static void configureStoragePolicy(final Configuration conf, final FileSystem fs,
    byte[] tableAndFamily, Path cfPath) {
    if (null == conf || null == fs || null == tableAndFamily || null == cfPath) {
      return;
    }

    String policy = conf.get(STORAGE_POLICY_PROPERTY_CF_PREFIX + Bytes.toString(tableAndFamily),
      conf.get(STORAGE_POLICY_PROPERTY));
    CommonFSUtils.setStoragePolicy(fs, cfPath, policy);
  }
Configure block storage policy for CF after the directory is created.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/HFileOutputFormat2.java