public static void unregisterFile(Path cachePath) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Unregistering " + cachePath);
    }
    files.remove(extractSplitId(cachePath));
  }
This is currently only used by Parquet; however, a generally applicable approach is used -
you pass in a set of offset pairs for a file, and the file is cached with these boundaries.
Don't add anything format specific here.
ql/src/java/org/apache/hadoop/hive/llap/LlapCacheAwareFs.java