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https://issues.apache.org/jira/browse/FLINK-18581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17161312#comment-17161312
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Andrey Zagrebin commented on FLINK-18581:
-----------------------------------------
Reference.tryHandlePending was introduced somewhen before 8u202 (I have 8u172
where it works).
I checked 8u40, it looks like JVM did not have the optimisation of triggering
the GC phantom cleaner queue in direct memory reservation. They just tried one
GC call which is quite suboptimal for us. Somewhere after 8u40, they factored
out java.lang.ref.Reference#ReferenceHandler#run into static
Reference#tryHandlePending to enable the optimisation.
java.lang.ref.Reference#ReferenceHandler#run is quite similar to
Reference#tryHandlePending in 8u40. We could create an instance of
ReferenceHandler, which is stateless, and call its run method, which uses the
same static vars of Reference class.
Not sure that it is really worth the effort. So alternatively, I can
binary-find the JVM version where they introduced the
Reference#tryHandlePending and we can update the 1.11 release notes that we
support Java 8 starting from that build.
cc [~trohrmann]
> Cannot find GC cleaner with java version previous 8u202
> -------------------------------------------------------
>
> Key: FLINK-18581
> URL: https://issues.apache.org/jira/browse/FLINK-18581
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.11.0
> Reporter: Xintong Song
> Priority: Critical
> Fix For: 1.12.0, 1.11.2
>
>
> {{JavaGcCleanerWrapper}} is looking for the package-private method
> {{Reference.tryHandlePending}} using reflection. However, the method is first
> introduced in the version 8u202. Therefore, if an older version JDK is used,
> the method cannot be found and Flink will fail.
> See also this [ML
> thread|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Error-GC-Cleaner-Provider-Flink-1-11-0-td36565.html].
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