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https://issues.apache.org/jira/browse/FLINK-7845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249367#comment-16249367
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Chesnay Schepler commented on FLINK-7845:
-----------------------------------------
To get the IllegalAccessError out of the way, [~f.pompermaier] could you modify
the {{NettyMessage}} class to be public and see what happens?
The generated NettyMessageMatcher tries to access a package-private class
(NettyMessage), but it's package declaration is different (and would apparently
fail for all non-public methods).
The matcher is generated by nettys {{JavassistTypeParameterMatcherGenerator}}.
Why this only happens after the Xth loop is still a mystery though.
> Netty Exception when submitting batch job repeatedly
> ----------------------------------------------------
>
> Key: FLINK-7845
> URL: https://issues.apache.org/jira/browse/FLINK-7845
> Project: Flink
> Issue Type: Bug
> Components: Core, Network
> Affects Versions: 1.3.2
> Reporter: Flavio Pompermaier
>
> We had some problems with Flink and Netty so we wrote a small unit test to
> reproduce the memory issues we have in production. It happens that we have to
> restart the Flink cluster because the memory is always increasing from job to
> job.
> The github project is https://github.com/okkam-it/flink-memory-leak and the
> JUnit test is contained in the MemoryLeakTest class (within src/main/test).
> I don't know if this is the root of our problems but at some point, usually
> around the 28th loop, the job fails with the following exception (actually we
> never faced that in production but maybe is related to the memory issue
> somehow...):
> {code:java}
> Caused by: java.lang.IllegalAccessError:
> org/apache/flink/runtime/io/network/netty/NettyMessage
> at
> io.netty.util.internal.__matchers__.org.apache.flink.runtime.io.network.netty.NettyMessageMatcher.match(NoOpTypeParameterMatcher.java)
> at
> io.netty.channel.SimpleChannelInboundHandler.acceptInboundMessage(SimpleChannelInboundHandler.java:95)
> at
> io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:102)
> ... 16 more
> {code}
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