/**
* 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.hive.ql.exec.spark;
import org.apache.hadoop.hive.ql.io.HiveKey;
import org.apache.hadoop.io.BytesWritable;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.storage.StorageLevel;
public class ShuffleTran implements SparkTran<HiveKey, BytesWritable, HiveKey, BytesWritable> {
private final SparkShuffler shuffler;
private final int numOfPartitions;
private final boolean toCache;
private final SparkPlan sparkPlan;
private String name = "Shuffle";
public ShuffleTran(SparkPlan sparkPlan, SparkShuffler sf, int n) {
this(sparkPlan, sf, n, false);
}
public ShuffleTran(SparkPlan sparkPlan, SparkShuffler sf, int n, boolean toCache) {
shuffler = sf;
numOfPartitions = n;
this.toCache = toCache;
this.sparkPlan = sparkPlan;
}
@Override
public JavaPairRDD<HiveKey, BytesWritable> transform(JavaPairRDD<HiveKey, BytesWritable> input) {
JavaPairRDD<HiveKey, BytesWritable> result = shuffler.shuffle(input, numOfPartitions);
if (toCache) {
sparkPlan.addCachedRDDId(result.id());
result = result.persist(StorageLevel.MEMORY_AND_DISK());
}
return result;
}
public int getNoOfPartitions() {
return numOfPartitions;
}
@Override
public String getName() {
return name;
}
@Override
public Boolean isCacheEnable() {
return new Boolean(toCache);
}
@Override
public void setName(String name) {
this.name = name;
}
public SparkShuffler getShuffler() {
return shuffler;
}
}