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With Spring 19, High Volume platform events are generally available. Now I want to convert my existing standard volume event into a high volume event.

I tried editing the event object in Setup, it did not give me an option to change the event type.

Secondly, I tried editing the object XML and converting StandardVolume into HighVolume and then deploying via Metadata API(Force.com migration tool), the deployment succeeds without any error, but still, the event type is Standard Volume.

Can we convert Standard Volume event into High Volume Event?

Edit: If we cant convert, what can be the migration strategy?

If, I delete the Standard Volume object(pre destructive xml) and redeploy as High Volume, I will lose events in last 24 hours in Standard Bus. What can be best strategy for a seamless transition?

Update from SF Support: I have received a response form the team as the currently coverting Standard Volume to High Volume is not possible as of now(Team is working on the same. I don't see any specific SLA as of now but hope to be available within 2 releases).

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    Based on my ~14 years of Salesforce experience, if the docs do not say you can do something, you probably can't. I'm pretty sure you'll have to create a new event. – sfdcfox Feb 11 at 12:25
  • @sfdcfox , I thought the same. Can you advise migration strategy for seamless transition? I don't wanna lose events in Standard Volume bus when deleting. – Pranay Jaiswal Feb 11 at 12:34
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    @sfdcfox That's hardly a reliable rule. All sorts of stuff works despite being undocumented. – Adrian Larson Feb 11 at 17:54
  • @AdrianLarson Lots of stuff can work despite being undocumented. I've had a rather enlightening discussion with a certain developer at Salesforce who has strongly advised not using undocumented stuff. It can work, or can it crash your entire org. The documentation are like guardrails. If you choose to ignore them, you do so at your own peril. – sfdcfox Feb 11 at 20:11
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    Have you tried reaching out to Support if there's a way to change the eventType field for Platform Event objects created prior to Winter '19? – Jayant Das Feb 11 at 21:57

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