Kafka

I am not familiar with the details. Sorry. But many people run with KRaft in production for years already, so I would believe that it's not something to be seriously concerned about. Also, looking into the Jira ticket, a lot of tasks are already resolved: - https://issues.apache.org/jira/browse/KAFKA-12466 (only one open task about "shell tool integration") - https://issues.apache.org/jira/browse/KAFKA-10310 (22/36 tickets resolved) -Matthias On 3/26/26 3:14 PM, Dima Brodsky via users wrote: > Hi Matthias, > > Question regarding 4.x and controller log compaction / snapshotting > facilities. As far as I understand KIP-630 > < https://cwiki.apache.org/confluence/display/KAFKA/KIP-630%3A+Kafka+Raft+Snapshot > > is > still open and being worked on. There is still no mechanism in kraft kafka > 4.x to compact and snapshot controller metadata logs. Is there any concern > that these logs will grow q...

Hello We are running Apache Kafka 3.9.0 in z/OS. We noticed following exception/warning in Kafka logs (it comes frequently, causing space issues due to the huge logs): Ý2026-03-26 23:15:56,003¨ WARN ÝSocketServer listenerType=ZK_BROKER, nodeId=1¨ Unexpected error from / 127.0.0.1 (channelId=127.0.0.1:9092-127.0.0.1:50290-10); closing connection (org.apache.kafka.common.network.Selector) org.apache.kafka.common.KafkaException: Size of FileRecords /global/kafka/SYS/kafka-logs/xxxx.infeed.private.v1-0/00000000000000000000.log has been truncated during write: old size 194, new size 97 .at org.apache.kafka.common.record.FileRecords.writeTo(FileRecords.java:298) .at org.apache.kafka.common.record.DefaultRecordsSend.writeTo(DefaultRecordsSend.java:34) .at org.apache.kafka.common.record.RecordsSend.writeTo(RecordsSend.java:50) .at org.apache.kafka.common.record.MultiRecordsSend.writeTo(MultiRecordsSend.java:93) .at org.apache.kafka.common.network.NetworkSend.write...

Hi Matthias, Question regarding 4.x and controller log compaction / snapshotting facilities. As far as I understand KIP-630 < https://cwiki.apache.org/confluence/display/KAFKA/KIP-630%3A+Kafka+Raft+Snapshot > is still open and being worked on. There is still no mechanism in kraft kafka 4.x to compact and snapshot controller metadata logs. Is there any concern that these logs will grow quickly enough in a large, busy, cluster to impact disk usage or controller startup times? Thanks! ttyl Dima On Thu, Mar 26, 2026 at 1:47 PM Matthias J. Sax < mjsax@apache.org > wrote: > Yes, we recently did 3.9.2 release, because the move to 4.x (which is > the first version w/o ZK) is a somewhat larger step for some users. > > At this point, it's unclear if there will be 3.9.3 release or not. But > as more time progresses, and we get new releases 4.3, 4.4 out, the > probability for a 3.9.3 release decreases. > > I would highly enco...

Yes, we recently did 3.9.2 release, because the move to 4.x (which is the first version w/o ZK) is a somewhat larger step for some users. At this point, it's unclear if there will be 3.9.3 release or not. But as more time progresses, and we get new releases 4.3, 4.4 out, the probability for a 3.9.3 release decreases. I would highly encourage users to make the step off 3.x and onto 4.x. HTH, -Matthias On 3/23/26 9:12 AM, Doug Whitfield via users wrote: > I notice 3.9 is still listed as supported at https://kafka.apache.org/community/downloads/ > > Do we have any thoughts on whether there will be a 3.9.3? > > From: Matthias J. Sax < mjsax@apache.org > > Date: Tuesday, 25 November 2025 at 11:28 > To: users@kafka.apache.org < users@kafka.apache.org > > Subject: Re: Trying to gauge the eol for Kafka 3.9.1. Please help. > > Cf > https://cwiki.apache.org/confluence/display/KAFKA/Time+Based+Release+Plan#Tim...

Hi Jim, The product uses the latest kafka version i.e 4.2.0 wherein the jetty version used is still the old one 12.0.22 kafka/gradle/dependencies.gradle at 4.2.0 · apache/kafka · GitHub< https://github.com/apache/kafka/blob/4.2.0/gradle/dependencies.gradle > Regards Vivek From: Ashish Verma V < ashish.v.verma@ericsson.com > Sent: 24 March 2026 14:02 To: Jim Halfpenny <jim.halfpenny@stackable.tech> Cc: users@kafka.apache.org ; Steven Schlansker < stevenschlansker@gmail.com >; users-subscribe@kafka.apache.org ; Abhishek Kant Rattan < abhishek.kant.rattan@ericsson.com >; Sahil Sharma D < sahil.d.sharma@ericsson.com >; Apoorva Maheshwari < apoorva.maheshwari@ericsson.com >; Vivek Agarwal B < vivek.b.agarwal@ericsson.com > Subject: RE: Version info that supports Jetty v12.0.25 ++ Vivek From: Jim Halfpenny <jim.halfpenny@stackable.tech<mailto: jim.halfpenny@stackable.tech >> Sent: 21 March 2026 15:09 ...

++ Vivek From: Jim Halfpenny <jim.halfpenny@stackable.tech> Sent: 21 March 2026 15:09 To: Ashish Verma V < ashish.v.verma@ericsson.com > Cc: users@kafka.apache.org ; Steven Schlansker < stevenschlansker@gmail.com >; users-subscribe@kafka.apache.org ; Abhishek Kant Rattan < abhishek.kant.rattan@ericsson.com >; Sahil Sharma D < sahil.d.sharma@ericsson.com >; Apoorva Maheshwari < apoorva.maheshwari@ericsson.com > Subject: Re: Version info that supports Jetty v12.0.25 If you look at the dependancies for 4.0.2 and 4.1.2 you can see that Jetty 12.0.25 is present there. https://github.com/apache/kafka/blob/4.0.2/gradle/dependencies.gradle https://github.com/apache/kafka/blob/4.1.2/gradle/dependencies.gradle Kind regards, JIm On 20 Mar 2026, at 05:21, Ashish Verma V < ashish.v.verma@ericsson.com <mailto: ashish.v.verma@ericsson.com >> wrote: Hi Jim, Any update on this query. Thanks Ashish Verma From: Apoorva Ma...

I notice 3.9 is still listed as supported at https://kafka.apache.org/community/downloads/ Do we have any thoughts on whether there will be a 3.9.3? From: Matthias J. Sax < mjsax@apache.org > Date: Tuesday, 25 November 2025 at 11:28 To: users@kafka.apache.org < users@kafka.apache.org > Subject: Re: Trying to gauge the eol for Kafka 3.9.1. Please help. Cf https://cwiki.apache.org/confluence/display/KAFKA/Time+Based+Release+Plan#TimeBasedReleasePlan-WhatIsOurEOLPolicy ? In general, we maintain 3 versions, so with AK 4.2 release, 3.9.x would actually hit EOL. Given that 4.0 is a major change with ZK removal in favor of KRaft, it will most likely be maintained a little longer though. We are currently discussing a 3.9.2 bug-fix release. But it will depend on overall community demand, if their will be a 3.9.3 bug-fix release or not. In general, I would not expect 3.9.x to be maintained too much longer, and migrating off ZK, and to upgrade to 4.x is h...