Thanks for a clear point here. On Monday, July 2, 2018 at 6:47:01 PM UTC+4, Jordan (Cloud Platform Support) wrote: > > It is not recommended to change the code that is currently running on a > single App Engine instance. Since App Engine scales its instances of your > application, > <https://cloud.google.com/appengine/docs/standard/nodejs/how-instances-are-managed> > > that single instance may turn down due to low traffic, and you would lose > any changes persisted on that instance. Likewise, new instances created due > to higher traffic will not posses the change you made (since it was only > local to that single instance). Additionally you cannot control which > instance a request will run on. > > It is therefore recommended to directly deploy a new App Engine version > <https://cloud.google.com/appengine/docs/standard/nodejs/testing-and-deploying-your-app#deploying_your_application> > > with your code change, and then migrate your traffic to the new version > <https://cloud.google.com/appengine/docs/standard/nodejs/migrating-traffic#migrating_traffic_to_a_new_version>. > > This way no requests will be made to your new version until you deploy it > and/or migrate traffic to it (as deploying may actually migrate traffic for > you automatically). Once deployed, all requests will now see your > configuration change and run on the new code. > > - Note that Google Groups <https://cloud.google.com/support/docs/groups> > is reserved for general discussions. If you require technical support for > performing the above it is recommended to post your detailed questions > <https://stackoverflow.com/help/how-to-ask> to Stack Exchange > <https://cloud.google.com/support/docs/stackexchange> using the supported > Cloud tags. >
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