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MINOR: Add a note about Zstandard compression in the upgrade docs #5817

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MINOR: Add a note about Zstandard compression in the upgrade docs #5817

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4 changes: 4 additions & 0 deletions docs/upgrade.html
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Expand Up @@ -50,6 +50,10 @@ <h5><a id="upgrade_210_notable" href="#upgrade_210_notable">Notable changes in 2
and insight by viewing the metrics captured from the <code>AdminClient</code>. For more information
see <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-324%3A+Add+method+to+get+metrics%28%29+in+AdminClient">KIP-324</a>
</li>
<li>Kafka now supports Zstandard compression from <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-110%3A+Add+Codec+for+ZStandard+Compression">KIP-110</a>.
You must upgrade the broker as well as clients to make use of it. Consumers prior to 2.1.0 will not be able to read from topics which use
Zstandard compression, so you should not enable it for a topic until all downstream consumers are upgraded. See the KIP for more detail.
</li>
</ul>

<h4><a id="upgrade_2_0_0" href="#upgrade_2_0_0">Upgrading from 0.8.x, 0.9.x, 0.10.0.x, 0.10.1.x, 0.10.2.x, 0.11.0.x, 1.0.x, or 1.1.x to 2.0.0</a></h4>
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