Examples with Writable org.apache.hadoop.io.Writable used on opensource projects

Example 31 with Writable

use of org.apache.hadoop.io.Writable in project hadoop by apache.

the class NativeSerialization method getSerializer.

@SuppressWarnings("unchecked")
public INativeSerializer<Writable> getSerializer(Class<?> c) throws IOException {
    if (null == c) {
        return null;
    }
    if (!Writable.class.isAssignableFrom(c)) {
        throw new IOException("Cannot serialize type " + c.getName() + ", we only accept subclass of Writable");
    }
    final String name = c.getName();
    final Class<?> serializer = map.get(name);
    if (null != serializer) {
        try {
            return (INativeSerializer<Writable>) serializer.newInstance();
        } catch (final Exception e) {
            throw new IOException(e);
        }
    }
    return new DefaultSerializer();
}

Example 32 with Writable

use of org.apache.hadoop.io.Writable in project hadoop by apache.

the class Join method run.

/**
   * The main driver for sort program.
   * Invoke this method to submit the map/reduce job.
   * @throws IOException When there is communication problems with the 
   *                     job tracker.
   */
@SuppressWarnings("unchecked")
public int run(String[] args) throws Exception {
    Configuration conf = getConf();
    JobClient client = new JobClient(conf);
    ClusterStatus cluster = client.getClusterStatus();
    int num_reduces = (int) (cluster.getMaxReduceTasks() * 0.9);
    String join_reduces = conf.get(REDUCES_PER_HOST);
    if (join_reduces != null) {
        num_reduces = cluster.getTaskTrackers() * Integer.parseInt(join_reduces);
    }
    Job job = Job.getInstance(conf);
    job.setJobName("join");
    job.setJarByClass(Sort.class);
    job.setMapperClass(Mapper.class);
    job.setReducerClass(Reducer.class);
    Class<? extends InputFormat> inputFormatClass = SequenceFileInputFormat.class;
    Class<? extends OutputFormat> outputFormatClass = SequenceFileOutputFormat.class;
    Class<? extends WritableComparable> outputKeyClass = BytesWritable.class;
    Class<? extends Writable> outputValueClass = TupleWritable.class;
    String op = "inner";
    List<String> otherArgs = new ArrayList<String>();
    for (int i = 0; i < args.length; ++i) {
        try {
            if ("-r".equals(args[i])) {
                num_reduces = Integer.parseInt(args[++i]);
            } else if ("-inFormat".equals(args[i])) {
                inputFormatClass = Class.forName(args[++i]).asSubclass(InputFormat.class);
            } else if ("-outFormat".equals(args[i])) {
                outputFormatClass = Class.forName(args[++i]).asSubclass(OutputFormat.class);
            } else if ("-outKey".equals(args[i])) {
                outputKeyClass = Class.forName(args[++i]).asSubclass(WritableComparable.class);
            } else if ("-outValue".equals(args[i])) {
                outputValueClass = Class.forName(args[++i]).asSubclass(Writable.class);
            } else if ("-joinOp".equals(args[i])) {
                op = args[++i];
            } else {
                otherArgs.add(args[i]);
            }
        } catch (NumberFormatException except) {
            System.out.println("ERROR: Integer expected instead of " + args[i]);
            return printUsage();
        } catch (ArrayIndexOutOfBoundsException except) {
            System.out.println("ERROR: Required parameter missing from " + args[i - 1]);
            // exits
            return printUsage();
        }
    }
    // Set user-supplied (possibly default) job configs
    job.setNumReduceTasks(num_reduces);
    if (otherArgs.size() < 2) {
        System.out.println("ERROR: Wrong number of parameters: ");
        return printUsage();
    }
    FileOutputFormat.setOutputPath(job, new Path(otherArgs.remove(otherArgs.size() - 1)));
    List<Path> plist = new ArrayList<Path>(otherArgs.size());
    for (String s : otherArgs) {
        plist.add(new Path(s));
    }
    job.setInputFormatClass(CompositeInputFormat.class);
    job.getConfiguration().set(CompositeInputFormat.JOIN_EXPR, CompositeInputFormat.compose(op, inputFormatClass, plist.toArray(new Path[0])));
    job.setOutputFormatClass(outputFormatClass);
    job.setOutputKeyClass(outputKeyClass);
    job.setOutputValueClass(outputValueClass);
    Date startTime = new Date();
    System.out.println("Job started: " + startTime);
    int ret = job.waitForCompletion(true) ? 0 : 1;
    Date end_time = new Date();
    System.out.println("Job ended: " + end_time);
    System.out.println("The job took " + (end_time.getTime() - startTime.getTime()) / 1000 + " seconds.");
    return ret;
}

Example 33 with Writable

use of org.apache.hadoop.io.Writable in project hadoop by apache.

the class BytesFactory method newObject.

public static Writable newObject(byte[] seed, String className) {
    Writable ret;
    try {
        Class<?> clazz = Class.forName(className);
        Preconditions.checkArgument(Writable.class.isAssignableFrom(clazz));
        ret = (Writable) clazz.newInstance();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    if (seed != null) {
        updateObject(ret, seed);
    }
    return ret;
}

Example 34 with Writable

use of org.apache.hadoop.io.Writable in project hive by apache.

the class TestAbstractParquetMapInspector method testHashMap.

@Test
public void testHashMap() {
    final Map<Writable, Writable> map = new HashMap<Writable, Writable>();
    map.put(new IntWritable(0), new IntWritable(1));
    map.put(new IntWritable(2), new IntWritable(3));
    map.put(new IntWritable(4), new IntWritable(5));
    map.put(new IntWritable(6), new IntWritable(7));
    assertEquals("Wrong size", 4, inspector.getMapSize(map));
    assertEquals("Wrong result of inspection", map, inspector.getMap(map));
}

Example 35 with Writable

use of org.apache.hadoop.io.Writable in project hive by apache.

the class TestDeepParquetHiveMapInspector method testRegularMap.

@Test
public void testRegularMap() {
    final Writable[] entry1 = new Writable[] { new IntWritable(0), new IntWritable(1) };
    final Writable[] entry2 = new Writable[] { new IntWritable(2), new IntWritable(3) };
    final ArrayWritable map = new ArrayWritable(ArrayWritable.class, new Writable[] { new ArrayWritable(Writable.class, entry1), new ArrayWritable(Writable.class, entry2) });
    assertEquals("Wrong result of inspection", new IntWritable(1), inspector.getMapValueElement(map, new IntWritable(0)));
    assertEquals("Wrong result of inspection", new IntWritable(3), inspector.getMapValueElement(map, new IntWritable(2)));
    assertEquals("Wrong result of inspection", new IntWritable(1), inspector.getMapValueElement(map, new ShortWritable((short) 0)));
    assertEquals("Wrong result of inspection", new IntWritable(3), inspector.getMapValueElement(map, new ShortWritable((short) 2)));
}