Question about the start hook

Marco Ceppi marco.ceppi at
Wed Sep 3 19:16:00 UTC 2014

Hi Tim,

Great question, sorry it took me so long to get back to you. I have an
assumption that all hooks run serially on a single unit regardless of
service group, etc. However, I want to say I've seen some kind
serialization between peers. I've cc'd the Juju core mailing list and the
regular juju mailing list to help correct and clarify these statements and
shed some light once and for all.

Finally, once it's been known, I'll be updating the author docs to detail
the execution pattern in detail.

Marco Ceppi

On Sat, Aug 30, 2014 at 6:31 AM, Humphrey, Timothy L (RIS-DAY) <
Timothy.Humphrey at> wrote:

> Marco,
> Do you know the answer to my question, below? Or should I re-phase it?
> Tim
> -----Original Message-----
> From: jorge.castro at [mailto:jorge.castro at] On Behalf Of
> Jorge O. Castro
> Sent: Friday, August 29, 2014 10:18 AM
> To: Humphrey, Timothy L (RIS-DAY); Marco Ceppi
> Subject: Re: Question about the start hook
> That's a good question! CCing in Marco, who should know.
> On Fri, Aug 29, 2014 at 10:16 AM, Humphrey, Timothy L (RIS-DAY) <
> Timothy.Humphrey at> wrote:
> > Jorge,
> >
> > I am using juju charm to deploy to aws, an hpcc cluster, which is
> several instances that work together to complete some job.
> >
> > In my start hook, I'm copying files from S3 to each instance. And, once
> all files are copied to all instances, I perform an operation in my
> hpcc-cluster-relation-joined that tells the master instance that all files
> are copied to all instances.
> >
> > So, my question is, "Do all instances complete the start hook before any
> instance begins the hpcc-cluster-relation-joined hook?"
> >
> > "Or is there a way to make this be true?"
> >
> > Sincerely,
> > Tim
> >
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