code: synchronized void removeWriter(Path path) throws IOException {
      WriterInfo val = writerList.get(path);
      if (val != null) {
        LOG.info("Unregeristering writer for path " + path.toString());
        writerList.remove(path);
        totalAllocation -= val.allocation;
        updateScale(false);
      }
    }
docs: Remove the given writer from the pool.
  @param path the file that has been closed