Storm deploy time lifecycle hook?

[Stephen Powis <sp...@salesforce.com>]

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

Re: Storm deploy time lifecycle hook?

[Prajwal Tuladhar <pr...@infynyxx.com>]

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 <sp...@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
>