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Posted to dev@kafka.apache.org by Gary Russell <gr...@vmware.com> on 2021/09/03 16:02:59 UTC
Re: [Suspected Spam] Re: [VOTE] 3.0.0 RC1
This [1] is a blocker for me.
Also, the documentation link [2] returns a 404.
[1]: https://issues.apache.org/jira/browse/KAFKA-13262
[2]: https://kafka.apache.org/30/documentation.html
________________________________
From: Ron Dagostino <rn...@gmail.com>
Sent: Thursday, September 2, 2021 9:16 PM
To: dev@kafka.apache.org <de...@kafka.apache.org>
Cc: Users <us...@kafka.apache.org>; kafka-clients <ka...@googlegroups.com>
Subject: [Suspected Spam] Re: [VOTE] 3.0.0 RC1
Hi Konstantine. I have opened a probable blocker ticket
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.apache.org%2Fjira%2Fbrowse%2FKAFKA-13270&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=DmGTJeScZXxP5WoszUhdqsJodj%2FCiHuFPXhSwkedR%2BI%3D&reserved=0. I will work on a PR
shortly. The description on that ticket is as follows:
The implementation of https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.apache.org%2Fjira%2Fbrowse%2FZOOKEEPER-3593&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=5LV9W5CWAQD%2BnnBIcRXXsLUjhN6%2BqQ8ZjSNEZOlprOg%3D&reserved=0 in
ZooKeeper version 3.6.0 decreased the default value for the ZooKeeper
client's `jute.maxbuffer` configuration from 4MB to 1MB. This can cause a
problem if Kafka tries to retrieve a large amount of data across many
znodes – in such a case the ZooKeeper client will repeatedly emit a message
of the form "java.io.IOException: Packet len <####> is out of range" and
the Kafka broker will never connect to ZooKeeper and fail to make progress
on the startup sequence. We can avoid the potential for this issue to occur
by explicitly setting the value to 4MB whenever we create a new ZooKeeper
client as long as no explicit value has been set via the `jute.maxbuffer`
system property.
Ron
On Thu, Sep 2, 2021 at 5:52 PM Israel Ekpo <is...@gmail.com> wrote:
> Magnus,
>
> Please could you share the machine and network specs?
>
> How much CPU, RAM is available on each node?
>
> What JDK, JRE version are you using?
>
> What are your broker and client configuration values? Please could you
> share this info if possible?
>
> Thanks.
>
>
>
> On Wed, Sep 1, 2021 at 10:25 AM Magnus Edenhill <ma...@edenhill.se>
> wrote:
>
> > Hi Konstantine,
> >
> > Some findings from running 3.0.0-RC1 with the librdkafka test suite:
> >
> > * Compaction seems to take slightly longer to kick in when segment sizes
> > exceed their threshold. (Used to take less than 20 seconds, now takes
> > 20..30 seconds.)
> >
> > * CreateTopic seems to take slightly longer to propagate through the
> > cluster,
> > e.g., before a new topic is available in metadata from other brokers.
> >
> > * CreateTopics seems to take longer when the Admin request timeout is
> set,
> > looks like a plateau at 10 seconds:
> > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2Fa%2Fn6y76sj&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=1wARQVJ%2BycVR1GLla70EbZ9o4hPNpmey4wpGcWfzHvI%3D&reserved=0
> >
> > (This is a 3 broker cluster with identical configs between 2.8 and
> 3.0.0.)
> >
> > Nothing critical, but could be an indication of regression so I thought
> I'd
> > mention it.
> >
> > Regards,
> > Magnus
> >
> >
> > Den tis 31 aug. 2021 kl 17:51 skrev Konstantine Karantasis <
> > kkarantasis@apache.org>:
> >
> > > Small correction to my previous email.
