I agree, there are several options to mitigate the migration from v2 to v5. yet, Oracle roadmap is to end JDK 11 support in September this year.
________________________________ From: ConradJam <jam.gz...@gmail.com> Sent: Thursday, March 16, 2023 4:36 AM To: dev@flink.apache.org <dev@flink.apache.org> Subject: Re: [Discussion] - Release major Flink version to support JDK 17 (LTS) EXTERNAL EMAIL Thanks for your start this discuss I have been tracking this problem for a long time, until I saw a conversation in ISSUSE a few days ago and learned that the Kryo version problem will affect the JDK17 compilation of snapshots [1] FLINK-24998 , As @cherry said it ruined our whole effort towards JDK17 I am in favor of providing an external tool to migrate from Kryo old version checkpoint to the new Kryo new checkpoint at one time (Maybe this tool start in flink 2.0 ?), does this tool currently have any plans or ideas worth discuss I think it should not be difficult to be compatible with JDK11 and JDK17. We should indeed abandon JDK8 in 2.0.0. It is also mentioned in the doc that it is marked as Deprecated [2] Here I add that we need to pay attention to the version of Scala and the version of JDK17 [1] FLINK-24998 IGSEGV in Kryo / C2 CompilerThread on Java 17 https://issues.apache.org/jira/browse/FLINK-24998 [2] FLINK-30501 Update Flink build instruction to deprecate Java 8 instead of requiring Java 11 https://issues.apache.org/jira/browse/FLINK-30501 Tamir Sagi <tamir.s...@niceactimize.com> 于2023年3月16日周四 00:54写道： > Hey dev community, > > I'm writing this email to kick off a discussion following this epic: > FLINK-15736<https://issues.apache.org/jira/browse/FLINK-15736>. > > We are moving towards JDK 17 (LTS) , the only blocker now is Flink which > currently remains on JDK 11 (LTS). Flink does not support JDK 17 yet, with > no timeline, the reason, based on the aforementioned ticket is the > following tickets > > 1. FLINK-24998 - SIGSEGV in Kryo / C2 CompilerThread on Java 17< > https://issues.apache.org/jira/browse/FLINK-24998>. > 2. FLINK-3154 - Update Kryo version from 2.24.0 to latest Kryo LTS > version<https://issues.apache.org/jira/browse/FLINK-3154> > > My question is whether it is possible to release a major version (Flink > 2.0.0) using the latest Kryo version for those who don't need to restore > old savepoints/checkpoints in newer format. > > 1. Leverage JDK 17 features within JVM > 2. Moving from the old format to the newer one will be handled only > once - a mitigation can be achieved by a conversion tool or external > serializers, both can be provided later on. > > I'd like to emphasize that the next JDK LTS (21) will be released this > September. furthermore, Flink already supports JDK 12-15, which is very > close to JDK 17 (LTS) - that was released in September 2021. JDK 11 will > become a legacy soon, as more frameworks moving towards JDK 17 and are less > likely to support JDK 11 in the near future. (For example, Spring Boot 3 > requires JDK 17 already). > > Thank you for your consideration of my request. > > Tamir. > > > > > Confidentiality: This communication and any attachments are intended for > the above-named persons only and may be confidential and/or legally > privileged. Any opinions expressed in this communication are not > necessarily those of NICE Actimize. If this communication has come to you > in error you must take no action based on it, nor must you copy or show it > to anyone; please delete/destroy and inform the sender by e-mail > immediately. > Monitoring: NICE Actimize may monitor incoming and outgoing e-mails. > Viruses: Although we have taken steps toward ensuring that this e-mail and > attachments are free from any virus, we advise that in keeping with good > computing practice the recipient should ensure they are actually virus free. > -- Best ConradJam Confidentiality: This communication and any attachments are intended for the above-named persons only and may be confidential and/or legally privileged. Any opinions expressed in this communication are not necessarily those of NICE Actimize. If this communication has come to you in error you must take no action based on it, nor must you copy or show it to anyone; please delete/destroy and inform the sender by e-mail immediately. Monitoring: NICE Actimize may monitor incoming and outgoing e-mails. Viruses: Although we have taken steps toward ensuring that this e-mail and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free.
