]

def log: Logger

Attributes: protected
Definition Classes: Logging

def logDebug(msg: ⇒ String, throwable: Throwable): Unit

Attributes: protected
Definition Classes: Logging

def logDebug(msg: ⇒ String): Unit

Attributes: protected
Definition Classes: Logging

def logError(msg: ⇒ String, throwable: Throwable): Unit

Attributes: protected
Definition Classes: Logging

def logError(msg: ⇒ String): Unit

Attributes: protected
Definition Classes: Logging

def logInfo(msg: ⇒ String, throwable: Throwable): Unit

Attributes: protected
Definition Classes: Logging

def logInfo(msg: ⇒ String): Unit

Attributes: protected
Definition Classes: Logging

def logName: String

Attributes: protected
Definition Classes: Logging

def logTrace(msg: ⇒ String, throwable: Throwable): Unit

Attributes: protected
Definition Classes: Logging

def logTrace(msg: ⇒ String): Unit

Attributes: protected
Definition Classes: Logging

def logWarning(msg: ⇒ String, throwable: Throwable): Unit

Attributes: protected
Definition Classes: Logging

def logWarning(msg: ⇒ String): Unit

Attributes: protected
Definition Classes: Logging

def longAccumulator(name: String): LongAccumulator

Create and register a long accumulator, which starts with 0 and accumulates inputs by add.

def longAccumulator: LongAccumulator

Create and register a long accumulator, which starts with 0 and accumulates inputs by add.

def makeRDD[T](seq: Seq[(T, Seq[String])])(implicit arg0: ClassTag[T]): RDD[T]

Distribute a local Scala collection to form an RDD, with one or more location preferences (hostnames of Spark nodes) for each object.

Distribute a local Scala collection to form an RDD, with one or more location preferences (hostnames of Spark nodes) for each object. Create a new partition for each collection item.

seq: list of tuples of data and location preferences (hostnames of Spark nodes)
returns: RDD representing data partitioned according to location preferences

def makeRDD[T](seq: Seq[T], numSlices: Int = defaultParallelism)(implicit arg0: ClassTag[T]): RDD[T]

Distribute a local Scala collection to form an RDD.

This method is identical to parallelize.

seq: Scala collection to distribute
numSlices: number of partitions to divide the collection into
returns: RDD representing distributed collection

def master: String

final def ne(arg0: AnyRef): Boolean

Definition Classes: AnyRef

def newAPIHadoopFile[K, V, F <: InputFormat[K, V]](path: String, fClass: Class[F], kClass: Class[K], vClass: Class[V], conf: Configuration = hadoopConfiguration): RDD[(K, V)]

Get an RDD for a given Hadoop file with an arbitrary new API InputFormat and extra configuration options to pass to the input format.

path: directory to the input data files, the path can be comma separated paths as a list of inputs
fClass: storage format of the data to be read
kClass: Class of the key associated with the fClass parameter
vClass: Class of the value associated with the fClass parameter
conf: Hadoop configuration
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def newAPIHadoopFile[K, V, F <: InputFormat[K, V]](path: String)(implicit km: ClassTag[K], vm: ClassTag[V], fm: ClassTag[F]): RDD[(K, V)]

Smarter version of newApiHadoopFile that uses class tags to figure out the classes of keys, values and the org.apache.hadoop.mapreduce.InputFormat (new MapReduce API) so that user don't need to pass them directly.

Smarter version of newApiHadoopFile that uses class tags to figure out the classes of keys, values and the org.apache.hadoop.mapreduce.InputFormat (new MapReduce API) so that user don't need to pass them directly. Instead, callers can just write, for example: val file = sparkContext.hadoopFile[LongWritable, Text, TextInputFormat](path)

path: directory to the input data files, the path can be comma separated paths as a list of inputs
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def newAPIHadoopRDD[K, V, F <: InputFormat[K, V]](conf: Configuration = hadoopConfiguration, fClass: Class[F], kClass: Class[K], vClass: Class[V]): RDD[(K, V)]

Get an RDD for a given Hadoop file with an arbitrary new API InputFormat and extra configuration options to pass to the input format.

