tikimims commented on code in PR #12941:
URL: https://github.com/apache/kafka/pull/12941#discussion_r1042936427
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docs/connect.html:
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@@ -369,6 +369,114 @@ <h4><a id="connect_errorreporting"
href="#connect_errorreporting">Error Reportin
# Tolerate all errors.
errors.tolerance=all</pre>
+ <h4><a id="connect_exactlyonce" href="#connect_exactlyonce">Exactly-once
support</a></h4>
+
+ <p>Kafka Connect is capable of providing exactly-once delivery guarantees
for sink connectors (as of version 0.11.0) and source connectors (as of version
3.3.0). Please note that <b>support for exactly-once delivery is highly
dependent on the type of connector being run.</b> Even if all the correct
worker properties are set in the config for each node in a cluster, if a
connector is not designed to or simply cannot take advantage of the
capabilities of the Kafka Connect framework, exactly-once may not be
possible.</p>
+
+ <h5><a id="connect_exactlyoncesink" href="#connect_exactlyoncesink">Sink
connectors</a></h5>
+
+ <p>If a sink connector supports exactly-once delivery, all that is
necessary to enable exactly-once delivery at the Connect worker level is
ensuring that its consumer group is configured to ignore records in aborted
transactions. This can be done by setting the worker property
<code>consumer.isolation.level</code> to <code>read_committed</code> or, if
running a version of Kafka Connect that supports it, using a <a
href="#connectconfigs_connector.client.config.override.policy">connector client
config override policy</a> that allows the
<code>consumer.override.isolation.level</code> property to be set to
<code>read_committed</code> in individual connector configs. There are no
additional ACL requirements.</p>
+
+ <h5><a id="connect_exactlyoncesource"
href="connect_exactlyoncesource">Source connectors</a></h5>
+
+ <p>If a source connector supports exactly-once delivery, your Connect
cluster must also be configured to enable framework-level support for
exactly-once delivery for source connectors, and additional ACLs will be
necessary if running against a secured Kafka cluster. Note that exactly-once
support for source connectors is currently only available in distributed mode;
standalone Connect workers cannot provide exactly-once guarantees.</p>
+
+ <h6>Worker configuration</h6>
+
+ <p>For new Connect clusters, set the
<code>exactly.once.source.support</code> property to <code>enabled</code> in
the worker config for each node in the cluster. For existing clusters, two
rolling upgrades are necessary. During the first upgrade, the
<code>exactly.once.source.support</code> property should be set to
<code>preparing</code>, and during the second, it should be set to
<code>enabled</code>.</p>
+
+ <h6>ACL requirements</h6>
+
+ <p>With exactly-once source support enabled, the principal for each
Connect worker will require these ACLs:</p>
Review Comment:
```suggestion
<p>With exactly-once source support enabled, the principal for each
Connect worker will require the following ACLs:</p>
```
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