Java KeyValue.getKeyLength方法代碼示例

import org.apache.hadoop.hbase.KeyValue; //導入方法依賴的package包/類
/**
 * Check statistics for given HFile for different data block encoders.
 * @param scanner Of file which will be compressed.
 * @param kvLimit Maximal count of KeyValue which will be processed.
 * @throws IOException thrown if scanner is invalid
 */
public void checkStatistics(final KeyValueScanner scanner, final int kvLimit)
    throws IOException {
  scanner.seek(KeyValue.LOWESTKEY);

  KeyValue currentKV;

  byte[] previousKey = null;
  byte[] currentKey;

  DataBlockEncoding[] encodings = DataBlockEncoding.values();

  ByteArrayOutputStream uncompressedOutputStream =
      new ByteArrayOutputStream();

  int j = 0;
  while ((currentKV = KeyValueUtil.ensureKeyValue(scanner.next())) != null && j < kvLimit) {
    // Iterates through key/value pairs
    j++;
    currentKey = currentKV.getKey();
    if (previousKey != null) {
      for (int i = 0; i < previousKey.length && i < currentKey.length &&
          previousKey[i] == currentKey[i]; ++i) {
        totalKeyRedundancyLength++;
      }
    }

    uncompressedOutputStream.write(currentKV.getBuffer(),
        currentKV.getOffset(), currentKV.getLength());

    previousKey = currentKey;

    int kLen = currentKV.getKeyLength();
    int vLen = currentKV.getValueLength();
    int cfLen = currentKV.getFamilyLength(currentKV.getFamilyOffset());
    int restLen = currentKV.getLength() - kLen - vLen;

    totalKeyLength += kLen;
    totalValueLength += vLen;
    totalPrefixLength += restLen;
    totalCFLength += cfLen;
  }

  rawKVs = uncompressedOutputStream.toByteArray();
  boolean useTag = (currentKV.getTagsLength() > 0);
  for (DataBlockEncoding encoding : encodings) {
    if (encoding == DataBlockEncoding.NONE) {
      continue;
    }
    DataBlockEncoder d = encoding.getEncoder();
    HFileContext meta = new HFileContextBuilder()
                        .withCompression(Compression.Algorithm.NONE)
                        .withIncludesMvcc(includesMemstoreTS)
                        .withIncludesTags(useTag).build();
    codecs.add(new EncodedDataBlock(d, encoding, rawKVs, meta ));
  }
}
 

import org.apache.hadoop.hbase.KeyValue; //導入方法依賴的package包/類
private void createTFile() throws IOException {
  long totalBytes = 0;
  FSDataOutputStream fout = createFSOutput(path, fs);
  try {
    HFileContext context = new HFileContextBuilder()
                          .withBlockSize(options.minBlockSize)
                          .withCompression(AbstractHFileWriter.compressionByName(options.compress))
                          .build();
    Writer writer = HFile.getWriterFactoryNoCache(conf)
        .withOutputStream(fout)
        .withFileContext(context)
        .withComparator(new KeyValue.RawBytesComparator())
        .create();
    try {
      BytesWritable key = new BytesWritable();
      BytesWritable val = new BytesWritable();
      timer.start();
      for (long i = 0; true; ++i) {
        if (i % 1000 == 0) { // test the size for every 1000 rows.
          if (fs.getFileStatus(path).getLen() >= options.fileSize) {
            break;
          }
        }
        kvGen.next(key, val, false);
        byte [] k = new byte [key.getLength()];
        System.arraycopy(key.getBytes(), 0, k, 0, key.getLength());
        byte [] v = new byte [val.getLength()];
        System.arraycopy(val.getBytes(), 0, v, 0, key.getLength());
        KeyValue kv = new KeyValue(k, CF, QUAL, v);
        writer.append(kv);
        totalBytes += kv.getKeyLength();
        totalBytes += kv.getValueLength();
      }
      timer.stop();
    }
    finally {
      writer.close();
    }
  }
  finally {
    fout.close();
  }
  double duration = (double)timer.read()/1000; // in us.
  long fsize = fs.getFileStatus(path).getLen();

  System.out.printf(
      "time: %s...uncompressed: %.2fMB...raw thrpt: %.2fMB/s\n",
      timer.toString(), (double) totalBytes / 1024 / 1024, totalBytes
          / duration);
  System.out.printf("time: %s...file size: %.2fMB...disk thrpt: %.2fMB/s\n",
      timer.toString(), (double) fsize / 1024 / 1024, fsize / duration);
}