public static Pair<String, String> getReferredToRegionAndFile(final String referenceFile) {
    Matcher m = REF_NAME_PATTERN.matcher(referenceFile);
    if (m == null || !m.matches()) {
      LOG.warn("Failed match of store file name {}", referenceFile);
      throw new IllegalArgumentException("Failed match of store file name " + referenceFile);
    }
    String referencedRegion = m.group(2);
    String referencedFile = m.group(1);
    LOG.trace("reference {} to region={} file={}", referenceFile, referencedRegion, referencedFile);
    return new Pair<>(referencedRegion, referencedFile);
  }
Returns timestamp when this file was created (as returned by filesystem)
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFileInfo.java