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new 123b47c CASSANDRA-17398 February 2022 blog "Apache Cassandra and Java
SE 11 support"
123b47c is described below
commit 123b47c3a13402ee562eb0111defd74883369b25
Author: Diogenese Topper <[email protected]>
AuthorDate: Tue Feb 22 13:15:32 2022 -0800
CASSANDRA-17398 February 2022 blog "Apache Cassandra and Java SE 11 support"
patch by Chris Thornett, Diogenese Topper; reviewed by Erick Ramirez for
CASSANDRA-17398
---
...java-se-11-support-unsplash-michiel-leunens.jpg | Bin 0 -> 116492 bytes
site-content/source/modules/ROOT/pages/blog.adoc | 26 ++++++++++++++
.../Apache-Cassandra-and-Java-SE-11-support.adoc | 39 +++++++++++++++++++++
3 files changed, 65 insertions(+)
diff --git
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diff --git a/site-content/source/modules/ROOT/pages/blog.adoc
b/site-content/source/modules/ROOT/pages/blog.adoc
index 14e51cd..9aa11e9 100644
--- a/site-content/source/modules/ROOT/pages/blog.adoc
+++ b/site-content/source/modules/ROOT/pages/blog.adoc
@@ -14,6 +14,32 @@ NOTES FOR CONTENT CREATORS
[openblock,card-header]
------
[discrete]
+=== Java SE 11 LTS and Apache Cassandra
+[discrete]
+==== February 24, 2022
+------
+[openblock,card-content]
+------
+With the release of version 4.0.2, Cassandra's support
+for Java 11 will no longer be experimental and offers a number of features
including better performance because of better garbage collection.
+
+[openblock,card-btn card-btn--blog]
+--------
+
+[.btn.btn--alt]
+xref:blog/Apache-Cassandra-and-Java-SE-11-support.adoc[Read More]
+--------
+
+------
+----
+//end card
+
+//start card
+[openblock,card shadow relative test]
+----
+[openblock,card-header]
+------
+[discrete]
=== Apache Cassandra Upgrade Advisory
[discrete]
==== February 18, 2022
diff --git
a/site-content/source/modules/ROOT/pages/blog/Apache-Cassandra-and-Java-SE-11-support.adoc
b/site-content/source/modules/ROOT/pages/blog/Apache-Cassandra-and-Java-SE-11-support.adoc
new file mode 100644
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b/site-content/source/modules/ROOT/pages/blog/Apache-Cassandra-and-Java-SE-11-support.adoc
@@ -0,0 +1,39 @@
+= Apache Cassandra and Java SE 11 support
+:page-layout: single-post
+:page-role: blog-post
+:page-post-date: February, 24 2021
+:page-post-author: Chris Thornett
+:description: The Apache Cassandra Community
+:keywords: Java, Cassandra 4.0, garbage collection
+
+:!figure-caption:
+
+.Image credit: https://unsplash.com/@leunesmedia/[Michiel Leunens on Unsplash^]
+image::blog/apache-cassandra-and-java-se-11-support-unsplash-michiel-leunens.jpg[Java
coffee and cake]
+
+In September 2021,
https://www.oracle.com/java/technologies/java-se-support-roadmap.html[Oracle
+announced their new Java support roadmap^]. Part of this announcement included
the designation of certain releases as Long-Term-Support (LTS). LTS releases
are eligible for Oracle's premier and extended support, and a new LTS release
will be announced approximately every two years. As of this announcement, Java
SE 7, 8, 11, and 17 are designated as LTS releases.
+
+The LTS designation is excellent news for Apache Cassandra. As an open source
project aiming to be enterprise-ready, LTS releases give us a target platform
to develop atop. We can focus on utilizing and leveraging language features
that we know will continue to be developed
+and supported, giving all of our users a feeling of stability, predictability,
and confidence.
+
+While earlier versions of Apache Cassandra are built for the Java 8 platform,
with the release of version 4.0.2, Cassandra's support for Java 11 will no
longer be experimental. We will support Java 11 as our LTS release of choice.
+
+=== Better Performance with Better Garbage Collection
+
+Java 11 has many improvements over Java 8. One significant advantage is the
choice of garbage collectors—the process Java uses to remove data that is no
longer needed from memory—which can significantly impact microservice
performance. Garbage collection can cause unpredictable pauses in Java
applications, so any improvements are welcome. There are three promising
garbage collectors in Java 11: G1GC, Shenandoah and ZGC, although we can’t
expressly recommend ZGC or a LTS release as it is [...]
+
+G1GC, or the
+https://docs.oracle.com/en/java/javase/11/gctuning/garbage-first-garbage-collector.html#GUID-ED3AB6D3-FD9B-4447-9EDF-983ED2F7A573[Garbage-First
garbage collector^], is a generational, incremental, parallel, mostly
concurrent, stop-the-world, and evacuating garbage collector. While it is not a
real-time garbage collector, it aims to minimize pause times and could offer
big improvements to Cassandra's performance. New Cassandra 4.0 users should
use G1 and begin with a heap between 20 and 31GB.
+
+In contrast to ZGC, the Shenandoah is a low-latency garbage collector that is
fully supported in JDK 11. It was introduced in JDK 12 but nearly all
functionality has been backported to JDK 11u builds, and it does a good job of
maintaining approximately 10ms pause targets with Cassandra heaps of 12GB.
+
+The other low-latency garbage collector option is the
https://docs.oracle.com/en/java/javase/11/gctuning/z-garbage-collector1.html#GUID-A5A42691-095E-47BA-B6DC-FB4E5FAA43D0[Z
Garbage Collector^], and, as we’ve mentioned, ZGC is still experimental in
Java 11 and not officially recommended. With careful testing and evaluation, it
is possible to use ZGC. It is a scalable, low-latency garbage collector with
sub-microsecond maximum pause times. In addition to its ability to handle much
larger [...]
+
+=== Other Improvements in Java 11
+
+Java 11 offers a
https://medium.com/skills-matter/key-reasons-to-adopt-java-11-f281072b18d9[number
+of other improvements^], such as suites and protocol have been updated to
include TLS v1.3 and associated supporting technologies, performance
enhancements, and better in-memory storage for strings. Many of these
enhancements are immediately utilized by the Apache Cassandra architecture. We
hope that support for Java 11 will show significant performance improvements
for our users. We are also working on adding Java 17 support with a future
major release.
+
+To learn more about Java 11 support in Apache Cassandra,
https://cassandra.apache.org/doc/4.0/cassandra/new/java11.html[check out
+our documentation].
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