Eksportowanie danych z Mongo/Cassandra do HDFS za pomocą Apache Sqoop

Skorzystałem z przykładu z sieci i mogę przesyłać pliki z Mongo do HDFS i na odwrót. W tej chwili nie mogłem zebrać dokładnej strony internetowej. Ale program wygląda jak poniżej.

Możesz wydobyć z tego iskrę i iść dalej.

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.bson.BSONObject;
import org.bson.types.ObjectId;

import com.mongodb.hadoop.MongoInputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;

import com.mongodb.hadoop.util.MongoConfigUtil;

public class CopyFromMongodbToHDFS {

    public static class ImportWeblogsFromMongo extends
            Mapper<LongWritable, Text, Text, Text> {

        public void map(Object key, BSONObject value, Context context)
                throws IOException, InterruptedException {

            System.out.println("Key: " + key);
            System.out.println("Value: " + value);
            String md5 = value.get("md5").toString();
            String url = value.get("url").toString();
            String date = value.get("date").toString();
            String time = value.get("time").toString();
            String ip = value.get("ip").toString();
            String output = "\t" + url + "\t" + date + "\t" + time + "\t" + ip;
            context.write(new Text(md5), new Text(output));

        }

    }

    public static void main(String[] args) throws IOException,
            InterruptedException, ClassNotFoundException {

        Configuration conf = new Configuration();
        MongoConfigUtil.setInputURI(conf,
                "mongodb://127.0.0.1:27017/test.mylogs");

        System.out.println("Configuration: " + conf);

        @SuppressWarnings("deprecation")
        Job job = new Job(conf, "Mongo Import");

        Path out = new Path("/user/cloudera/test1/logs.txt");

        FileOutputFormat.setOutputPath(job, out);

        job.setJarByClass(CopyFromMongodbToHDFS.class);
        job.setMapperClass(ImportWeblogsFromMongo.class);

        job.setOutputKeyClass(ObjectId.class);
        job.setOutputValueClass(BSONObject.class);

        job.setInputFormatClass(MongoInputFormat.class);
        job.setOutputFormatClass(TextOutputFormat.class);

        job.setNumReduceTasks(0);
        System.exit(job.waitForCompletion(true) ? 0 : 1);

    }

}