conf: Configuration for setting up the dataset. Note: This will be put into a Broadcast. Therefore if you plan to reuse this conf to create multiple RDDs, you need to make sure you won't modify the conf. A safe approach is always creating a new conf for a new RDD.
fClass: storage format of the data to be read
kClass: Class of the key associated with the fClass parameter
vClass: Class of the value associated with the fClass parameter

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

final def notify(): Unit

Definition Classes: AnyRef
Annotations: @native()

final def notifyAll(): Unit

Definition Classes: AnyRef
Annotations: @native()

def objectFile[T](path: String, minPartitions: Int = defaultMinPartitions)(implicit arg0: ClassTag[T]): RDD[T]

Load an RDD saved as a SequenceFile containing serialized objects, with NullWritable keys and BytesWritable values that contain a serialized partition.

Load an RDD saved as a SequenceFile containing serialized objects, with NullWritable keys and BytesWritable values that contain a serialized partition. This is still an experimental storage format and may not be supported exactly as is in future Spark releases. It will also be pretty slow if you use the default serializer (Java serialization), though the nice thing about it is that there's very little effort required to save arbitrary objects.

path: directory to the input data files, the path can be comma separated paths as a list of inputs
minPartitions: suggested minimum number of partitions for the resulting RDD
returns: RDD representing deserialized data from the file(s)

def parallelize[T](seq: Seq[T], numSlices: Int = defaultParallelism)(implicit arg0: ClassTag[T]): RDD[T]

Distribute a local Scala collection to form an RDD.

seq: Scala collection to distribute
numSlices: number of partitions to divide the collection into
returns: RDD representing distributed collection

Note: Parallelize acts lazily. If seq is a mutable collection and is altered after the call to parallelize and before the first action on the RDD, the resultant RDD will reflect the modified collection. Pass a copy of the argument to avoid this.
,
avoid using parallelize(Seq()) to create an empty RDD. Consider emptyRDD for an RDD with no partitions, or parallelize(Seq[T]()) for an RDD of T with empty partitions.

def range(start: Long, end: Long, step: Long = 1, numSlices: Int = defaultParallelism): RDD[Long]

Creates a new RDD[Long] containing elements from start to end(exclusive), increased by step every element.

start: the start value.
end: the end value.
step: the incremental step
numSlices: number of partitions to divide the collection into
returns: RDD representing distributed range

Note: if we need to cache this RDD, we should make sure each partition does not exceed limit.

def register(acc: AccumulatorV2[_, _], name: String): Unit

Register the given accumulator with given name.

Note: Accumulators must be registered before use, or it will throw exception.

def register(acc: AccumulatorV2[_, _]): Unit

Register the given accumulator.

Note: Accumulators must be registered before use, or it will throw exception.

def removeSparkListener(listener: SparkListenerInterface): Unit

:: DeveloperApi :: Deregister the listener from Spark's listener bus.

Annotations: @DeveloperApi()

def requestExecutors(numAdditionalExecutors: Int): Boolean

:: DeveloperApi :: Request an additional number of executors from the cluster manager.

returns: whether the request is received.

Annotations: @DeveloperApi()

def requestTotalExecutors(numExecutors: Int, localityAwareTasks: Int, hostToLocalTaskCount: Map[String, Int]): Boolean

Update the cluster manager on our scheduling needs.

Update the cluster manager on our scheduling needs. Three bits of information are included to help it make decisions.

numExecutors: The total number of executors we'd like to have. The cluster manager shouldn't kill any running executor to reach this number, but, if all existing executors were to die, this is the number of executors we'd want to be allocated.
localityAwareTasks: The number of tasks in all active stages that have a locality preferences. This includes running, pending, and completed tasks.
hostToLocalTaskCount: A map of hosts to the number of tasks from all active stages that would like to like to run on that host. This includes running, pending, and completed tasks.
returns: whether the request is acknowledged by the cluster manager.

