public static Path getCompletedSnapshotDir(final String snapshotName, final Path rootDir) {
    return getSpecifiedSnapshotDir(getSnapshotsDir(rootDir), snapshotName);
  }
Get the directory for a completed 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 snapshotName name of the 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