mirror of https://github.com/apache/kafka.git
MINOR: fix docs upgrade instructions fro 3.9 and 3.8 (#17447)
* MINOR: Fix upgrade instructions for 3.8 and 3.9 Signed-off-by: Josep Prat <josep.prat@aiven.io> Reviewers: Chia-Ping Tsai <chia7712@gmail.com>, Colin McCabe <colin@cmccabe.xyz>
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@ -20,6 +20,68 @@
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<script id="upgrade-template" type="text/x-handlebars-template">
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<script id="upgrade-template" type="text/x-handlebars-template">
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<h4><a id="upgrade_3_9_0" href="#upgrade_3_9_0">Upgrading to 3.9.0 from any version 0.8.x through 3.8.x</a></h4>
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<h4><a id="upgrade_3_9_0" href="#upgrade_3_9_0">Upgrading to 3.9.0 from any version 0.8.x through 3.8.x</a></h4>
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<h5><a id="upgrade_390_zk" href="#upgrade_390_zk">Upgrading ZooKeeper-based clusters</a></h5>
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<p><b>If you are upgrading from a version prior to 2.1.x, please see the note in step 5 below about the change to the schema used to store consumer offsets.
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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>
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<p><b>For a rolling upgrade:</b></p>
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<ol>
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<li>Update server.properties on all brokers and add the following properties. CURRENT_KAFKA_VERSION refers to the version you
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are upgrading from. CURRENT_MESSAGE_FORMAT_VERSION refers to the message format version currently in use. If you have previously
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overridden the message format version, you should keep its current value. Alternatively, if you are upgrading from a version prior
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to 0.11.0.x, then CURRENT_MESSAGE_FORMAT_VERSION should be set to match CURRENT_KAFKA_VERSION.
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<ul>
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<li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g. <code>3.8</code>, <code>3.7</code>, etc.)</li>
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<li>log.message.format.version=CURRENT_MESSAGE_FORMAT_VERSION (See <a href="#upgrade_10_performance_impact">potential performance impact
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following the upgrade</a> for the details on what this configuration does.)</li>
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</ul>
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If you are upgrading from version 2.4.0 or above, and you have not overridden the message format, then you only need to override
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the inter-broker protocol version. However, before doing this, make sure ZooKeeper is upgraded to version 3.8.3 or higher.
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<ul>
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<li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g. <code>3.8</code>, <code>3.7</code>, etc.)</li>
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</ul>
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</li>
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<li>Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the
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brokers will be running the latest version and you can verify that the cluster's behavior and performance meets expectations.
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It is still possible to downgrade at this point if there are any problems.
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</li>
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<li>Once the cluster's behavior and performance has been verified, bump the protocol version by editing
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<code>inter.broker.protocol.version</code> and setting it to <code>3.9</code>.
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</li>
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<li>Restart the brokers one by one for the new protocol version to take effect. Once the brokers begin using the latest
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protocol version, it will no longer be possible to downgrade the cluster to an older version.
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</li>
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<li>If you have overridden the message format version as instructed above, then you need to do one more rolling restart to
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upgrade it to its latest version. Once all (or most) consumers have been upgraded to 0.11.0 or later,
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change log.message.format.version to 3.8 on each broker and restart them one by one. Note that the older Scala clients,
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which are no longer maintained, do not support the message format introduced in 0.11, so to avoid conversion costs
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(or to take advantage of <a href="#upgrade_11_exactly_once_semantics">exactly once semantics</a>),
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the newer Java clients must be used.
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</li>
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</ol>
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<h5><a id="upgrade_390_kraft" href="#upgrade_390_kraft">Upgrading KRaft-based clusters</a></h5>
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<p><b>If you are upgrading from a version prior to 3.3.0, please see the note in step 3 below. Once you have changed the metadata.version to the latest version, it will not be possible to downgrade to a version prior to 3.3-IV0.</b></p>
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<p><b>For a rolling upgrade:</b></p>
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<ol>
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<li>Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the
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brokers will be running the latest version and you can verify that the cluster's behavior and performance meets expectations.
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</li>
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<li>Once the cluster's behavior and performance has been verified, bump the metadata.version by running
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<code>
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bin/kafka-features.sh upgrade --metadata 3.9
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</code>
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</li>
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<li>Note that cluster metadata downgrade is not supported in this software version.
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Every <a href="https://github.com/apache/kafka/blob/trunk/server-common/src/main/java/org/apache/kafka/server/common/MetadataVersion.java">MetadataVersion</a>
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after 3.2.x has a boolean parameter that indicates if there are metadata changes (i.e. <code>IBP_3_3_IV3(7, "3.3", "IV3", true)</code> means this version has metadata changes).
