code: public static void setWriterFileOctalPermissions(State state, int numBranches, int branchId,
        String octalPermissions) {
      state.setProp(
          ForkOperatorUtils.getPropertyNameForBranch(ConfigurationKeys.WRITER_FILE_PERMISSIONS, numBranches, branchId),
          octalPermissions);
    }
docs: Given a {@link String} in octal notation, set a key, value pair in the given {@link State} for the writer to
  use when creating files. This method should be used in conjunction with {@link #deserializeWriterFilePermissions(State, int, int)}.