/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Core Spark functionality. [[spark.SparkContext]] serves as the main entry point to Spark, while
 * [[spark.RDD]] is the data type representing a distributed collection, and provides most
 * parallel operations. 
 *
 * In addition, [[spark.PairRDDFunctions]] contains operations available only on RDDs of key-value
 * pairs, such as `groupByKey` and `join`; [[spark.DoubleRDDFunctions]] contains operations
 * available only on RDDs of Doubles; and [[spark.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 when
 * you `import spark.SparkContext._`.
 */
package object spark { 
  // For package docs only
}