Annotations: @DeveloperApi()

def runApproximateJob[T, U, R](rdd: RDD[T], func: (TaskContext, Iterator[T]) ⇒ U, evaluator: ApproximateEvaluator[U, R], timeout: Long): PartialResult[R]

:: DeveloperApi :: Run a job that can return approximate results.

rdd: target RDD to run tasks on
func: a function to run on each partition of the RDD
evaluator: ApproximateEvaluator to receive the partial results
timeout: maximum time to wait for the job, in milliseconds
returns: partial result (how partial depends on whether the job was finished before or after timeout)

Annotations: @DeveloperApi()

def runJob[T, U](rdd: RDD[T], processPartition: (Iterator[T]) ⇒ U, resultHandler: (Int, U) ⇒ Unit)(implicit arg0: ClassTag[U]): Unit

Run a job on all partitions in an RDD and pass the results to a handler function.

rdd: target RDD to run tasks on
processPartition: a function to run on each partition of the RDD
resultHandler: callback to pass each result to

def runJob[T, U](rdd: RDD[T], processPartition: (TaskContext, Iterator[T]) ⇒ U, resultHandler: (Int, U) ⇒ Unit)(implicit arg0: ClassTag[U]): Unit

Run a job on all partitions in an RDD and pass the results to a handler function.

Run a job on all partitions in an RDD and pass the results to a handler function. The function that is run against each partition additionally takes TaskContext argument.

rdd: target RDD to run tasks on
processPartition: a function to run on each partition of the RDD
resultHandler: callback to pass each result to

def runJob[T, U](rdd: RDD[T], func: (Iterator[T]) ⇒ U)(implicit arg0: ClassTag[U]): Array[U]

Run a job on all partitions in an RDD and return the results in an array.

rdd: target RDD to run tasks on
func: a function to run on each partition of the RDD
returns: in-memory collection with a result of the job (each collection element will contain a result from one partition)

def runJob[T, U](rdd: RDD[T], func: (TaskContext, Iterator[T]) ⇒ U)(implicit arg0: ClassTag[U]): Array[U]

Run a job on all partitions in an RDD and return the results in an array.

Run a job on all partitions in an RDD and return the results in an array. The function that is run against each partition additionally takes TaskContext argument.

rdd: target RDD to run tasks on
func: a function to run on each partition of the RDD
returns: in-memory collection with a result of the job (each collection element will contain a result from one partition)

def runJob[T, U](rdd: RDD[T], func: (Iterator[T]) ⇒ U, partitions: Seq[Int])(implicit arg0: ClassTag[U]): Array[U]

Run a function on a given set of partitions in an RDD and return the results as an array.

rdd: target RDD to run tasks on
func: a function to run on each partition of the RDD
partitions: set of partitions to run on; some jobs may not want to compute on all partitions of the target RDD, e.g. for operations like first()
returns: in-memory collection with a result of the job (each collection element will contain a result from one partition)

def runJob[T, U](rdd: RDD[T], func: (TaskContext, Iterator[T]) ⇒ U, partitions: Seq[Int])(implicit arg0: ClassTag[U]): Array[U]

Run a function on a given set of partitions in an RDD and return the results as an array.

Run a function on a given set of partitions in an RDD and return the results as an array. The function that is run against each partition additionally takes TaskContext argument.

rdd: target RDD to run tasks on
func: a function to run on each partition of the RDD
partitions: set of partitions to run on; some jobs may not want to compute on all partitions of the target RDD, e.g. for operations like first()
returns: in-memory collection with a result of the job (each collection element will contain a result from one partition)

def runJob[T, U](rdd: RDD[T], func: (TaskContext, Iterator[T]) ⇒ U, partitions: Seq[Int], resultHandler: (Int, U) ⇒ Unit)(implicit arg0: ClassTag[U]): Unit

Run a function on a given set of partitions in an RDD and pass the results to the given handler function.