> > > The actual link for public preview of the 3.0.0 blog post draft is:
> > >
> > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.apache.org%2Fpreview%2Fkafka%2F%3FpreviewEntry%3Dwhat-s-new-in-apache6&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2F12fmUzsupiMAZy%2FZktR56j6F7njNiUVqNMo6LG6jvQ%3D&reserved=0
> > >
> > > (see also the email thread with title: [DISCUSS] Please review the
> 3.0.0
> > > blog post)
> > >
> > > Best,
> > > Konstantine
> > >
> > > On Tue, Aug 31, 2021 at 6:34 PM Konstantine Karantasis <
> > > kkarantasis@apache.org> wrote:
> > >
> > > >
> > > > Hello Kafka users, developers and client-developers,
> > > >
> > > > This is the second release candidate for Apache Kafka 3.0.0.
> > > > It corresponds to a major release that includes many new features,
> > > > including:
> > > >
> > > > * The deprecation of support for Java 8 and Scala 2.12.
> > > > * Kafka Raft support for snapshots of the metadata topic and
> > > > other improvements in the self-managed quorum.
> > > > * Deprecation of message formats v0 and v1.
> > > > * Stronger delivery guarantees for the Kafka producer enabled by
> > default.
> > > > * Optimizations in OffsetFetch and FindCoordinator requests.
> > > > * More flexible Mirror Maker 2 configuration and deprecation of
> > > > Mirror Maker 1.
> > > > * Ability to restart a connector's tasks on a single call in Kafka
> > > Connect.
> > > > * Connector log contexts and connector client overrides are now
> enabled
> > > > by default.
> > > > * Enhanced semantics for timestamp synchronization in Kafka Streams.
> > > > * Revamped public API for Stream's TaskId.
> > > > * Default serde becomes null in Kafka Streams and several
> > > > other configuration changes.
> > > >
> > > > You may read and review a more detailed list of changes in the 3.0.0
> > blog
> > > > post draft here:
> > > >
> > > >
> > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.apache.org%2Froller-ui%2Fauthoring%2Fpreview%2Fkafka%2F%3FpreviewEntry%3Dwhat-s-new-in-apache6&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=2FkRhhFa25hPsFpsmmdykpBwJ8gyhjtMprYcDJdYAig%3D&reserved=0
> > > >
> > > > Release notes for the 3.0.0 release:
> > > >
> > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhome.apache.org%2F~kkarantasis%2Fkafka-3.0.0-rc1%2FRELEASE_NOTES.html&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=cxER6I5H49zHgOlNtBTazzWynt5tiM81o6XvIrezVPo%3D&reserved=0
> > > >
> > > > *** Please download, test and vote by Wednesday, September 8, 2021
> ***
> > > >
> > > > Kafka's KEYS file containing PGP keys we use to sign the release:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2FKEYS&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xCODs9z81Ja7zFMJgUey%2BGFce38yD9djSxkV99FxDMg%3D&reserved=0
> > > >
> > > > * Release artifacts to be voted upon (source and binary):
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhome.apache.org%2F~kkarantasis%2Fkafka-3.0.0-rc1%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=WL0A4vvZ8jT5CYopAAGCoXWB9pfaItxEPSCEptA283M%3D&reserved=0
> > > >
> > > > * Maven artifacts to be voted upon:
> > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Frepository.apache.org%2Fcontent%2Fgroups%2Fstaging%2Forg%2Fapache%2Fkafka%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Lsc0Uz9GcEo9mYHp7OCj2Ii6bMGlcwsA%2BRE2esl%2FKKw%3D&reserved=0
> > > >
> > > > * Javadoc:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhome.apache.org%2F~kkarantasis%2Fkafka-3.0.0-rc1%2Fjavadoc%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Tfys%2Fk8rmqZ8gUaQbYvlwU5Lh69%2F4QDs%2FW3bXt4YJZY%3D&reserved=0
> > > >
> > > > * Tag to be voted upon (off 3.0 branch) is the 3.0.0 tag:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fapache%2Fkafka%2Freleases%2Ftag%2F3.0.0-rc1&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Tisu%2FNQ6EiI7tgWrhXZVfQhJqUqgPnyJtse27ZldG1o%3D&reserved=0
