+1 to Netty 4
On 2025/01/16 15:12:40 Alexander Fedulov wrote: > Hi all, > > We have one remaining blocker for the 1.19.2 and 1.20.1 releases, namely > the issue associated with ticket FLINK-36510: *"Upgrade Pekko from 1.0.1 to > 1.1.2"* [1]. Here is the context: > > - The flink-rpc module is currently based on Pekko 1.0.1, which bundles > Netty version 3.10.6. Netty 3.10.6 is the last 3.x release and officially > reached EOL more than eight years ago. It contains at least 20 known > critical vulnerabilities [2]. > - FLINK-36510 [1] upgrades flink-rpc to Pekko 1.1.2, which introduces a > long-awaited migration to Netty 4.x. > - Memory allocation in Netty 4.x differs from Netty 3.x and has a larger > memory footprint with default settings [3]. > - Norman Mauerer, Netty's project lead, strongly recommends moving away > from Netty 3 as soon as possible [4]. > - According to Norman, setting -Dio.netty.allocator.type=unpooled should > approximate Netty 3's memory behavior at the expense of performance > improvements that Netty 4 would otherwise provide. That said, Netty 4 with > -Dio.netty.allocator.type=unpooled is not expected to perform worse than > Netty 3. > - Although this change might seem too substantial for a patch release, I > propose proceeding with it due to the accumulated risks of staying on Netty > 3.10.6. This will need to be addressed in a 1.20 as a patch release anyway, > given that 1.20 is designated as LTS, and we can expect Netty 3 to accrue > even more CVEs over time. > > Here you can find more details of the ongoing discussion [5]. > > Looking forward to hearing the community's thoughts on whether we should > proceed with the proposed changes. > > [1] https://issues.apache.org/jira/browse/FLINK-36510 > [2] https://mvnrepository.com/artifact/io.netty/netty/3.10.6.Final > [3] > https://issues.apache.org/jira/browse/FLINK-36510?focusedCommentId=17911219&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17911219 > [4] https://github.com/apache/flink/pull/25866#issuecomment-2595168560 > [5] https://github.com/apache/flink/pull/25866 > > Best, > Alex >
