com.cloudera.crunch.impl.mr.run.CrunchInputs.java Source code

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Here is the source code for com.cloudera.crunch.impl.mr.run.CrunchInputs.java

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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 com.cloudera.crunch.impl.mr.run;

import java.util.List;
import java.util.Map;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;

import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

public class CrunchInputs {

    private static final char RECORD_SEP = ',';
    private static final char FIELD_SEP = ';';
    private static final Joiner JOINER = Joiner.on(FIELD_SEP);
    private static final Splitter SPLITTER = Splitter.on(FIELD_SEP);

    public static void addInputPath(Job job, Path path, Class<? extends InputFormat> inputFormatClass,
            int nodeIndex) {
        Configuration conf = job.getConfiguration();
        String inputs = JOINER.join(inputFormatClass.getName(), nodeIndex, path.toString());
        String existing = conf.get(RuntimeParameters.MULTI_INPUTS);
        conf.set(RuntimeParameters.MULTI_INPUTS, existing == null ? inputs : existing + RECORD_SEP + inputs);
    }

    public static Map<Class<? extends InputFormat>, Map<Integer, List<Path>>> getFormatNodeMap(JobContext job) {
        Map<Class<? extends InputFormat>, Map<Integer, List<Path>>> formatNodeMap = Maps.newHashMap();
        Configuration conf = job.getConfiguration();
        for (String input : Splitter.on(RECORD_SEP).split(conf.get(RuntimeParameters.MULTI_INPUTS))) {
            List<String> fields = ImmutableList.copyOf(SPLITTER.split(input));
            Class<? extends InputFormat> inputFormatClass;
            try {
                inputFormatClass = (Class<? extends InputFormat>) conf.getClassByName(fields.get(0));
            } catch (ClassNotFoundException e) {
                throw new RuntimeException(e);
            }
            if (!formatNodeMap.containsKey(inputFormatClass)) {
                formatNodeMap.put(inputFormatClass, Maps.<Integer, List<Path>>newHashMap());
            }
            Integer nodeIndex = Integer.valueOf(fields.get(1));
            if (!formatNodeMap.get(inputFormatClass).containsKey(nodeIndex)) {
                formatNodeMap.get(inputFormatClass).put(nodeIndex, Lists.<Path>newLinkedList());
            }
            formatNodeMap.get(inputFormatClass).get(nodeIndex).add(new Path(fields.get(2)));
        }
        return formatNodeMap;
    }

}