SequenceFileLogWriter.java 文件源码

/**
 * Call this method after init() has been executed
 * 
 * @return whether WAL compression is enabled
 */
static boolean isWALCompressionEnabled(final Metadata metadata) {
  // Check version is >= VERSION?
  Text txt = metadata.get(WAL_VERSION_KEY);
  if (txt == null || Integer.parseInt(txt.toString()) < COMPRESSION_VERSION) {
    return false;
  }
  // Now check that compression type is present.  Currently only one value.
  txt = metadata.get(WAL_COMPRESSION_TYPE_KEY);
  return txt != null && txt.equals(DICTIONARY_COMPRESSION_TYPE);
}