com.mongodb.spark.rdd.partitioner.MongoSinglePartitioner.scala Maven / Gradle / Ivy
/*
* Copyright 2016 MongoDB, Inc.
*
* Licensed 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.
*/
package com.mongodb.spark.rdd.partitioner
import org.bson.{BsonDocument, BsonValue}
import com.mongodb.spark.MongoConnector
import com.mongodb.spark.config.ReadConfig
/**
* The Single Partitioner.
*
* Creates a single partition for the whole collection.
*
* '''Note:''' Using this partitioner loses any parallelism and therefore is not generally recommended.
*
* @since 1.0
*/
class MongoSinglePartitioner extends MongoPartitioner {
override def partitions(connector: MongoConnector, readConfig: ReadConfig,
pipeline: Array[BsonDocument] = Array.empty[BsonDocument]): Array[MongoPartition] = {
PartitionerHelper.createPartitions("_id", Seq.empty[BsonValue], PartitionerHelper.locations(connector), addMinMax = false)
}
}
case object MongoSinglePartitioner extends MongoSinglePartitioner