CODEWITHSUNDEEP
google-app-engine
Trung
Trung

Reputation: 155

How do I get an instance Id of app engine front server?

And is there a way to send a request directly to that server?

Upvotes: 3

Views: 2447

Answers (5)

Michael
Michael

Reputation: 71

Actually there is a way and it can be useful for pushing new data out to all instances of an application.

from google.appengine.api import modules
instance_id = modules.get_current_instance_id()

ref: GAE Modules Docs

Upvotes: 7

Su Zhang
Su Zhang

Reputation: 2270

With the advent of Modules, you can get the current instance id in a more elegant way:

ModulesServiceFactory.getModulesService().getCurrentInstanceId()

Also, according to this doc, you can route requests specifically to a particular instance by using a URL like

http://instance.version.module.app-id.appspot.com

Note that you need to replace the dot with -dot- to suppress the SSL certificate warning your web client may be complaining about:

http://instance-dot-version-dot-module-dot-app-id.appspot.com

Upvotes: 0

voscausa
voscausa

Reputation: 11706

I use Python and a datetime stamp to identify an instance. This instance id is set by appengine_config.py. To signal other instances I use a flag in memcache, which is checked by the __init__ of my webapp2 request handler. I use signals to other instances to flush the jinja environment and reload dynamic python code, because I could not find another way.

Here is an example of a memcache flag; signalling to reload all dynamic modules, which had been set by instance id: '2012-12-26 16:39:50.072000'

{ u'_all': { u'dyn_reloads_dt': datetime.datetime(2012, 12, 26, 16, 39, 59, 120000),
             u'setter_instance': '2012-12-26 16:39:50.072000'}}

And I starred the feature request from : Ibrahim Arief

Upvotes: 0

dragonx
dragonx

Reputation: 15143

No there isn't.

Usually when someone asks something like this, they're headed in the wrong direction on app engine. Frontend servers get started and shutdown all the time. If you are designing anything that relies on a particular instance, you're doing it wrong. You need to design requests that work no matter what instance they hit.

Consider using backends if you must do that.

Upvotes: 1

user1258245
user1258245

Reputation: 3639

For what purpose?

If you want to test different versions, you can use traffic splitting https://developers.google.com/appengine/docs/adminconsole/trafficsplitting

That is different versions though, and not a specific instance.

Upvotes: 1

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