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https://issues.apache.org/jira/browse/FLINK-13770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913084#comment-16913084
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Stephan Ewen commented on FLINK-13770:
--------------------------------------
Side note: We still use "NIO" as the default type, we could switch to "AUTO" in
the future (and select epoll / kqueue when available).
> Bump Netty to 4.1.39.Final
> --------------------------
>
> Key: FLINK-13770
> URL: https://issues.apache.org/jira/browse/FLINK-13770
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Network
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I quickly went through all the changelogs for Netty 4.1.32 (which we
> currently use) to the latest Netty 4.1.39.Final. Below, you will find a
> list of bug fixes and performance improvements that may affect us. Nice
> changes we could benefit from, also for the Java > 8 efforts. The most
> important ones fixing leaks etc are #8921, #9167, #9274, #9394, and the
> various {{CompositeByteBuf}} fixes. The rest are mostly performance
> improvements.
> Since we are still early in the dev cycle for Flink 1.10, it would be
> nice to update now and verify that the new version works correctly.
> {code}
> Netty 4.1.33.Final
> - Fix ClassCastException and native crash when using kqueue transport
> (#8665)
> - Provide a way to cache the internal nioBuffer of the PooledByteBuffer
> to reduce GC (#8603)
> Netty 4.1.34.Final
> - Do not use GetPrimitiveArrayCritical(...) due multiple not-fixed bugs
> related to GCLocker (#8921)
> - Correctly monkey-patch id also in whe os / arch is used within library
> name (#8913)
> - Further reduce ensureAccessible() overhead (#8895)
> - Support using an Executor to offload blocking / long-running tasks
> when processing TLS / SSL via the SslHandler (#8847)
> - Minimize memory footprint for AbstractChannelHandlerContext for
> handlers that execute in the EventExecutor (#8786)
> - Fix three bugs in CompositeByteBuf (#8773)
> Netty 4.1.35.Final
> - Fix possible ByteBuf leak when CompositeByteBuf is resized (#8946)
> - Correctly produce ssl alert when certificate validation fails on the
> client-side when using native SSL implementation (#8949)
> Netty 4.1.37.Final
> - Don't filter out TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (#9274)
> - Try to mark child channel writable again once the parent channel
> becomes writable (#9254)
> - Properly debounce wakeups (#9191)
> - Don't read from timerfd and eventfd on each EventLoop tick (#9192)
> - Correctly detect that KeyManagerFactory is not supported when using
> OpenSSL 1.1.0+ (#9170)
> - Fix possible unsafe sharing of internal NIO buffer in CompositeByteBuf
> (#9169)
> - KQueueEventLoop won't unregister active channels reusing a file
> descriptor (#9149)
> - Prefer direct io buffers if direct buffers pooled (#9167)
> Netty 4.1.38.Final
> - Prevent ByteToMessageDecoder from overreading when !isAutoRead (#9252)
> - Correctly take length of ByteBufInputStream into account for
> readLine() / readByte() (#9310)
> - availableSharedCapacity will be slowly exhausted (#9394)
> {code}
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