public Pair<Path, Path> preBulkLoadHFile(String srcPathStr, long seqNum) throws IOException {
    Path srcPath = new Path(srcPathStr);
    return getRegionFileSystem().bulkLoadStoreFile(getColumnFamilyName(), srcPath, seqNum);
  }
This method should only be called from Region. It is assumed that the ranges of values in the
HFile fit within the stores assigned region. (assertBulkLoadHFileOk checks this)
@param seqNum sequence Id associated with the HFile
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java