private static Path getDefaultWorkingSnapshotDir(final Path rootDir) {
    return new Path(getSnapshotsDir(rootDir), SNAPSHOT_TMP_DIR_NAME);
  }
Get the default working directory for snapshots - where they are built, where they are
temporarily copied on export, etc.
@param rootDir root directory of the HBase installation
@return Path to the default snapshot tmp directory, relative to the passed root directory
hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotDescriptionUtils.java