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Given your current and target versions, a downgrade is only possible if there are no metadata changes in the versions between.</li>
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</ol>
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<h5><a id="upgrade_390_notable" href="#upgrade_390_notable">Notable changes in 3.9.0</a></h5>
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<h5><a id="upgrade_390_notable" href="#upgrade_390_notable">Notable changes in 3.9.0</a></h5>
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<ul>
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<ul>
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<li>In case you run your Kafka clusters with no execution permission for the <code>/tmp</code> partition, Kafka will not work properly. It might either refuse to start or fail
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<li>In case you run your Kafka clusters with no execution permission for the <code>/tmp</code> partition, Kafka will not work properly. It might either refuse to start or fail
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@ -123,6 +185,67 @@
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<h4><a id="upgrade_3_8_0" href="#upgrade_3_8_0">Upgrading to 3.8.0 from any version 0.8.x through 3.7.x</a></h4>
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<h4><a id="upgrade_3_8_0" href="#upgrade_3_8_0">Upgrading to 3.8.0 from any version 0.8.x through 3.7.x</a></h4>
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<h5><a id="upgrade_380_zk" href="#upgrade_380_zk">Upgrading ZooKeeper-based clusters</a></h5>
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<p><b>If you are upgrading from a version prior to 2.1.x, please see the note in step 5 below about the change to the schema used to store consumer offsets.
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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>
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<p><b>For a rolling upgrade:</b></p>
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<ol>
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<li>Update server.properties on all brokers and add the following properties. CURRENT_KAFKA_VERSION refers to the version you
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are upgrading from. CURRENT_MESSAGE_FORMAT_VERSION refers to the message format version currently in use. If you have previously
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overridden the message format version, you should keep its current value. Alternatively, if you are upgrading from a version prior
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to 0.11.0.x, then CURRENT_MESSAGE_FORMAT_VERSION should be set to match CURRENT_KAFKA_VERSION.
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<ul>
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<li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g. <code>3.7</code>, <code>3.6</code>, etc.)</li>
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<li>log.message.format.version=CURRENT_MESSAGE_FORMAT_VERSION (See <a href="#upgrade_10_performance_impact">potential performance impact
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following the upgrade</a> for the details on what this configuration does.)</li>
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</ul>
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If you are upgrading from version 2.4.0 or above, and you have not overridden the message format, then you only need to override
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the inter-broker protocol version. However, before doing this, make sure ZooKeeper is upgraded to version 3.8.3 or higher.
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<ul>
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<li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g. <code>3.7</code>, <code>3.6</code>, etc.)</li>
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</ul>
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</li>
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<li>Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the
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brokers will be running the latest version and you can verify that the cluster's behavior and performance meets expectations.
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It is still possible to downgrade at this point if there are any problems.
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</li>
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<li>Once the cluster's behavior and performance has been verified, bump the protocol version by editing
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<code>inter.broker.protocol.version</code> and setting it to <code>3.8</code>.
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</li>
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<li>Restart the brokers one by one for the new protocol version to take effect. Once the brokers begin using the latest
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protocol version, it will no longer be possible to downgrade the cluster to an older version.
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</li>
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<li>If you have overridden the message format version as instructed above, then you need to do one more rolling restart to
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upgrade it to its latest version. Once all (or most) consumers have been upgraded to 0.11.0 or later,
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change log.message.format.version to 3.8 on each broker and restart them one by one. Note that the older Scala clients,
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which are no longer maintained, do not support the message format introduced in 0.11, so to avoid conversion costs
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(or to take advantage of <a href="#upgrade_11_exactly_once_semantics">exactly once semantics</a>),
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the newer Java clients must be used.
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</li>
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</ol>
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<h5><a id="upgrade_380_kraft" href="#upgrade_380_kraft">Upgrading KRaft-based clusters</a></h5>
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<p><b>If you are upgrading from a version prior to 3.3.0, please see the note in step 3 below. Once you have changed the metadata.version to the latest version, it will not be possible to downgrade to a version prior to 3.3-IV0.</b></p>
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<p><b>For a rolling upgrade:</b></p>
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<ol>
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<li>Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the
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brokers will be running the latest version and you can verify that the cluster's behavior and performance meets expectations.
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</li>
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<li>Once the cluster's behavior and performance has been verified, bump the metadata.version by running
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<code>
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bin/kafka-features.sh upgrade --metadata 3.8
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</code>
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</li>
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<li>Note that cluster metadata downgrade is not supported in this software version.
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Every <a href="https://github.com/apache/kafka/blob/trunk/server-common/src/main/java/org/apache/kafka/server/common/MetadataVersion.java">MetadataVersion</a>
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after 3.2.x has a boolean parameter that indicates if there are metadata changes (i.e. <code>IBP_3_3_IV3(7, "3.3", "IV3", true)</code> means this version has metadata changes).
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Given your current and target versions, a downgrade is only possible if there are no metadata changes in the versions between.</li>
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</ol>
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<h5><a id="upgrade_380_notable" href="#upgrade_380_notable">Notable changes in 3.8.0</a></h5>
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<h5><a id="upgrade_380_notable" href="#upgrade_380_notable">Notable changes in 3.8.0</a></h5>
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<ul>
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<ul>
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<li>MirrorMaker 2 can now emit checkpoints for offsets mirrored before the start of the Checkpoint task for improved offset translation.
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<li>MirrorMaker 2 can now emit checkpoints for offsets mirrored before the start of the Checkpoint task for improved offset translation.
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