Examples of org.apache.hadoop.io.DataInputBuffer

org.apache.hadoop.io.DataInputBuffer
A reusable {@link DataInput} implementation that reads from an in-memorybuffer.
This saves memory over creating a new DataInputStream and ByteArrayInputStream each time data is read.
Typical usage is something like the following:
```
 DataInputBuffer buffer = new DataInputBuffer(); while (... loop condition ...) { byte[] data = ... get data ...; int dataLength = ... get data length ...; buffer.reset(data, dataLength); ... read buffer using DataInput methods ... } 
```


        valTransferBuffer = new BytesWritable();
        // TODO: remember the longest key in a TFile, and use it to replace
        // MAX_KEY_SIZE.
        keyBuffer = new byte[MAX_KEY_SIZE];
        keyDataInputStream = new DataInputBuffer();
        valueBufferInputStream = new ChunkDecoder();
        valueDataInputStream = new DataInputStream(valueBufferInputStream);


        if (beginLocation.compareTo(endLocation) >= 0) {
          currentLocation = new Location(endLocation);

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     * read the next key 
     */
    private void readNextKey() throws IOException {
      more = in.next();
      if (more) {
        DataInputBuffer nextKeyBytes = in.getKey();
        keyIn.reset(nextKeyBytes.getData(), nextKeyBytes.getPosition(), nextKeyBytes.getLength());
        nextKey = keyDeserializer.deserialize(nextKey);
        hasNext = key != null && (comparator.compare(key, nextKey) == 0);
      } else {
        hasNext = false;
      }

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    /**
     * Read the next value
     * @throws IOException
     */
    private void readNextValue() throws IOException {
      DataInputBuffer nextValueBytes = in.getValue();
      valueIn.reset(nextValueBytes.getData(), nextValueBytes.getPosition(), nextValueBytes.getLength());
      value = valDeserializer.deserialize(value);
    }

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        return null;
    }
    @SuppressWarnings("unchecked")
    public PigSecondaryKeyComparator() {
        super(TupleFactory.getInstance().tupleClass());
        buffer = new DataInputBuffer();
        key1 = new NullableTuple();
        key2 = new NullableTuple();
    }

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      IOException wrap = new IOException("Split class " + splitClass + 
                                         " not found");
      wrap.initCause(exp);
      throw wrap;
    }
    DataInputBuffer splitBuffer = new DataInputBuffer();
    splitBuffer.reset(split.get(), 0, split.getSize());
    instantiatedSplit.readFields(splitBuffer);
    
    // if it is a file split, we can give more details
    if (instantiatedSplit instanceof FileSplit) {
      FileSplit fileSplit = (FileSplit) instantiatedSplit;

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        value = (Writable)ReflectionUtils.newInstance(valClass, job);
      } catch (Exception e) {
        throw new RuntimeException(e);
      }


      DataInputBuffer keyIn = new DataInputBuffer();
      DataInputBuffer valIn = new DataInputBuffer();
      DataOutputBuffer valOut = new DataOutputBuffer();
      while (resultIter.next()) {
        keyIn.reset(resultIter.getKey().getData(), 
                    resultIter.getKey().getLength());
        key.readFields(keyIn);
        valOut.reset();
        (resultIter.getValue()).writeUncompressedBytes(valOut);
        valIn.reset(valOut.getData(), valOut.getLength());
        value.readFields(valIn);
        writer.append(key, value);
        reporter.progress();
      }
    }

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        "bytes array");
    }
    if (w == null) {
      throw new IllegalArgumentException("Writable cannot be null");
    }
    DataInputBuffer in = new DataInputBuffer();
    try {
      in.reset(bytes, bytes.length);
      w.readFields(in);
      return w;
    } finally {
      in.close();
    }
  }

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        throws IOException {
      
      this.conf = conf;
      this.fs = fs;
      this.tableName = tableName;
      this.in = new DataInputBuffer();
      this.more = true;
      this.key = new HStoreKey();
      this.info = new HRegionInfo();
      this.dir = new Path(conf.get(HBASE_DIR, DEFAULT_HBASE_DIR));
      this.basedir = new Path(dir, "merge_" + System.currentTimeMillis());

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            long segmentStart = out.getPos();
            writer = new Writer<K, V>(job, out, keyClass, valClass, codec,
                                      spilledRecordsCounter);
            if (combinerRunner == null) {
              // spill directly
              DataInputBuffer key = new DataInputBuffer();
              while (spindex < endPosition &&
                  kvindices[kvoffsets[spindex % kvoffsets.length]
                            + PARTITION] == i) {
                final int kvoff = kvoffsets[spindex % kvoffsets.length];
                getVBytesForOffset(kvoff, value);
                key.reset(kvbuffer, kvindices[kvoff + KEYSTART],
                          (kvindices[kvoff + VALSTART] - 
                           kvindices[kvoff + KEYSTART]));
                writer.append(key, value);
                ++spindex;
              }

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      r = new SequenceFile.Reader(fs, f.getPath(), getConf());
      key = ReflectionUtils.newInstance(r.getKeyClass().asSubclass(WritableComparable.class),
                                        getConf());
      val = ReflectionUtils.newInstance(r.getValueClass().asSubclass(Writable.class),
                                        getConf());
      inbuf = new DataInputBuffer();
      outbuf = new DataOutputBuffer();
    }

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