mjsax commented on a change in pull request #10573:
URL: https://github.com/apache/kafka/pull/10573#discussion_r619876369



##########
File path: docs/streams/upgrade-guide.html
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@@ -93,6 +95,12 @@ <h1>Upgrade Guide and API Changes</h1>
     </p>
 
     <h3><a id="streams_api_changes_300" 
href="#streams_api_changes_300">Streams API changes in 3.0.0</a></h3>
+    <p>
+      The <code>StreamsConfig.EXACTLY_ONCE</code> and 
<code>StreamsConfig.EXACTLY_ONCE_BETA</code> configs have been deprecated, and 
a new <code>StreamsConfig.EXACTLY_ONCE_V2</code> config has been
+      introduced. This is the same feature as eos-beta, but renamed to 
highlight its production-readiness. Users of exactly-once semantics should plan 
to migrate to the eos-v2 config and prepare for the removal of the deprecated 
configs in 4.0 or after at least a year
+      from the release of 3.0, whichever comes last. Note that eos-v2 requires 
broker version 2.5 or higher, like eos-beta, so users should begin to upgrade 
their kafka cluster if necessary. See

Review comment:
       Fair enough.




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