> > > >
> > > > * Documentation:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2F30%2Fdocumentation.html&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=9qtwMRr48c2CWYbZYeODw4yenaexqfhzo7Cq8d85LFw%3D&reserved=0
> > > >
> > > > * Protocol:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2F30%2Fprotocol.html&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2FFFwlpeIVyMIYcIulLKjRevvxfzsZu1Hp64XqYrdSBo%3D&reserved=0
> > > >
> > > > * Successful Jenkins builds for the 3.0 branch:
> > > > Unit/integration tests:
> > > >
> > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fci-builds.apache.org%2Fblue%2Forganizations%2Fjenkins%2FKafka%252Fkafka%2Fdetail%2F3.0%2F121%2Fpipeline%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=PCQ3NJC0HDoJ4e74qy7gMCrG4t3R%2FAZCgB%2F9YEYvnOs%3D&reserved=0
> > > > (only few flaky failures)
> > > > System tests:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjenkins.confluent.io%2Fjob%2Fsystem-test-kafka%2Fjob%2F3.0%2F57%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=G%2FIJVIpMEzaPZmUhOXKFjPz2MwSOl3BKvr2dPrtHvdk%3D&reserved=0
> > > >
> > > > /**************************************
> > > >
> > > > Thanks,
> > > > Konstantine
> > > >
> > >
> >
>
Re: [Suspected Spam] Re: [VOTE] 3.0.0 RC1
Posted by Tom Bentley <tb...@redhat.com>.
Hi Konstantine,
I just noticed that the new public DescribeConsumerGroupsResult constructor
refers to the non-public API KafkaFutureImpl. If the constructor has to be
public I think it should use the public KafkaFuture. TBH I don't know if
we'd consider a change to the signature after 3.0 to be a compatibility
break given that KafkaFutureImpl is non-public, so people shouldn't be
using it. I opened https://issues.apache.org/jira/browse/KAFKA-13276 and
tagged it as a 3.0 blocker, but if you disagree feel free to remove. PR to
remove use a KafkaFutureImpl from all *Result class constructors available:
https://github.com/apache/kafka/pull/11301
Kind regards,
Tom
On Fri, Sep 3, 2021 at 5:10 PM Gary Russell <gr...@vmware.com> wrote:
> This [1] is a blocker for me.
>
> Also, the documentation link [2] returns a 404.
>
> [1]: https://issues.apache.org/jira/browse/KAFKA-13262
> [2]: https://kafka.apache.org/30/documentation.html
> ________________________________
> From: Ron Dagostino <rn...@gmail.com>
> Sent: Thursday, September 2, 2021 9:16 PM
> To: dev@kafka.apache.org <de...@kafka.apache.org>
> Cc: Users <us...@kafka.apache.org>; kafka-clients <
> kafka-clients@googlegroups.com>
> Subject: [Suspected Spam] Re: [VOTE] 3.0.0 RC1
>
> Hi Konstantine. I have opened a probable blocker ticket
>
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.apache.org%2Fjira%2Fbrowse%2FKAFKA-13270&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=DmGTJeScZXxP5WoszUhdqsJodj%2FCiHuFPXhSwkedR%2BI%3D&reserved=0.
> I will work on a PR
> shortly. The description on that ticket is as follows:
>
> The implementation of
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.apache.org%2Fjira%2Fbrowse%2FZOOKEEPER-3593&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=5LV9W5CWAQD%2BnnBIcRXXsLUjhN6%2BqQ8ZjSNEZOlprOg%3D&reserved=0
> in
> ZooKeeper version 3.6.0 decreased the default value for the ZooKeeper
> client's `jute.maxbuffer` configuration from 4MB to 1MB. This can cause a
> problem if Kafka tries to retrieve a large amount of data across many
> znodes – in such a case the ZooKeeper client will repeatedly emit a message
> of the form "java.io.IOException: Packet len <####> is out of range" and
> the Kafka broker will never connect to ZooKeeper and fail to make progress
> on the startup sequence. We can avoid the potential for this issue to occur
> by explicitly setting the value to 4MB whenever we create a new ZooKeeper
> client as long as no explicit value has been set via the `jute.maxbuffer`
> system property.
