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:
update: we will be renaming the old StickyTaskAssignor class to
LegacyStickyTaskAssignor (if/when [this
PR](https://github.com/apache/kafka/pull/16322) is merged) so perhaps we should
just say something like this:
"If you were using the old internal config
<code>internal.task.assignor.class</code> to plug in a task assignor, please
migrate your code to the new public config and pass in an assignor that
implements the new <code>TaskAssignor</code> interface"
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