send output of two bolts to a single bolt in Storm? -

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what easiest way send output of bolta , boltb boltc. have use joins or there simpler solution. , b have same fields (ts, metric_name, metric_count).

    // kafkaspout --> logdecoder     builder.setbolt(logdecoder_bolt_id, logdecoderbolt, 10).shufflegrouping(kafka_spout_id);      // logdecoder --> countbolt     builder.setbolt(count_bolt_id, countbolt, 10).shufflegrouping(logdecoder_bolt_id);      // logdecoder --> httprescodecountbolt     builder.setbolt(http_res_code_count_bolt_id, http_res_code_count_bolt, 10).shufflegrouping(logdecoder_bolt_id);       # , want send countbolt , httprescodecountbolt output aggregator bolt.      // countbolt --> aggregatwbolt     builder.setbolt(aggregate_bolt_id, aggregatebolt, 5).fieldsgrouping((count_bolt_id), new fields("ts"));      // httprescodecountbolt --> aggregatwbolt     builder.setbolt(aggregate_bolt_id, aggregatebolt, 5).fieldsgrouping((http_res_code_count_bolt_id), new fields("ts"));

is possible ?

yes. add stream-id ("stream1" , "stream2" below) fieldsgrouping call:

boltdeclarer bd = builder.setbolt(aggregate_bolt_id, aggregatebolt, 5);  bd.fieldsgrouping((count_bolt_id), "stream1",  new fields("ts")); bd.fieldsgrouping((http_res_code_count_bolt_id), "stream2", new fields("ts"));

and in execute() method boltc can test see stream tuple came from:

public void execute(tuple tuple) {      if ("stream1".equals(tuple.getsourcestreamid())) {         // came stream1     } else if ("stream2".equals(tuple.getsourcestreamid())) {         // came stream2     }

since know stream tuple came from, don't need have same shape of tuple on 2 streams. de-marshall tuple according stream-id.

you can check see component tuple came (as type think might more appropriate case) instance of component (the task) emitted tuple.


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