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The MongoDB Connector for Hadoop is a plugin for Hadoop that provides the ability to use MongoDB as an input source and/or an output destination.

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/*
 * Copyright 2010-2013 10gen Inc.
 *
 * Licensed 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.mongodb.hadoop;

import com.mongodb.hadoop.output.MongoOutputCommitter;
import com.mongodb.hadoop.output.MongoRecordWriter;
import com.mongodb.hadoop.util.MongoConfigUtil;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

import java.io.IOException;

public class MongoOutputFormat extends OutputFormat {
    private final String[] updateKeys;
    private final boolean multiUpdate;

    public void checkOutputSpecs(final JobContext context) throws IOException {
        if (MongoConfigUtil.getOutputURIs(context.getConfiguration()).isEmpty()) {
            throw new IOException("No output URI is specified. You must set mongo.output.uri.");
        }
    }

    public OutputCommitter getOutputCommitter(final TaskAttemptContext context) {
        return new MongoOutputCommitter();
    }

    /**
     * Get the record writer that points to the output collection.
     */
    public RecordWriter getRecordWriter(final TaskAttemptContext context) {
        return new MongoRecordWriter(MongoConfigUtil.getOutputCollections(context.getConfiguration()), context);
    }

    public MongoOutputFormat() {
        multiUpdate = false;
        updateKeys = null;
    }

    public MongoOutputFormat(final String[] updateKeys, final boolean multiUpdate) {
        this.updateKeys = updateKeys;
        this.multiUpdate = multiUpdate;
    }
}