Sync severals spouts and bolt in Heron



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I am using Heropy. My topology looks the next way:



Spout1 -> Bolt1 - > Bolt2



Spout2 ---------> Bolt2



So, Bolt2 needs info from both Spout2 and Bolt1 in order to emit the result, however the info from Spout2 comes faster than the info from Bolt1 and Bolt2 has to wait until if has both Spout2 and Bolt1 info. How can I sync information flow using Heron API so that Bolt2 emits the result only after all the info available?










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    0















    I am using Heropy. My topology looks the next way:



    Spout1 -> Bolt1 - > Bolt2



    Spout2 ---------> Bolt2



    So, Bolt2 needs info from both Spout2 and Bolt1 in order to emit the result, however the info from Spout2 comes faster than the info from Bolt1 and Bolt2 has to wait until if has both Spout2 and Bolt1 info. How can I sync information flow using Heron API so that Bolt2 emits the result only after all the info available?










    share|improve this question
























      0












      0








      0








      I am using Heropy. My topology looks the next way:



      Spout1 -> Bolt1 - > Bolt2



      Spout2 ---------> Bolt2



      So, Bolt2 needs info from both Spout2 and Bolt1 in order to emit the result, however the info from Spout2 comes faster than the info from Bolt1 and Bolt2 has to wait until if has both Spout2 and Bolt1 info. How can I sync information flow using Heron API so that Bolt2 emits the result only after all the info available?










      share|improve this question














      I am using Heropy. My topology looks the next way:



      Spout1 -> Bolt1 - > Bolt2



      Spout2 ---------> Bolt2



      So, Bolt2 needs info from both Spout2 and Bolt1 in order to emit the result, however the info from Spout2 comes faster than the info from Bolt1 and Bolt2 has to wait until if has both Spout2 and Bolt1 info. How can I sync information flow using Heron API so that Bolt2 emits the result only after all the info available?







      python heron






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      asked Nov 16 '18 at 14:40









      Alexandr ProskurinAlexandr Proskurin

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          In general the order/synchronization is not guaranteed in streaming. It is hard for spout1 and spout2 themselves to be 100% synchronized I feel.



          I am thinking there is one options you might consider: hooking bolt1 to spout2 and emiting the tuples from spout2 directly, disconnecting bolt2 from spout2. So that bolt1 becomes the source of truth of the ordering.



          Windowing might be another option, but it requires more considerations and works.






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            0














            Heron doesn't synchronize tuples from different components automatically. So you will need to buffer the tuples from Spout2 and wait until the corresponding tuples from Bolt1 arrive, then do the computation.






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              2 Answers
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              2 Answers
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              0














              In general the order/synchronization is not guaranteed in streaming. It is hard for spout1 and spout2 themselves to be 100% synchronized I feel.



              I am thinking there is one options you might consider: hooking bolt1 to spout2 and emiting the tuples from spout2 directly, disconnecting bolt2 from spout2. So that bolt1 becomes the source of truth of the ordering.



              Windowing might be another option, but it requires more considerations and works.






              share|improve this answer



























                0














                In general the order/synchronization is not guaranteed in streaming. It is hard for spout1 and spout2 themselves to be 100% synchronized I feel.



                I am thinking there is one options you might consider: hooking bolt1 to spout2 and emiting the tuples from spout2 directly, disconnecting bolt2 from spout2. So that bolt1 becomes the source of truth of the ordering.



                Windowing might be another option, but it requires more considerations and works.






                share|improve this answer

























                  0












                  0








                  0







                  In general the order/synchronization is not guaranteed in streaming. It is hard for spout1 and spout2 themselves to be 100% synchronized I feel.



                  I am thinking there is one options you might consider: hooking bolt1 to spout2 and emiting the tuples from spout2 directly, disconnecting bolt2 from spout2. So that bolt1 becomes the source of truth of the ordering.



                  Windowing might be another option, but it requires more considerations and works.






                  share|improve this answer













                  In general the order/synchronization is not guaranteed in streaming. It is hard for spout1 and spout2 themselves to be 100% synchronized I feel.



                  I am thinking there is one options you might consider: hooking bolt1 to spout2 and emiting the tuples from spout2 directly, disconnecting bolt2 from spout2. So that bolt1 becomes the source of truth of the ordering.



                  Windowing might be another option, but it requires more considerations and works.







                  share|improve this answer












                  share|improve this answer



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                  answered Nov 16 '18 at 18:20









                  Ning WangNing Wang

                  862




                  862























                      0














                      Heron doesn't synchronize tuples from different components automatically. So you will need to buffer the tuples from Spout2 and wait until the corresponding tuples from Bolt1 arrive, then do the computation.






                      share|improve this answer



























                        0














                        Heron doesn't synchronize tuples from different components automatically. So you will need to buffer the tuples from Spout2 and wait until the corresponding tuples from Bolt1 arrive, then do the computation.






                        share|improve this answer

























                          0












                          0








                          0







                          Heron doesn't synchronize tuples from different components automatically. So you will need to buffer the tuples from Spout2 and wait until the corresponding tuples from Bolt1 arrive, then do the computation.






                          share|improve this answer













                          Heron doesn't synchronize tuples from different components automatically. So you will need to buffer the tuples from Spout2 and wait until the corresponding tuples from Bolt1 arrive, then do the computation.







                          share|improve this answer












                          share|improve this answer



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                          answered Nov 16 '18 at 21:37









                          NengNeng

                          1462




                          1462



























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