Run a function on a given set of partitions in an RDD and pass the results to the given handler function. This is the main entry point for all actions in Spark.

rdd: target RDD to run tasks on
func: a function to run on each partition of the RDD
partitions: set of partitions to run on; some jobs may not want to compute on all partitions of the target RDD, e.g. for operations like first()
resultHandler: callback to pass each result to

def sequenceFile[K, V](path: String, minPartitions: Int = defaultMinPartitions)(implicit km: ClassTag[K], vm: ClassTag[V], kcf: () ⇒ WritableConverter[K], vcf: () ⇒ WritableConverter[V]): RDD[(K, V)]

Version of sequenceFile() for types implicitly convertible to Writables through a WritableConverter.

Version of sequenceFile() for types implicitly convertible to Writables through a WritableConverter. For example, to access a SequenceFile where the keys are Text and the values are IntWritable, you could simply write

sparkContext.sequenceFile[String, Int](path, ...)

WritableConverters are provided in a somewhat strange way (by an implicit function) to support both subclasses of Writable and types for which we define a converter (e.g. Int to IntWritable). The most natural thing would've been to have implicit objects for the converters, but then we couldn't have an object for every subclass of Writable (you can't have a parameterized singleton object). We use functions instead to create a new converter for the appropriate type. In addition, we pass the converter a ClassTag of its type to allow it to figure out the Writable class to use in the subclass case.

path: directory to the input data files, the path can be comma separated paths as a list of inputs
minPartitions: suggested minimum number of partitions for the resulting RDD
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def sequenceFile[K, V](path: String, keyClass: Class[K], valueClass: Class[V]): RDD[(K, V)]

Get an RDD for a Hadoop SequenceFile with given key and value types.

path: directory to the input data files, the path can be comma separated paths as a list of inputs
keyClass: Class of the key associated with SequenceFileInputFormat
valueClass: Class of the value associated with SequenceFileInputFormat
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def sequenceFile[K, V](path: String, keyClass: Class[K], valueClass: Class[V], minPartitions: Int): RDD[(K, V)]

Get an RDD for a Hadoop SequenceFile with given key and value types.

path: directory to the input data files, the path can be comma separated paths as a list of inputs
keyClass: Class of the key associated with SequenceFileInputFormat
valueClass: Class of the value associated with SequenceFileInputFormat
minPartitions: suggested minimum number of partitions for the resulting RDD
returns: RDD of tuples of key and corresponding value

Note: Because Hadoop's RecordReader class re-uses the same Writable object for each record, directly caching the returned RDD or directly passing it to an aggregation or shuffle operation will create many references to the same object. If you plan to directly cache, sort, or aggregate Hadoop writable objects, you should first copy them using a map function.

def setCallSite(shortCallSite: String): Unit

Set the thread-local property for overriding the call sites of actions and RDDs.

def setCheckpointDir(directory: String): Unit

Set the directory under which RDDs are going to be checkpointed.

directory: path to the directory where checkpoint files will be stored (must be HDFS path if running in cluster)

def setJobDescription(value: String): Unit

Set a human readable description of the current job.

def setJobGroup(groupId: String, description: String, interruptOnCancel: Boolean = false): Unit

Assigns a group ID to all the jobs started by this thread until the group ID is set to a different value or cleared.

Often, a unit of execution in an application consists of multiple Spark actions or jobs. Application programmers can use this method to group all those jobs together and give a group description. Once set, the Spark web UI will associate such jobs with this group.

The application can also use org.apache.spark.SparkContext.cancelJobGroup to cancel all running jobs in this group. For example,

// In the main thread:
sc.setJobGroup("some_job_to_cancel", "some job description")
sc.parallelize(1 to 10000, 2).map { i => Thread.sleep(10); i }.count()

// In a separate thread:
sc.cancelJobGroup("some_job_to_cancel")

interruptOnCancel: If true, then job cancellation will result in Thread.interrupt() being called on the job's executor threads. This is useful to help ensure that the tasks are actually stopped in a timely manner, but is off by default due to HDFS-1208, where HDFS may respond to Thread.interrupt() by marking nodes as dead.

def setLocalProperty(key: String, value: String): Unit

Set a local property that affects jobs submitted from this thread, such as the Spark fair scheduler pool.

