ableegoldman commented on code in PR #16265:
URL: https://github.com/apache/kafka/pull/16265#discussion_r1637068929
##########
docs/streams/upgrade-guide.html:
##########
@@ -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:
note: we haven't removed this config yet, planning to do so after 3.8
Might still be worth mentioning it here to encourage anyone who was using it
before to switch over to the new config/the new StickyTaskAssignor interface.
So we can keep this wording but just change it from "We removed the internal
config..." to something like "We introduced a new config to replace the
internal config ..."
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