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KAFKA-9760: Add KIP-447 protocol change to upgrade notes #8350

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merged 2 commits into from Mar 26, 2020
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KAFKA-9760: Add KIP-447 protocol change to upgrade notes #8350

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447 protocol change
Mar 25, 2020
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address comments
Mar 26, 2020
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9 changes: 9 additions & 0 deletions docs/upgrade.html
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Expand Up @@ -30,6 +30,15 @@ <h5><a id="upgrade_250_notable" href="#upgrade_250_notable">Notable changes in 2
<code>zookeeper.session.timeout.ms</code> has been increased from 6s to 18s and
<code>replica.lag.time.max.ms</code> from 10s to 30s.</li>
<li>New DSL operator <code>cogroup()</code> has been added for aggregating multiple streams together at once.</li>
<li>Added a new <code>KStream.toTable()</code> API to translate an input event stream into a KTable.</li>
<li>Added a new Serde type <code>Void</code> to represent null keys or null values from input topic.</li>
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It this worth calling out in the top level notes?

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Well, I guess it does no harm either. At least, KIP changes are normally considered major.

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We never listed all KIPs at the top-level summary in the past. Only in the Streams upgrade docs we list all KS related KIPs. But if you think it's important for Kafka users in general we can also keep it.

<li>Deprecated <code>UsePreviousTimeOnInvalidTimestamp</code> and replaced it with <code>UsePartitionTimeOnInvalidTimeStamp</code>.</li>
<li>Improved exactly-once semantics by adding a pending offset fencing mechanism and stronger transactional commit
consistency check, which greatly simplifies the implementation of a scalable exactly-once application.
We also added a new exactly-once semantics code example under
<a href="https://github.com/apache/kafka/tree/2.5/examples">examples</a> folder. Check out
<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-447%3A+Producer+scalability+for+exactly+once+semantics">KIP-447</a>
for the full details.</li>
<li>Scala 2.11 is no longer supported. See
<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-531%3A+Drop+support+for+Scala+2.11+in+Kafka+2.5">KIP-531</a>
for details.</li>
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