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https://issues.apache.org/jira/browse/FLINK-7845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Nowojski resolved FLINK-7845.
-----------------------------------
Resolution: Fixed
This is not a bug in Flink after all. According to discussion in this issue:
https://datastax-oss.atlassian.net/browse/JAVA-1337 this is strange behaviour
that should go away after removing javaassist from the class path or after
upgrading Netty at least to 4.0.45. Since we can not upgrade Netty at the
moment, I have create a PR making {{NettyMessage}} class public.
> 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
> Assignee: Piotr Nowojski
> Priority: Blocker
> Fix For: 1.4.0
>
> Attachments: Screen Shot 2017-11-13 at 14.54.38.png
>
>
> 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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