JimGalasyn commented on code in PR #16313:
URL: https://github.com/apache/kafka/pull/16313#discussion_r1638980033
##########
docs/streams/upgrade-guide.html:
##########
@@ -303,6 +303,61 @@ <h3><a id="streams_api_changes_350"
href="#streams_api_changes_350">Streams API
adds a new config <code>default.client.supplier</code> that allows to
use a custom <code>KafkaClientSupplier</code> without any code changes.
</p>
+ <h3><a id="streams_api_changes_320"
href="#streams_api_changes_320">Streams API changes in 3.2.0</a></h3>
+ <p>
+ RocksDB offers many metrics which are critical to monitor and tune its
performance. Kafka Streams started to make RocksDB metrics accessible
+ like any other Kafka metric via <a
href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-471%3A+Expose+RocksDB+Metrics+in+Kafka+Streams";>KIP-471</a>
in 2.4.0 release.
+ However, the KIP was only partially implemented, and is now completed
with the 3.2.0 release.
+ For a full list of available RocksDB metrics, please consult the <a
href="/{{version}}/documentation/#kafka_streams_client_monitoring">monitoring
documentation</a>.
+ </p>
+
+ <p>
+ Kafka Streams ships with RocksDB and in-memory store implementations
and user can pick which one to use.
+ However, for the DSL, the choice is a per-operator one, making it
cumbersome to switch from the default RocksDB
+ store to in-memory store for all operators, especially for larger
topologies.
+ <a
href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-591%3A+Add+Kafka+Streams+config+to+set+default+state+store";>KIP-591</a>
+ adds a new config <code>default.dsl.store</code> that allows to set
the default store for all DSL operators globally.
Review Comment:
```suggestion
adds a new config <code>default.dsl.store</code> that enables
setting the default store for all DSL operators globally.
```
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