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https://issues.apache.org/jira/browse/HBASE-26038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786583#comment-17786583
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Bryan Beaudreault commented on HBASE-26038:
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> What I am trying to achieve is to add an experimental support for JDK17. It
> will be interesting to benchmark HBase on ZGC and Shenandoah and determine if
> we should set our default GC to them
I will say that both of these GC algorithms have been backported to JDK11. I've
tried both of them, and they both are much worse than a well tuned G1GC. We
really just make too good use of a generational GC due to persistent caches and
memstore. I think we should keep an eye out for JDK21 which adds Generational
ZGC. That could be a big win.
> Support JDK17
> -------------
>
> Key: HBASE-26038
> URL: https://issues.apache.org/jira/browse/HBASE-26038
> Project: HBase
> Issue Type: New Feature
> Reporter: Wei-Chiu Chuang
> Priority: Major
>
> JDK 17 is the next Java LTS, coming out this September.
> It brings a number of goodies. One of which is the production-ready ZGC
> (available since JDK15). (as well as the Shenandoah GC, available since JDK15)
> After September 2021, there will be three Java LTS versions: Java 8, Java 11
> and Java 17. Java 8 will still be the mainstream SDK in the foreseeable
> future, so I am not looking to take advantage of the new APIs that are only
> available in JDK17. This jira aims to support HBase on all three JDK LTS.
> Porting HBase to JDK17 is not a big hurdle. HBase (master branch) builds
> successfully on JDK17. A few tests fail mostly due to the new (more strict)
> Java module isolation enforcement. I have a small PoC that I will post here
> in the coming days.
> What I am trying to achieve is to add an experimental support for JDK17. It
> will be interesting to benchmark HBase on ZGC and Shenandoah and determine if
> we should set our default GC to them. By then, we'll be able to claim
> production-ready support.
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