spark ShuffleDataIOUtils 源码
spark ShuffleDataIOUtils 代码
文件路径：/core/src/main/scala/org/apache/spark/shuffle/ShuffleDataIOUtils.scala
/*
* 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.shuffle
import org.apache.spark.SparkConf
import org.apache.spark.internal.config.SHUFFLE_IO_PLUGIN_CLASS
import org.apache.spark.shuffle.api.ShuffleDataIO
import org.apache.spark.util.Utils
private[spark] object ShuffleDataIOUtils {
/**
* The prefix of spark config keys that are passed from the driver to the executor.
*/
val SHUFFLE_SPARK_CONF_PREFIX = "spark.shuffle.plugin.__config__."
def loadShuffleDataIO(conf: SparkConf): ShuffleDataIO = {
val configuredPluginClass = conf.get(SHUFFLE_IO_PLUGIN_CLASS)
val maybeIO = Utils.loadExtensions(
classOf[ShuffleDataIO], Seq(configuredPluginClass), conf)
require(maybeIO.nonEmpty, s"A valid shuffle plugin must be specified by config " +
s"${SHUFFLE_IO_PLUGIN_CLASS.key}, but $configuredPluginClass resulted in zero valid " +
s"plugins.")
maybeIO.head
}
}
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