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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.hadoop.mapreduce
import org.apache.hadoop.conf.Configuration
import java.lang.{Integer => JInteger, Boolean => JBoolean}
trait SparkHadoopMapReduceUtil {
def newJobContext(conf: Configuration, jobId: JobID): JobContext = {
val klass = firstAvailableClass(
"org.apache.hadoop.mapreduce.task.JobContextImpl", // hadoop2, hadoop2-yarn
"org.apache.hadoop.mapreduce.JobContext") // hadoop1
val ctor = klass.getDeclaredConstructor(classOf[Configuration], classOf[JobID])
ctor.newInstance(conf, jobId).asInstanceOf[JobContext]
}
def newTaskAttemptContext(conf: Configuration, attemptId: TaskAttemptID): TaskAttemptContext = {
val klass = firstAvailableClass(
"org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl", // hadoop2, hadoop2-yarn
"org.apache.hadoop.mapreduce.TaskAttemptContext") // hadoop1
val ctor = klass.getDeclaredConstructor(classOf[Configuration], classOf[TaskAttemptID])
ctor.newInstance(conf, attemptId).asInstanceOf[TaskAttemptContext]
}
def newTaskAttemptID(jtIdentifier: String, jobId: Int, isMap: Boolean, taskId: Int, attemptId: Int) = {
val klass = Class.forName("org.apache.hadoop.mapreduce.TaskAttemptID");
try {
// first, attempt to use the old-style constructor that takes a boolean isMap (not available in YARN)
val ctor = klass.getDeclaredConstructor(classOf[String], classOf[Int], classOf[Boolean],
classOf[Int], classOf[Int])
ctor.newInstance(jtIdentifier, new JInteger(jobId), new JBoolean(isMap), new JInteger(taskId), new
JInteger(attemptId)).asInstanceOf[TaskAttemptID]
} catch {
case exc: NoSuchMethodException => {
// failed, look for the new ctor that takes a TaskType (not available in 1.x)
val taskTypeClass = Class.forName("org.apache.hadoop.mapreduce.TaskType").asInstanceOf[Class[Enum[_]]]
val taskType = taskTypeClass.getMethod("valueOf", classOf[String]).invoke(taskTypeClass, if(isMap) "MAP" else "REDUCE")
val ctor = klass.getDeclaredConstructor(classOf[String], classOf[Int], taskTypeClass,
classOf[Int], classOf[Int])
ctor.newInstance(jtIdentifier, new JInteger(jobId), taskType, new JInteger(taskId), new
JInteger(attemptId)).asInstanceOf[TaskAttemptID]
}
}
}
private def firstAvailableClass(first: String, second: String): Class[_] = {
try {
Class.forName(first)
} catch {
case e: ClassNotFoundException =>
Class.forName(second)
}
}
}
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