Trident spout merge parallelismHint

[IvyTang]

Here is my code：
               private static String[] stream_names = new String[] { "spout_0", 
"spout_1" };
               for (String stream_name : stream_names) {
                        Stream stream = topology.newStream(stream_name, new 
WordSpout(stream_name, 10000))
              .parallelismHint(1);
                        merge_streams.add(stream);
                }

                TridentState state = topology
                                .merge(merge_streams)
                                .parallelismHint(1)
                                .each(new Fields("spoutName", "log"), new 
ETLFunction(), new Fields("time_index", "count"))
                                .parallelismHint(4)
                                .groupBy(new Fields("time_index"))
                                .persistentAggregate(new 
RedisState.Factory(StateType.NON_TRANSACTIONAL),
                                                new Fields("time_index", 
"count"), new Count(), new Fields("agg"))
                                .parallelismHint(6);

I thought the spout for each spout_name will be only 1 spout，but in fact,each 
spout_name will open 4 spout.
It seems that the 'parallelismHint(1)’ after topology.newStream and 
topology.merge doesn’t work , the parallelismHint(4) affects the spout and the 
ETLFunction().

I just want to config each spout_name for 1 spout , how to config?

And parallelismHint(6) in deed let RedisState be 6 instances.Dose that mean the 
groupBy+ persistentAggregate is parallel by 6 executors?


Thanks!


-- 
Best regards,

Ivy Tang