>
> Ron
>
> On Thu, Sep 2, 2021 at 5:52 PM Israel Ekpo <is...@gmail.com> wrote:
>
> > Magnus,
> >
> > Please could you share the machine and network specs?
> >
> > How much CPU, RAM is available on each node?
> >
> > What JDK, JRE version are you using?
> >
> > What are your broker and client configuration values? Please could you
> > share this info if possible?
> >
> > Thanks.
> >
> >
> >
> > On Wed, Sep 1, 2021 at 10:25 AM Magnus Edenhill <ma...@edenhill.se>
> > wrote:
> >
> > > Hi Konstantine,
> > >
> > > Some findings from running 3.0.0-RC1 with the librdkafka test suite:
> > >
> > > * Compaction seems to take slightly longer to kick in when segment
> sizes
> > > exceed their threshold. (Used to take less than 20 seconds, now takes
> > > 20..30 seconds.)
> > >
> > > * CreateTopic seems to take slightly longer to propagate through the
> > > cluster,
> > > e.g., before a new topic is available in metadata from other brokers.
> > >
> > > * CreateTopics seems to take longer when the Admin request timeout is
> > set,
> > > looks like a plateau at 10 seconds:
> > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2Fa%2Fn6y76sj&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=1wARQVJ%2BycVR1GLla70EbZ9o4hPNpmey4wpGcWfzHvI%3D&reserved=0
> > >
> > > (This is a 3 broker cluster with identical configs between 2.8 and
> > 3.0.0.)
> > >
> > > Nothing critical, but could be an indication of regression so I thought
> > I'd
> > > mention it.
> > >
> > > Regards,
> > > Magnus
> > >
> > >
> > > Den tis 31 aug. 2021 kl 17:51 skrev Konstantine Karantasis <
> > > kkarantasis@apache.org>:
> > >
> > > > Small correction to my previous email.
> > > > The actual link for public preview of the 3.0.0 blog post draft is:
> > > >
> > > >
> > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.apache.org%2Fpreview%2Fkafka%2F%3FpreviewEntry%3Dwhat-s-new-in-apache6&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2F12fmUzsupiMAZy%2FZktR56j6F7njNiUVqNMo6LG6jvQ%3D&reserved=0
> > > >
> > > > (see also the email thread with title: [DISCUSS] Please review the
> > 3.0.0
> > > > blog post)
> > > >
> > > > Best,
> > > > Konstantine
> > > >
> > > > On Tue, Aug 31, 2021 at 6:34 PM Konstantine Karantasis <
> > > > kkarantasis@apache.org> wrote:
> > > >
> > > > >
> > > > > Hello Kafka users, developers and client-developers,
> > > > >
> > > > > This is the second release candidate for Apache Kafka 3.0.0.
> > > > > It corresponds to a major release that includes many new features,
> > > > > including:
> > > > >
> > > > > * The deprecation of support for Java 8 and Scala 2.12.
> > > > > * Kafka Raft support for snapshots of the metadata topic and
> > > > > other improvements in the self-managed quorum.
> > > > > * Deprecation of message formats v0 and v1.
> > > > > * Stronger delivery guarantees for the Kafka producer enabled by
> > > default.
> > > > > * Optimizations in OffsetFetch and FindCoordinator requests.
> > > > > * More flexible Mirror Maker 2 configuration and deprecation of
> > > > > Mirror Maker 1.
> > > > > * Ability to restart a connector's tasks on a single call in Kafka
> > > > Connect.
> > > > > * Connector log contexts and connector client overrides are now
> > enabled
> > > > > by default.
> > > > > * Enhanced semantics for timestamp synchronization in Kafka
> Streams.
> > > > > * Revamped public API for Stream's TaskId.
> > > > > * Default serde becomes null in Kafka Streams and several
> > > > > other configuration changes.
