protected void writeRegionOpenMarker(WAL wal, long openSeqId) throws IOException {
    Map<byte[], List<Path>> storeFiles = getStoreFiles();
    RegionEventDescriptor regionOpenDesc =
      ProtobufUtil.toRegionEventDescriptor(RegionEventDescriptor.EventType.REGION_OPEN,
        getRegionInfo(), openSeqId, getRegionServerServices().getServerName(), storeFiles);
    WALUtil.writeRegionEventMarker(wal, getReplicationScope(), getRegionInfo(), regionOpenDesc,
      mvcc, regionReplicationSink.orElse(null));
  }
Returns Map of StoreFiles by column family
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java