Hi Kosala, Thanks for the response. Yeah. I came across that. But that was written in 2012 whereas [1] is more recently. it says "Note that as of Storm 0.8 the parallelism_hint parameter now specifies the ' initial ' number of executors (not tasks!) for that bolt". Also in here[2] Nathan says that "0.8.0 will let you change the parallelism of topologies on the fly" . That's why i raised this concern. So what you are saying is if I set parallelism to 'x' it will have x number of executors forever. Please correct if I am wrong.
[1] http://storm.apache.org/documentation/Understanding-the-parallelism-of-a-Storm-topology.html [2] https://groups.google.com/forum/#!topic/storm-user/Rr9K7f-AMLc Thanks, Tishan On Fri, Mar 13, 2015 at 11:54 AM, Kosala Dissanayake <umaradi...@gmail.com> wrote: > *"initial parallelism value and that value increase dynamically in > run-time."* > > No. The parallelism value is the number of executors you get. This does > not change at run-time. > > Read this. > http://www.michael-noll.com/blog/2012/10/16/understanding-the-parallelism-of-a-storm-topology/ > > On Wed, Mar 11, 2015 at 7:45 PM, tishan pubudu kanishka dahanayakage < > dtishanpub...@gmail.com> wrote: > >> Hi, >> >> I went through this[1] and tried few topology deployments. Just want to >> clear small doubt. According to [1] what i understood was that parallelism >> hint is the initial parallelism value and that value increase dynamically >> in run-time. Last comment on [2] also suggest the same. However when I >> tested it in Storm I did not see parallelism for that Bolt increase with >> load. >> >> Does my understanding about how parallelism hint operates in Storm >> correct. If so do I need to do any more configurations to make it work. >> >> Thanks, >> Tishan >> >> -- >> Regards, >> Tishan >> > > -- Regards, Tishan
