If the number of tasks is 3, you can have a maximum dop of 3. -> #executers <= #tasks
Have a lock here: https://storm.apache.org/documentation/Understanding-the-parallelism-of-a-Storm-topology.html -Matthias On 06/19/2015 12:31 PM, Harshit Gupta wrote: > Hi Matthias, > > Thanks for your reply. > > Consider this, say the max number of tasks for a bolt B is set to 3. But > at some point of time, I want to deploy B on 6 different machines. How > would I do that ?? > > I am new to Storm and your answer will improve my understanding of the > platform. > > Thanks a lot. > > On 19/06/2015 6:59 pm, "Matthias J. Sax" <[email protected] > <mailto:[email protected]>> wrote: > > Just want to clarify: The number of task is not the number parallel > running bolt instances (called executors, which are threads). So I don't > understand why you don't want to start with the maximum number of tasks? > There should be almost no overhead if you have more tasks than executors > (executors can process multiple tasks and switching between tasks is > light weight). Adjusting the number of executors during runtime can be > done without redeploying (-> "rebalance"), giving you the flexibility > you need. > > -Matthias > > On 06/19/2015 10:09 AM, Nilesh Chhapru wrote: > > Hi Harshit, > > > > > > > > No there isn’t any way you can achieve this without redeploying your > > topology, you may get this feature in the upcoming releases of > storm as > > this is in their roadmap. > > > > > > > > > > > > *Regards*, > > > > *Nilesh Chhapru.* > > > > > > > > *From:*Harshit Gupta [mailto:[email protected] > <mailto:[email protected]>] > > *Sent:* 19 June 2015 11:43 AM > > *To:* [email protected] > <mailto:[email protected]> > > *Subject:* Fwd: DYNAMIC ADJUSTMENT OF NUMBER OF TASKS > > > > > > > > Hello, > > > > I am working on extending the Storm platform and would like to > know the > > scope of dynamically adjusting the number of tasks for a topology. > > > > I don't want to work with a worst-case ceiling on the number of tasks. > > > > Please let me know if there is/isn't a method for dynamically changing > > the number of tasks without restarting the topology. > > > > Thanks. > > > > -- > > > > /With regards,/ > > > > * * > > > > *HARSHIT GUPTA* > > > > Fourth Year Undergraduate Student, > > > > Department Of Computer Science And Engineering, > > > > Indian Institute Of Technology, Kharagpur. > > >
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