/*
 * 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.hadoop;

import java.util.Collection;
import org.apache.ignite.IgniteCheckedException;
import org.apache.ignite.cluster.ClusterNode;
import org.jetbrains.annotations.Nullable;

/**
 * Map-reduce execution planner.
 */
public interface HadoopMapReducePlanner {
    /**
     * Prepares map-reduce execution plan for the given job and topology.
     *
     * @param job Job.
     * @param top Topology.
     * @param oldPlan Old plan in case of partial failure.
     * @return Map reduce plan.
     * @throws IgniteCheckedException If an error occurs.
     */
    public HadoopMapReducePlan preparePlan(HadoopJob job, Collection<ClusterNode> top,
        @Nullable HadoopMapReducePlan oldPlan) throws IgniteCheckedException;
}