omkreddy commented on a change in pull request #11539:
URL: https://github.com/apache/kafka/pull/11539#discussion_r760946183
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File path: docs/upgrade.html
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@@ -19,6 +19,48 @@
<script id="upgrade-template" type="text/x-handlebars-template">
+<h4><a id="upgrade_3_1_0" href="#upgrade_3_1_0">Upgrading to 3.1.0 from any
version 0.8.x through 3.0.x</a></h4>
+
+<p><b>If you are upgrading from a version prior to 2.1.x, please see the note
below about the change to the schema used to store consumer offsets.
+ Once you have changed the inter.broker.protocol.version to the latest
version, it will not be possible to downgrade to a version prior to 2.1.</b></p>
+
+<p><b>For a rolling upgrade:</b></p>
+
+<ol>
+ <li>Update server.properties on all brokers and add the following
properties. CURRENT_KAFKA_VERSION refers to the version you
+ are upgrading from. CURRENT_MESSAGE_FORMAT_VERSION refers to the
message format version currently in use. If you have previously
+ overridden the message format version, you should keep its current
value. Alternatively, if you are upgrading from a version prior
+ to 0.11.0.x, then CURRENT_MESSAGE_FORMAT_VERSION should be set to
match CURRENT_KAFKA_VERSION.
+ <ul>
+ <li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g.,
<code>3.0</code>, <code>2.8</code>, etc.)</li>
+ <li>log.message.format.version=CURRENT_MESSAGE_FORMAT_VERSION
(See <a href="#upgrade_10_performance_impact">potential performance impact
+ following the upgrade</a> for the details on what this
configuration does.)</li>
+ </ul>
+ If you are upgrading from version 0.11.0.x or above, and you have not
overridden the message format, then you only need to override
+ the inter-broker protocol version.
+ <ul>
+ <li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g.,
<code>3.0</code>, <code>2.8</code>, etc.)</li>
+ </ul>
+ </li>
+ <li>Upgrade the brokers one at a time: shut down the broker, update the
code, and restart it. Once you have done so, the
+ brokers will be running the latest version and you can verify that the
cluster's behavior and performance meets expectations.
+ It is still possible to downgrade at this point if there are any
problems.
+ </li>
+ <li>Once the cluster's behavior and performance has been verified, bump
the protocol version by editing
+ <code>inter.broker.protocol.version</code> and setting it to
<code>3.1</code>.
+ </li>
+ <li>Restart the brokers one by one for the new protocol version to take
effect. Once the brokers begin using the latest
+ protocol version, it will no longer be possible to downgrade the
cluster to an older version.
+ </li>
+ <li>If you have overridden the message format version as instructed above,
then you need to do one more rolling restart to
+ upgrade it to its latest version. Once all (or most) consumers have
been upgraded to 0.11.0 or later,
+ change log.message.format.version to 2.8 on each broker and restart
them one by one. Note that the older Scala clients,
Review comment:
=> change log.message.format.version to `3.1`
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