kafka-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Bill Bejeck <b...@confluent.io>
Subject Re: [KafkaStreams 1.1.1] partition assignment broken?
Date Mon, 08 Oct 2018 22:26:59 GMT
Hi Bart,

This is a known issue discovered in version 1.1 -
https://issues.apache.org/jira/browse/KAFKA-7144

This issue has been fixed in Kafka Streams 2.0, any chance you can upgrade
to 2.0?

Thanks,
Bill

On Mon, Oct 8, 2018 at 2:46 PM Bart Vercammen <bart@cloutrix.com> wrote:

> Thanks John,
>
> I'll see what I can do regarding the logs ...
> As a side not, our Kafka cluster is running version v1.1.1 in v0.10.2.1 log
> format configuration (due to another issue: KAFKA-6000)
> But, as said, I'll try to come up with some detailed logs, or a scenario to
> reproduce this.
>
> Greets,
> Bart
>
> On Mon, Oct 8, 2018 at 8:37 PM John Roesler <john@confluent.io> wrote:
>
> > Hi Bart,
> >
> > I suspected it might not be feasible to just dump your production logs
> onto
> > the internet.
> >
> > A repro would be even better, but I bet it wouldn't show up when you try
> > and reproduce it. Good luck!
> >
> > If the repro doesn't turn out, maybe you could just extract the
> assignment
> > lines from your logs?
> >
> > Thanks,
> > -John
> >
> > On Mon, Oct 8, 2018 at 1:24 PM Bart Vercammen <bart@cloutrix.com> wrote:
> >
> > > Hi John,
> > >
> > > Zipping up some logs from our running Kafka cluster is going to be a
> bit
> > > difficult.
> > > What I can do is try to reproduce this off-line and capture the logs
> from
> > > there.
> > >
> > > We also had a look in the PartitionAssignor source code (for 1.1.1) and
> > > indeed this behaviour is a bit weird
> > > as from the source code I'd expect equally divided partitions.
> > >
> > > Anyway, hopefully I'll be able to reproduce this issue with some simple
> > > unit-test like code.
> > > I'll post the results when I have more info.
> > >
> > > Greets,
> > > Bart
> > >
> > > On Mon, Oct 8, 2018 at 7:36 PM John Roesler <john@confluent.io> wrote:
> > >
> > > > Hi Bart,
> > > >
> > > > This sounds a bit surprising. Is there any chance you can zip up some
> > > logs
> > > > so we can see the assignment protocol on the nodes?
> > > >
> > > > Thanks,
> > > > -John
> > > >
> > > > On Mon, Oct 8, 2018 at 4:32 AM Bart Vercammen <bart@cloutrix.com>
> > wrote:
> > > >
> > > > > Hi,
> > > > >
> > > > > I recently moved some KafkaStreams applications from v0.10.2.1 to
> > > v1.1.1
> > > > > and now I notice a weird behaviour in the partition assignment.
> > > > > When starting 4 instances of my Kafka Streams application (on
> > v1.1.1) I
> > > > see
> > > > > that 17 of the 20 partitions (of a source topic) are assigned to
1
> > > > instance
> > > > > of the application while the other 3 instances only get 1 partition
> > > > > assigned. (previously (on v0.10.2.1) the all got 5 partitions.)
> > > > >
> > > > > Is this expected behaviour, as I read that quite some improvements
> > were
> > > > > done in the partition assignment strategy for Kafka Streams
> > > applications?
> > > > > If yes, how can I make it so that the partitions are equally
> devided
> > > > again
> > > > > across all running applications?   It's a bit weird in my opinion
> as
> > > this
> > > > > makes scaling the application very hard.
> > > > >
> > > > > Also, when initially starting with 1 instance of the application,
> and
> > > > > gradually scaling up, the new instances only get 1 partition
> assigned
> > > ...
> > > > >
> > > > > All my Streams applications use default configuration (more or
> less),
> > > > > running 1 stream-thread.
> > > > >
> > > > > Any suggestions / enlightenments on this?
> > > > > Greets,
> > > > > Bart
> > > > >
> >
> >
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message