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MINOR: Improve document description in zero-copy (#12099) 

Follow up of #12052 to improve the description.

Reviewer: David Jacot <djacot@confluent.io>
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RivenSun 2022-04-29 23:44:39 +08:00 committed by GitHub
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@ -125,7 +125,7 @@
<p>
This combination of pagecache and sendfile means that on a Kafka cluster where the consumers are mostly caught up you will see no read activity on the disks whatsoever as they will be serving data entirely from cache.
<p>
TLS/SSL libraries operate at the user space (in-kernel <code>SSL_sendfile</code> is currently not supported by Kafka). Due to this restriction, <code>sendfile</code> could not be used when transport layer enables SSL protocol. For enabling
TLS/SSL libraries operate at the user space (in-kernel <code>SSL_sendfile</code> is currently not supported by Kafka). Due to this restriction, <code>sendfile</code> is not used when SSL is enabled. For enabling
SSL configuration, refer to <code>security.protocol</code> and <code>security.inter.broker.protocol</code>
<p>
For more background on the sendfile and zero-copy support in Java, see this <a href="https://developer.ibm.com/articles/j-zerocopy/">article</a>.