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https://issues.apache.org/jira/browse/FLINK-8759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann reopened FLINK-8759:
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Requirement for FLINK-3952.
> Bump Netty to 4.0.56
> --------------------
>
> Key: FLINK-8759
> URL: https://issues.apache.org/jira/browse/FLINK-8759
> Project: Flink
> Issue Type: Improvement
> Components: Network
> Affects Versions: 1.5.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Major
> Fix For: 1.6.0
>
>
> For a bug in Netty's shutdown sequence and overall improvements in Netty, I'd
> like to bump the version (and stay within the 4.0 series for now). The
> problem we faced in the past should not be relevant for credit-based flow
> control anymore and can be worked around (for the fallback code path) by
> restoring {{LengthFieldBasedFrameDecoder}}'s old behaviour of copying
> contents to new buffers instead of slicing the existing one (please refer to
> FLINK-7428 for the inverse direction).
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