public static Path getCompletedSnapshotDir(final SnapshotDescription snapshot,
    final Path rootDir) {
    return getCompletedSnapshotDir(snapshot.getName(), rootDir);
  }
Get the directory for a specified snapshot. This directory is a sub-directory of snapshot root
directory and all the data files for a snapshot are kept under this directory.
@param snapshot snapshot being taken
@param rootDir  hbase root directory
@return the final directory for the completed snapshot
hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotDescriptionUtils.java