lucasbru commented on code in PR #16265:
URL: https://github.com/apache/kafka/pull/16265#discussion_r1634503201
##########
docs/streams/upgrade-guide.html:
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@@ -134,11 +134,44 @@ <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 `task.assignor.class` configuration.
+ The configuration can be set to the fully qualified class name of a
custom task assignor implementation
+ that has to extend the new
`org.apache.kafka.streams.processor.assignment.TaskAssignor` interface.
+
+ The new configuration also allows users to bring back the behavior of
the old task assignor
+ `StickyTaskAssignor` that was used before the introduction
`HighAvailabilityTaskAssignor`.
+ If no custom task assignor is configured, the default task assignor
`HighAvailabilityTaskAssignor` is used.
+
+ This change also removes the internal config
`internal.task.assignor.class` that was used for the same
+ purpose. If you were using this config, you should switch to using
`task.assignor.class` instead.
+
+ For more details, see the public interface section of
+ <a
href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-924%3A+customizable+task+assignment+for+Streams";>KIP-924</a>.
+ </p>
+
<p>
The Processor API now support so-called read-only state stores, added
via
<a
href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-813%3A+Shareable+State+Stores";>KIP-813</a>.
- These stores don't have a dedicated changelog topic, but use their
source topic for fault-tolerance,
- simlar to <code>KTables</code> with source-topic optimization enabled.
+ These stores don't have a dedicated changelog topic, but use their
source topic for fault-tolerance,
+ similar to <code>KTables</code> with source-topic optimization enabled.
+ </p>
+
+ <p>
+ To improve detection of leaked state store iterators, we added new
store-level metrics to track the number and
+ age of open iterators. The new metrics are `num-open-iterators`,
`iterator-duration-avg`, `iterator-duration-max`
+ and `oldest-iterator-open-since-ms`. These metrics are available for
all state stores, including RocksDB,
Review Comment:
That was next on the checklist. But I can do it all in one shot
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