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/*
* 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.
*/
package org.apache.spark.api.python
import java.util.Arrays
import org.apache.spark.Partitioner
import org.apache.spark.util.Utils
/**
* A [[org.apache.spark.Partitioner]] that performs handling of long-valued keys, for use by the Python API.
*
* Stores the unique id() of the Python-side partitioning function so that it is incorporated into
* equality comparisons. Correctness requires that the id is a unique identifier for the
* lifetime of the program (i.e. that it is not re-used as the id of a different partitioning
* function). This can be ensured by using the Python id() function and maintaining a reference
* to the Python partitioning function so that its id() is not reused.
*/
private[spark] class PythonPartitioner(
override val numPartitions: Int,
val pyPartitionFunctionId: Long)
extends Partitioner {
override def getPartition(key: Any): Int = key match {
case null => 0
// we don't trust the Python partition function to return valid partition ID's so
// let's do a modulo numPartitions in any case
case key: Long => Utils.nonNegativeMod(key.toInt, numPartitions)
case _ => Utils.nonNegativeMod(key.hashCode(), numPartitions)
}
override def equals(other: Any): Boolean = other match {
case h: PythonPartitioner =>
h.numPartitions == numPartitions && h.pyPartitionFunctionId == pyPartitionFunctionId
case _ =>
false
}
}
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