/*
* 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.ignite.internal.processors.hadoop.planner;
import org.apache.ignite.hadoop.HadoopInputSplit;
import org.apache.ignite.hadoop.HadoopMapReducePlan;
import org.jetbrains.annotations.Nullable;
import java.util.Collection;
import java.util.Map;
import java.util.UUID;
/**
* Map-reduce plan.
*/
public class HadoopDefaultMapReducePlan implements HadoopMapReducePlan {
/** */
private static final long serialVersionUID = 0L;
/** Mappers map. */
private Map<UUID, Collection<HadoopInputSplit>> mappers;
/** Reducers map. */
private Map<UUID, int[]> reducers;
/** Mappers count. */
private int mappersCnt;
/** Reducers count. */
private int reducersCnt;
/**
* @param mappers Mappers map.
* @param reducers Reducers map.
*/
public HadoopDefaultMapReducePlan(Map<UUID, Collection<HadoopInputSplit>> mappers,
Map<UUID, int[]> reducers) {
this.mappers = mappers;
this.reducers = reducers;
if (mappers != null) {
for (Collection<HadoopInputSplit> splits : mappers.values())
mappersCnt += splits.size();
}
if (reducers != null) {
for (int[] rdcrs : reducers.values())
reducersCnt += rdcrs.length;
}
}
/** {@inheritDoc} */
@Override public int mappers() {
return mappersCnt;
}
/** {@inheritDoc} */
@Override public int reducers() {
return reducersCnt;
}
/** {@inheritDoc} */
@Override public UUID nodeForReducer(int reducer) {
assert reducer >= 0 && reducer < reducersCnt : reducer;
for (Map.Entry<UUID, int[]> entry : reducers.entrySet()) {
for (int r : entry.getValue()) {
if (r == reducer)
return entry.getKey();
}
}
throw new IllegalStateException("Not found reducer index: " + reducer);
}
/** {@inheritDoc} */
@Override @Nullable public Collection<HadoopInputSplit> mappers(UUID nodeId) {
return mappers.get(nodeId);
}
/** {@inheritDoc} */
@Override @Nullable public int[] reducers(UUID nodeId) {
return reducers.get(nodeId);
}
/** {@inheritDoc} */
@Override public Collection<UUID> mapperNodeIds() {
return mappers.keySet();
}
/** {@inheritDoc} */
@Override public Collection<UUID> reducerNodeIds() {
return reducers.keySet();
}
}