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"application_version" is changed although source code is not changed.
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Hiroaki Ukaji <dt3snow.w@...>
Hi.
I have a question about a json field "application_version" in an environment variable "VCAP_APPLICATION". By intuition, "application_version" should be only changed when there is some update for an application. Actually, when an application is terminated for some reasons and restarted automatically, "application_version" remain unchanged. As far as I see it, however, "application_version" is changed when I "cf restart" my application i.e. CCNG should use the same droplet so there are no differences from the one before deployment. If it is possible, could someone please tell me the intention about this implementation? Thanks. Hiroaki UKAJI -- View this message in context: http://cf-dev.70369.x6.nabble.com/cf-dev-application-version-is-changed-although-source-code-is-not-changed-tp2262.html Sent from the CF Dev mailing list archive at Nabble.com. |
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CF Runtime
application_version is mostly an internal cloud foundry concern. The DEAs
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broadcast the application version they are running, and the health manager uses that with what version it expects to be running to converge the system on the desired state. Restarting the app is supposed to terminate the old instances and start the new ones, so they new ones get a new application version so they are separate from the old. Joseph CF Release Integration Team On Thu, Oct 15, 2015 at 2:00 AM, Hiroaki Ukaji <dt3snow.w(a)gmail.com> wrote:
Hi. |
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Hiroaki Ukaji <dt3snow.w@...>
Hi, thanks for your reply.
I understood that "application_version" is mainly used by CF components so I cannot used it as an actual version of application. Thanks. Hiroaki UKAJI -- View this message in context: http://cf-dev.70369.x6.nabble.com/cf-dev-application-version-is-changed-although-source-code-is-not-changed-tp2262p2284.html Sent from the CF Dev mailing list archive at Nabble.com. |
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Gerhard
I was also assuming that app version would not change between app restarts
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(when the same droplet is used). I was wrong. Would it make more sense if the app version was the droplet shasum? On Thursday, 15 October 2015, CF Runtime <cfruntime(a)gmail.com> wrote:
application_version is mostly an internal cloud foundry concern. The DEAs |
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Matthew Sykes <matthew.sykes@...>
The application version really represents the versioned metadata for the
application. It changes regularly. [1] The only guarantee for version is that it will change if the app restarts (could be due to package changes or explicit operation), the health check changes, or the memory changes. The droplet hash is not an appropriate representation of "application" version since it doesn't take enough into account. It is something that could be added to VCAP_APPLICATION but I think people would want to understand why it's needed there. Out of curiosity, are people acting on the application version in a way that breaks things if it changes when the app bits or droplet did not? If so, how? Thanks. [1]: https://github.com/cloudfoundry/cloud_controller_ng/blob/master/app/models/runtime/app.rb#L164-L178 On Fri, Oct 16, 2015 at 3:15 AM, Gerhard Lazu <gerhard(a)cloudcredo.com> wrote: I was also assuming that app version would not change between app restarts -- Matthew Sykes matthew.sykes(a)gmail.com |
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Gerhard
I have only ever needed the app version when counting requests served by a
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specific app build. It's not a common use case and it was easy to work around, so it wasn't really an issue. I was not expecting this behaviour from the application_version value, but it makes sense now. Cheers, Gerhard. On Friday, 16 October 2015, Matthew Sykes <matthew.sykes(a)gmail.com> wrote:
The application version really represents the versioned metadata for the |
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