com.mongodb.hadoop.MongoOutputFormat Java Examples

The following examples show how to use com.mongodb.hadoop.MongoOutputFormat. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: MongoExtractor.java    From deep-spark with Apache License 2.0 4 votes vote down vote up 
/**
 * Instantiates a new Mongo extractor.
 */
public MongoExtractor() {
    super();
    this.inputFormat = new MongoInputFormat();
    this.outputFormat = new MongoOutputFormat();
}
Example #2
Source File: MapReduceExercise.java    From mongodb-hadoop-workshop with Apache License 2.0 4 votes vote down vote up 
public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException {
    if(args.length < 3) {
        System.err.println("Usage: MapReduceExercise " +
            "[mongodb input uri] " +
            "[mongodb output uri] " +
            "update=[true or false]");

        System.err.println("Example: MapReduceExercise " +
            "mongodb://127.0.0.1:27017/movielens.ratings " +
            "mongodb://127.0.0.1:27017/movielens.ratings.stats update=false");

        System.err.println("Example: MapReduceExercise " +
            "mongodb://127.0.0.1:27017/movielens.ratings " +
            "mongodb://127.0.0.1:27017/movielens.movies update=true");

        System.exit(-1);
    }

    Class outputValueClass = BSONWritable.class;
    Class reducerClass = Reduce.class;

    if(args[2].equals("update=true")) {
        outputValueClass = MongoUpdateWritable.class;
        reducerClass = ReduceUpdater.class;
    }

    Configuration conf = new Configuration();

    // Set MongoDB-specific configuration items
    conf.setClass("mongo.job.mapper", Map.class, Mapper.class);
    conf.setClass("mongo.job.reducer", reducerClass, Reducer.class);

    conf.setClass("mongo.job.mapper.output.key", IntWritable.class, Object.class);
    conf.setClass("mongo.job.mapper.output.value", DoubleWritable.class, Object.class);

    conf.setClass("mongo.job.output.key", NullWritable.class, Object.class);
    conf.setClass("mongo.job.output.value", outputValueClass, Object.class);

    conf.set("mongo.input.uri",  args[0]);
    conf.set("mongo.output.uri", args[1]);

    Job job = Job.getInstance(conf);

    // Set Hadoop-specific job parameters
    job.setInputFormatClass(MongoInputFormat.class);
    job.setOutputFormatClass(MongoOutputFormat.class);

    job.setMapOutputKeyClass(IntWritable.class);
    job.setMapOutputValueClass(DoubleWritable.class);

    job.setOutputKeyClass(NullWritable.class);
    job.setOutputValueClass(outputValueClass);

    job.setMapperClass(Map.class);
    job.setReducerClass(reducerClass);

    job.setJarByClass(MapReduceExercise.class);

    job.submit();
}