On Tue, May 30, 2017 at 3:32 PM, Oleh Mackiv <omatskiv@redhat.com> wrote:
Hi, 
I think this very much depends on what is the actual limit for number of topics.

Consider this use case, that would max out topics very quickly:
- register alias for each user

that's the idea ;-)

the limit from Google is on the client. If one device subscribs itself to all users... well, there is a bug in the app.
the app itself is not rejected when assigning a token from FCM.  It's not the server 


 
- if user has multiple devices, all his devices will have same alias

that's the idea
 
- if you want to notify some user, you just send notification to his alias and UPS will distribute it to all devices that this user has registere

through that user topic


 

We even suggest this in docs[1]:
"alias: A list of one or more identifiers (such as email or username) to send messages to ALL devices of the user(s)"


P.S: Do you know how much topics you can actually register before you hit the "messaging/too-many-topics" error ?

For sanity it's not documented ;-) I guess it's not that small - since major news apps in the US are using that feature to distribute pushes, for ... news topics  

On Tue, May 30, 2017 at 2:43 PM, Matthias Wessendorf <matzew@apache.org> wrote:
Hi,

on FCM related push, we do, in our client SDK, automatically subscribe a client to an annoymous topic, matching our immutable variant ID.

If users are specifying categories, we do map those into topics as well.

This is the related code in our Android SDK:

How do people feel about doing that for the alias as well ? 

In the past we did not do it, since topics used to be a more restricted resource. Remember, the first notion of topics (GCM v3, at that time) were even limiting the number of max. subscribers?

However, that changed, and I think it would be nice if we just use the topics for each alias of the app as well. This would speed up the time to deliver the push request to the FCM backend, since the UPS would no longer need to look up the device, a push, regardless how many devices, means one small HTTP to Google, per alias (aka topic)

Any thoughts ? 

NOTE: There is a general limit of topic abuse, but that's on the app instance (see [1]), so our APP Developers need to make sure they don't go crazy w/ a gazillion of categories ;-) 

-Matthias




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Oleg Matskiv
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Red Hat Mobile Application Platform
omatskiv@redhat.com

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