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Google App Engine Java App Version

I'm new to GAE Java databases, and I'm not sure how servers relate to application versions. I read the GAE documentation and searched many times and did not find anything that could help.

My questions:

How does a version of an application work in a backend selected from deployed versions? Is it selected in the same way as in the interface, i.e. Are new backend instances using the default version by default?

If so, what exactly is the appcfg backends update [backend] command updated for sure? Just configuration files?

I really think this should be clearer in the GAE docs.

Thanks.

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1 answer

Backends have no versions:

  • You can select the default version for external instances in the admin console, but you cannot do this for backends.

  • Changing the default version of frontend instances does nothing for backend instances.

  • The backend has only one version - the latest updated via appcfg .

Therefore, when you change the code that affects both external and external instances, you need to download it twice.

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Source: https://habr.com/ru/post/1414714/

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