void clear(@NotNull CompressedAppendableFile file) {
      Set<FileChunkKey<CompressedAppendableFile>> toClean = new HashSet<>();
      synchronized (this) {
        myMap.iterateKeys(key -> {
          if (key.getOwner() == file) {
            toClean.add(key);
          }
        });
        for (FileChunkKey<CompressedAppendableFile> key : toClean) {
          myMap.remove(key);
        }
      }
    }
void clear(@NotNull CompressedAppendableFile file)