ableegoldman commented on code in PR #16265:
URL: https://github.com/apache/kafka/pull/16265#discussion_r1637074509
##########
docs/streams/upgrade-guide.html:
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@@ -134,11 +134,38 @@ <h3 class="anchor-heading"><a
id="streams_notable_changes" class="anchor-link"><
</p>
<h4><a id="streams_api_changes_380"
href="#streams_api_changes_380">Streams API changes in 3.8.0</a></h3>
+
+ <p>
+ Kafka Streams now supports customizable task assignment strategies via
the <code>task.assignor.class</code>
+ configuration. The configuration can be set to the fully qualified
class name of a custom task assignor
+ implementation that has to extend the new
+
<code>org.apache.kafka.streams.processor.assignment.TaskAssignor</code>
interface.
+
+ The new configuration also allows users to bring back the behavior of
the old task assignor
+ <code>StickyTaskAssignor</code> that was used before the introduction
if
+ <code>HighAvailabilityTaskAssignor</code>. If no custom task assignor
is configured, the default task assignor
+ <code>HighAvailabilityTaskAssignor</code> is used.
+
+ This change also removes the internal config
<code>internal.task.assignor.class</code> that was used for the same
+ purpose. If you were using this config, you should switch to using
<code>task.assignor.class</code> instead.
Review Comment:
We also now have two StickyTaskAssignor implementations for the interim
"feature flag" period before we remove the old internal config. We should maybe
mention that if people switch from the internal config to the new public
config, they will need to change the StickyTaskAssignor being imported from the
old one to the
`o.a.k.streams.processor.asssignment.assignors.StickyTaskAssignor`
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