Whats the recommended approach to run parallel operations inside ParDo ?

[kaniska Mandal]

Inside a CompositeTransformation --
>  is it Ok to  spawn threads / use CountDownLatch to perform multiple
ParDo on the same data item at the same item
> or all the calls to individual ParDo inherently parallelized

For example, I need to execute  generateAndStoreGraphData() ,
enerateAndStoreTimeSerieseData1() ,  generateAndStoreTimeSerieseData1()*
-- in parallel .*

static class MultiOps extends PTransform<PCollection<T>, PCollection<T>> {

    public PCollection<T> apply(PCollection<T> dataSet) {

     dataSet.apply(ParDo.of( generateAndStoreGraphData());

     dataSet.apply(ParDo.of( generateAndStoreTimeSerieseData1());
     dataSet.apply(ParDo.of( generateAndStoreTimeSerieseData1());

      return results;

    }

  }

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Thanks

Kaniska