ijuma commented on a change in pull request #10918:
URL: https://github.com/apache/kafka/pull/10918#discussion_r656620095
##########
File path: docs/upgrade.html
##########
@@ -21,6 +21,13 @@
<h5><a id="upgrade_300_notable" href="#upgrade_300_notable">Notable changes in
3.0.0</a></h5>
<ul>
+ <li>ZooKeeper has been upgraded to 3.6.3, and that version has a hard
dependency on the
+ <code>io.dropwizard.metrics:metrics-core:3.2.5</code> library due to
the new metrics subsystem added in 3.6.0.
+ Setting
<code>metricsProvider.className=org.apache.zookeeper.metrics.impl.NullMetricsProvider</code>
in your
+ zookeeper.properties file does not remove this dependency. ZooKeeper
will fail to start with
+ <code>java.lang.NoClassDefFoundError:
com/codahale/metrics/Reservoir</code> if you do not have the above library
+ on your CLASSPATH.
+ </li>
Review comment:
Isn't this handled automatically for users?
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