public long getNonSharedArchivedStoreFilesSize() {
      return nonSharedHfilesArchiveSize.get();
    }
@return the total size of the store files in the archive which is not shared with other
        snapshots and tables This is only calculated when
        {@link #getSnapshotStats(Configuration, SnapshotProtos.SnapshotDescription, Map)} is
        called with a non-null Map
hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotInfo.java