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From Prajwal Tuladhar <p...@infynyxx.com>
Subject Re: Storm deploy time lifecycle hook?
Date Thu, 11 Feb 2016 16:19:41 GMT
you can try using Hooks API http://storm.apache.org/documentation/Hooks.html;
add desired block of code which is supposed to run when topology is started
inside prepare() method.



On Thu, Feb 11, 2016 at 3:15 PM Stephen Powis <spowis@salesforce.com> wrote:

> Hey!
>
> I have a question about the storm topology lifecycle.  Are there any hooks
> in the storm deployment/topology lifecycle?  Basically I'd be great if
> there was a way to run a block of code during deployment of a new topology
> that got fired once on each JVM.
>
> The issue we've seen so far is when deploying a topology, sometimes we
> need to setup some kind of shared resource, maybe a connection pool of some
> type (JDBC, HTTP, etc..) and its currently not trivial to do that via the
> bolt prepare methods such that it only happens once per JVM.   Its
> possible, but easy to get wrong :p
>
> Does something already exist within the storm framework for this that
> we've missed?  Is it a case of "you're doing it wrong"?
>
> Thanks!
> Stephen
>

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