static String getRegionNameFromManifest(final SnapshotRegionManifest manifest) {
    byte[] regionName =
      RegionInfo.createRegionName(ProtobufUtil.toTableName(manifest.getRegionInfo().getTableName()),
        manifest.getRegionInfo().getStartKey().toByteArray(),
        manifest.getRegionInfo().getRegionId(), true);
    return RegionInfo.encodeRegionName(regionName);
  }
Extract the region encoded name from the region manifest
hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotManifest.java