Set a local property that affects jobs submitted from this thread, such as the Spark fair scheduler pool. User-defined properties may also be set here. These properties are propagated through to worker tasks and can be accessed there via org.apache.spark.TaskContext#getLocalProperty.

These properties are inherited by child threads spawned from this thread. This may have unexpected consequences when working with thread pools. The standard java implementation of thread pools have worker threads spawn other worker threads. As a result, local properties may propagate unpredictably.

def setLogLevel(logLevel: String): Unit

Control our logLevel.

Control our logLevel. This overrides any user-defined log settings.

logLevel: The desired log level as a string. Valid log levels include: ALL, DEBUG, ERROR, FATAL, INFO, OFF, TRACE, WARN

val sparkUser: String

val startTime: Long

def statusTracker: SparkStatusTracker

def stop(): Unit

Shut down the SparkContext.

def submitJob[T, U, R](rdd: RDD[T], processPartition: (Iterator[T]) ⇒ U, partitions: Seq[Int], resultHandler: (Int, U) ⇒ Unit, resultFunc: ⇒ R): SimpleFutureAction[R]

Submit a job for execution and return a FutureJob holding the result.

rdd: target RDD to run tasks on
processPartition: a function to run on each partition of the RDD
partitions: set of partitions to run on; some jobs may not want to compute on all partitions of the target RDD, e.g. for operations like first()
resultHandler: callback to pass each result to
resultFunc: function to be executed when the result is ready

final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes: AnyRef

def textFile(path: String, minPartitions: Int = defaultMinPartitions): RDD[String]

Read a text file from HDFS, a local file system (available on all nodes), or any Hadoop-supported file system URI, and return it as an RDD of Strings.

path: path to the text file on a supported file system
minPartitions: suggested minimum number of partitions for the resulting RDD
returns: RDD of lines of the text file

def toString(): String

Definition Classes: AnyRef → Any

def uiWebUrl: Option[String]

def union[T](first: RDD[T], rest: RDD[T]*)(implicit arg0: ClassTag[T]): RDD[T]

Build the union of a list of RDDs passed as variable-length arguments.

def union[T](rdds: Seq[RDD[T]])(implicit arg0: ClassTag[T]): RDD[T]

Build the union of a list of RDDs.

def version: String

The version of Spark on which this application is running.

final def wait(): Unit

Definition Classes: AnyRef
Annotations: @throws( ... )

final def wait(arg0: Long, arg1: Int): Unit

Definition Classes: AnyRef
Annotations: @throws( ... )

final def wait(arg0: Long): Unit

Definition Classes: AnyRef
Annotations: @native() @throws( ... )

def wholeTextFiles(path: String, minPartitions: Int = defaultMinPartitions): RDD[(String, String)]

Read a directory of text files from HDFS, a local file system (available on all nodes), or any Hadoop-supported file system URI.

Read a directory of text files from HDFS, a local file system (available on all nodes), or any Hadoop-supported file system URI. Each file is read as a single record and returned in a key-value pair, where the key is the path of each file, the value is the content of each file.

For example, if you have the following files:

hdfs://a-hdfs-path/part-00000
hdfs://a-hdfs-path/part-00001
...
hdfs://a-hdfs-path/part-nnnnn

Do val rdd = sparkContext.wholeTextFile("hdfs://a-hdfs-path"),

then rdd contains

(a-hdfs-path/part-00000, its content)
(a-hdfs-path/part-00001, its content)
...
(a-hdfs-path/part-nnnnn, its content)

path: Directory to the input data files, the path can be comma separated paths as the list of inputs.
minPartitions: A suggestion value of the minimal splitting number for input data.
returns: RDD representing tuples of file path and the corresponding file content

Note: Small files are preferred, large file is also allowable, but may cause bad performance.
,
On some filesystems, .../path/* can be a more efficient way to read all files in a directory rather than .../path/ or .../path
,
Partitioning is determined by data locality. This may result in too few partitions by default.

Packages

SparkContext

Companion object SparkContext

class SparkContext extends Logging

Instance Constructors

Value Members

Inherited from Logging

Inherited from AnyRef

Inherited from Any

Ungrouped