Examples of org.apache.hadoop.mapreduce.InputFormat

org.apache.hadoop.mapreduce.InputFormat
InputFormat describes the input-specification for a Map-Reduce job.
The Map-Reduce framework relies on the InputFormat of the job to:
1. Validate the input-specification of the job.
2. Split-up the input file(s) into logical {@link InputSplit}s, each of which is then assigned to an individual {@link Mapper}.
3. Provide the {@link RecordReader} implementation to be used to gleaninput records from the logical InputSplit for processing by the {@link Mapper}.
The default behavior of file-based {@link InputFormat}s, typically sub-classes of {@link FileInputFormat}, is to split the input into logical {@link InputSplit}s based on the total size, in bytes, of the input files. However, the {@link FileSystem} blocksize of the input files is treated as an upper bound for input splits. A lower bound on the split size can be set via mapred.min.split.size.

Clearly, logical splits based on input-size is insufficient for many applications since record boundaries are to respected. In such cases, the application has to also implement a {@link RecordReader} on whom lies theresponsibility to respect record-boundaries and present a record-oriented view of the logical InputSplit to the individual task. @see InputSplit @see RecordReader @see FileInputFormat

    conf1.set(DUMMY_KEY, "STATE1");
    TaskAttemptContext context1 = new TaskAttemptContext(conf1, taskId);


    // This will create a CombineFileRecordReader that itself contains a
    // DummyRecordReader.
    InputFormat inputFormat = new ChildRRInputFormat();


    Path [] files = { new Path("file1") };
    long [] lengths = { 1 };


    CombineFileSplit split = new CombineFileSplit(files, lengths);


    RecordReader rr = inputFormat.createRecordReader(split, context1);
    assertTrue("Unexpected RR type!", rr instanceof CombineFileRecordReader);


    // Verify that the initial configuration is the one being used.
    // Right after construction the dummy key should have value "STATE1"
    assertEquals("Invalid initial dummy key value", "STATE1",

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    Configuration conf = new Configuration();
    TaskAttemptContext context = new TaskAttemptContext(conf, taskId);


    // This will create a CombineFileRecordReader that itself contains a
    // DummyRecordReader.
    InputFormat inputFormat = new ChildRRInputFormat();


    Path [] files = { new Path("file1"), new Path("file2") };
    long [] lengths = { 1, 1 };


    CombineFileSplit split = new CombineFileSplit(files, lengths);
    RecordReader rr = inputFormat.createRecordReader(split, context);
    assertTrue("Unexpected RR type!", rr instanceof CombineFileRecordReader);


    // first initialize() call comes from MapTask. We'll do it here.
    rr.initialize(split, context);

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   */
  @SuppressWarnings("unchecked") // getInputFormat, getOutputKeyComparator
  public static <K,V> void writePartitionFile(Job job, Sampler<K,V> sampler)
      throws IOException, ClassNotFoundException, InterruptedException {
    Configuration conf = job.getConfiguration();
    final InputFormat inf =
        ReflectionUtils.newInstance(job.getInputFormatClass(), conf);
    int numPartitions = job.getNumReduceTasks();
    K[] samples = sampler.getSample(inf, job);
    LOG.info("Using " + samples.length + " samples");
    RawComparator<K> comparator =

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                            LoadFunc loader = (LoadFunc) PigContext
                            .instantiateFuncFromSpec(ld.getLFile()
                                    .getFuncSpec());
                            Job job = new Job(conf);
                            loader.setLocation(location, job);
                            InputFormat inf = loader.getInputFormat();
                            List<InputSplit> splits = inf.getSplits(new JobContext(
                                    job.getConfiguration(), job.getJobID()));
                            List<List<InputSplit>> results = MapRedUtil
                            .getCombinePigSplits(splits, fs
                                    .getDefaultBlockSize(), conf);
                            numFiles += results.size();

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        PigInputFormat.mergeSplitSpecificConf(loadFunc, pigSplit, conf);
        
        // for backward compatibility
        PigInputFormat.sJob = conf;
        
        InputFormat inputFormat = loadFunc.getInputFormat();
        
        return new PigRecordReader(inputFormat, pigSplit, loadFunc, context);
    }

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                        inputSpecificJob);
                // The above setLocation call could write to the conf within
                // the inputSpecificJob - use this updated conf
                
                // get the InputFormat from it and ask for splits
                InputFormat inpFormat = loadFunc.getInputFormat();
                List<InputSplit> oneInputSplits = inpFormat.getSplits(
                        new JobContext(inputSpecificJob.getConfiguration(), 
                                jobcontext.getJobID()));
                List<InputSplit> oneInputPigSplits = getPigSplits(
                        oneInputSplits, i, inpTargets.get(i), fs.getDefaultBlockSize(), combinable, confClone);
                splits.addAll(oneInputPigSplits);

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      //Pass all required information to the storage driver
      initStorageDriver(storageDriver, localJob, partitionInfo, jobInfo.getTableSchema());


      //Get the input format for the storage driver
      InputFormat inputFormat =
        storageDriver.getInputFormat(partitionInfo.getInputStorageDriverProperties());


      //Call getSplit on the storage drivers InputFormat, create an
      //HowlSplit for each underlying split
      List<InputSplit> baseSplits = inputFormat.getSplits(localJob);


      for(InputSplit split : baseSplits) {
        splits.add(new HowlSplit(
            partitionInfo,
            split,

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    //Pass all required information to the storage driver
    initStorageDriver(storageDriver, taskContext, partitionInfo, howlSplit.getTableSchema());


    //Get the input format for the storage driver
    InputFormat inputFormat =
      storageDriver.getInputFormat(partitionInfo.getInputStorageDriverProperties());


    //Create the underlying input formats record record and an Howl wrapper
    RecordReader recordReader =
      inputFormat.createRecordReader(howlSplit.getBaseSplit(), taskContext);


    return new HowlRecordReader(storageDriver,recordReader);
  }

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        PigInputFormat.mergeSplitSpecificConf(loadFunc, pigSplit, conf);
        
        // for backward compatibility
        PigInputFormat.sJob = conf;
        
        InputFormat inputFormat = loadFunc.getInputFormat();
        // now invoke the createRecordReader() with this "adjusted" conf
        RecordReader reader = inputFormat.createRecordReader(
                pigSplit.getWrappedSplit(), context);
        
        return new PigRecordReader(reader, loadFunc, conf);
    }

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                        inputSpecificJob);
                // The above setLocation call could write to the conf within
                // the inputSpecificJob - use this updated conf
                
                // get the InputFormat from it and ask for splits
                InputFormat inpFormat = loadFunc.getInputFormat();
                List<InputSplit> oneInputSplits = inpFormat.getSplits(
                        new JobContext(inputSpecificJob.getConfiguration(), 
                                jobcontext.getJobID()));
                List<PigSplit> oneInputPigSplits = getPigSplits(
                        oneInputSplits, i, inpTargets.get(i), conf);
                splits.addAll(oneInputPigSplits);

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