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https://issues.apache.org/jira/browse/CASSANDRA-9608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552632#comment-16552632
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Robert Stupp commented on CASSANDRA-9608:
-----------------------------------------
{quote}I assume this is to handle e.g. the removal of
Unsafe.monitorEnter/monitorExit?
{quote}
Right.
{quote}could go with the {{volatile ReentrantLock}}
{quote}
A {{ReentrantLock}} would need to be allocated and used "pessimistically"
up-front - i.e. for every instance of {{AtomicBTreePartition}}, so some
non-negligible overhead to what we have now.
We could, as [~benedict] proposed, use some "special" handling and gave it [a
try in this
commit|https://github.com/snazy/cassandra/commit/41ea5eb96c95d7896b452df7ae228ecccd95c660].
Haven't tested it though, but it's based on {{SimpleCondition}} instead of
{{Lock}}, because that one is a) already in the code base and b) doesn't
require an explicit {{lock()}}, and therefore prevents the "pessimistic"
allocation and use in every case.
> Support Java 11
> ---------------
>
> Key: CASSANDRA-9608
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9608
> Project: Cassandra
> Issue Type: Task
> Reporter: Robert Stupp
> Assignee: Robert Stupp
> Priority: Minor
> Fix For: 4.x
>
> Attachments: jdk_9_10.patch
>
>
> This ticket is intended to group all issues found to support Java 9 in the
> future.
> From what I've found out so far:
> * Maven dependency {{com.sun:tools:jar:0}} via cobertura cannot be resolved.
> It can be easily solved using this patch:
> {code}
> - <dependency groupId="net.sourceforge.cobertura"
> artifactId="cobertura"/>
> + <dependency groupId="net.sourceforge.cobertura"
> artifactId="cobertura">
> + <exclusion groupId="com.sun" artifactId="tools"/>
> + </dependency>
> {code}
> * Another issue is that {{sun.misc.Unsafe}} no longer contains the methods
> {{monitorEnter}} + {{monitorExit}}. These methods are used by
> {{o.a.c.utils.concurrent.Locks}} which is only used by
> {{o.a.c.db.AtomicBTreeColumns}}.
> I don't mind to start working on this yet since Java 9 is in a too early
> development phase.
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