public static boolean isEnabled(Configuration conf) {
    return conf.getBoolean(HBASE_LOCALITY_INPUTSTREAM_DERIVE_ENABLED,
      DEFAULT_HBASE_LOCALITY_INPUTSTREAM_DERIVE_ENABLED);
  }
True if we should derive StoreFile HDFSBlockDistribution from the underlying input stream
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.java