SequenceFileLogWriter.java 文件源码

/**
 * Create sequence file Metadata for our WAL file with version and compression
 * type (if any).
 * @param conf
 * @param compress
 * @return Metadata instance.
 */
private static Metadata createMetadata(final Configuration conf,
    final boolean compress) {
  TreeMap<Text, Text> metaMap = new TreeMap<Text, Text>();
  metaMap.put(WAL_VERSION_KEY, WAL_VERSION);
  if (compress) {
    // Currently we only do one compression type.
    metaMap.put(WAL_COMPRESSION_TYPE_KEY, DICTIONARY_COMPRESSION_TYPE);
  }
  return new Metadata(metaMap);
}