code: public static Map<String, Object> getConfigForBranch(State taskState, int numBranches, int branch) {
      String typePropertyName =
          ForkOperatorUtils.getPropertyNameForBranch(ConfigurationKeys.WRITER_CODEC_TYPE, numBranches, branch);
      String compressionType = taskState.getProp(typePropertyName);
      if (compressionType == null) {
        return null;
      }
  
      return ImmutableMap.<String, Object>of(COMPRESSION_TYPE_KEY, compressionType);
    }
docs: Retrieve configuration settings for a given branch.
  @param taskState Task state
  @param numBranches # of branches in the state
  @param branch Branch to retrieve
  @return Map of properties for compression