> > > > >
> > > > > You may read and review a more detailed list of changes in the
> 3.0.0
> > > blog
> > > > > post draft here:
> > > > >
> > > > >
> > > >
> > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.apache.org%2Froller-ui%2Fauthoring%2Fpreview%2Fkafka%2F%3FpreviewEntry%3Dwhat-s-new-in-apache6&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=2FkRhhFa25hPsFpsmmdykpBwJ8gyhjtMprYcDJdYAig%3D&reserved=0
> > > > >
> > > > > Release notes for the 3.0.0 release:
> > > > >
> > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhome.apache.org%2F~kkarantasis%2Fkafka-3.0.0-rc1%2FRELEASE_NOTES.html&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=cxER6I5H49zHgOlNtBTazzWynt5tiM81o6XvIrezVPo%3D&reserved=0
> > > > >
> > > > > *** Please download, test and vote by Wednesday, September 8, 2021
> > ***
> > > > >
> > > > > Kafka's KEYS file containing PGP keys we use to sign the release:
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2FKEYS&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287405487%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xCODs9z81Ja7zFMJgUey%2BGFce38yD9djSxkV99FxDMg%3D&reserved=0
> > > > >
> > > > > * Release artifacts to be voted upon (source and binary):
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhome.apache.org%2F~kkarantasis%2Fkafka-3.0.0-rc1%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=WL0A4vvZ8jT5CYopAAGCoXWB9pfaItxEPSCEptA283M%3D&reserved=0
> > > > >
> > > > > * Maven artifacts to be voted upon:
> > > > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Frepository.apache.org%2Fcontent%2Fgroups%2Fstaging%2Forg%2Fapache%2Fkafka%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Lsc0Uz9GcEo9mYHp7OCj2Ii6bMGlcwsA%2BRE2esl%2FKKw%3D&reserved=0
> > > > >
> > > > > * Javadoc:
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhome.apache.org%2F~kkarantasis%2Fkafka-3.0.0-rc1%2Fjavadoc%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Tfys%2Fk8rmqZ8gUaQbYvlwU5Lh69%2F4QDs%2FW3bXt4YJZY%3D&reserved=0
> > > > >
> > > > > * Tag to be voted upon (off 3.0 branch) is the 3.0.0 tag:
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fapache%2Fkafka%2Freleases%2Ftag%2F3.0.0-rc1&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Tisu%2FNQ6EiI7tgWrhXZVfQhJqUqgPnyJtse27ZldG1o%3D&reserved=0
> > > > >
> > > > > * Documentation:
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2F30%2Fdocumentation.html&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=9qtwMRr48c2CWYbZYeODw4yenaexqfhzo7Cq8d85LFw%3D&reserved=0
> > > > >
> > > > > * Protocol:
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2F30%2Fprotocol.html&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2FFFwlpeIVyMIYcIulLKjRevvxfzsZu1Hp64XqYrdSBo%3D&reserved=0
> > > > >
> > > > > * Successful Jenkins builds for the 3.0 branch:
> > > > > Unit/integration tests:
> > > > >
> > > >
> > >
> >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fci-builds.apache.org%2Fblue%2Forganizations%2Fjenkins%2FKafka%252Fkafka%2Fdetail%2F3.0%2F121%2Fpipeline%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=PCQ3NJC0HDoJ4e74qy7gMCrG4t3R%2FAZCgB%2F9YEYvnOs%3D&reserved=0
> > > > > (only few flaky failures)
> > > > > System tests:
> > > > >
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjenkins.confluent.io%2Fjob%2Fsystem-test-kafka%2Fjob%2F3.0%2F57%2F&data=04%7C01%7Cgrussell%40vmware.com%7C54b3dbe5cc6049a3ad8708d96e788b42%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C637662286287415477%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=G%2FIJVIpMEzaPZmUhOXKFjPz2MwSOl3BKvr2dPrtHvdk%3D&reserved=0
> > > > >
> > > > > /**************************************
> > > > >
> > > > > Thanks,
> > > > > Konstantine
> > > > >
> > > >
> > >
> >
>