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From Rajiv Kurian <ra...@signalfx.com>
Subject Re: Any gotchas upgrading to 0.9?
Date Tue, 01 Dec 2015 19:14:18 GMT
Thanks folks. Anywhere I can read about client compatibility i.e. old
clients working with new servers and new clients working with old servers?

Thanks,
Rajiv

On Tue, Dec 1, 2015 at 10:54 AM, Jay Kreps <jay@confluent.io> wrote:

> I think the point is that we should ideally try to cover all these in the
> "upgrade" notes.
>
> -Jay
>
> On Tue, Dec 1, 2015 at 10:37 AM, Aditya Auradkar <aauradkar@linkedin.com>
> wrote:
>
> > Rajiv,
> >
> > By default, the quota is unlimited until you decide to configure them
> > explicitly.
> > And yes, we did get rid of "replica.lag.max.messages", so that
> > configuration will no longer apply.
> >
> > Aditya
> >
> > On Tue, Dec 1, 2015 at 10:24 AM, Todd Snyder <tsnyder@blackberry.com>
> > wrote:
> >
> > > The quota page is here:
> > > http://kafka.apache.org/documentation.html#design_quotas
> > >
> > > "By default, each unique client-id receives a fixed quota in bytes/sec
> as
> > > configured by the cluster (quota.producer.default,
> > quota.consumer.default)"
> > >
> > >
> > > I also noticed there's been a change in the replication configuration
> > > while reading:
> > >
> >
> http://www.confluent.io/blog/hands-free-kafka-replication-a-lesson-in-operational-simplicity/
> > >
> > > It may not break anything, but it may impact how you decide to
> configure
> > > and monitor replication
> > >
> > > "Now there is only one value you need to configure on the server which
> is
> > > replica.lag.time.max.ms. The interpretation of this has changed to be
> > the
> > > time for which a replica has been out-of-sync with the leader. Stuck or
> > > failed replicas are detected the same way as before - if a replica
> fails
> > to
> > > send a fetch request for longer than replica.lag.time.max.ms, it is
> > > considered dead and is removed from the ISR. The mechanism of detecting
> > > slow replicas has changed - if a replica starts lagging behind the
> leader
> > > for longer than replica.lag.time.max.ms, then it is considered too
> slow
> > > and is removed from the ISR. So even if there is a spike in traffic and
> > > large batches of messages are written on the leader, unless the replica
> > > consistently remains behind the leader for replica.lag.time.max.ms, it
> > > will not shuffle in and out of the ISR."
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Rajiv Kurian [mailto:rajiv@signalfx.com]
> > > Sent: Tuesday, December 01, 2015 11:57
> > > To: users@kafka.apache.org
> > > Subject: Re: Any gotchas upgrading to 0.9?
> > >
> > > Also I remember reading (can't find now) something about default
> traffic
> > > quotas. I'd hope the default quotas are very large (infinite?) and not
> > > small so that compatibility is maintained. It would be very unfortunate
> > if
> > > some of our traffic was throttled because of the upgrade because of
> magic
> > > defaults. For example we have a certain cluster dedicated to serving a
> > > single important topic and we'd hate for it to be throttled because of
> > > incorrect defaults.
> > >
> > > Thanks,
> > > Rajiv
> > >
> > > On Tue, Dec 1, 2015 at 8:54 AM, Rajiv Kurian <rajiv@signalfx.com>
> wrote:
> > >
> > > > I saw the upgrade path documentation at
> > > > http://kafka.apache.org/documentation.html and that kind of answers
> > (1).
> > > > Not sure if there is anything about client compatibility though.
> > > >
> > > >
> > > > On Tue, Dec 1, 2015 at 8:51 AM, Rajiv Kurian <rajiv@signalfx.com>
> > wrote:
> > > >
> > > >> I plan to upgrade both the server and clients to 0.9. Had a few
> > > questions
> > > >> before I went ahead with the upgrade:
> > > >>
> > > >> 1. Do all brokers need to be on 0.9? Currently we are running 0.8.2.
> > > We'd
> > > >> ideally like to convert only a few brokers to 0.9 and only if we
> don't
> > > see
> > > >> problems convert the rest.
> > > >>
> > > >> 2. Is it possible to run Kafka 0.9 clients (specifically the
> consumer)
> > > >> with Kafka 0.8.2 brokers?
> > > >>
> > > >> Any link to the upgrade path would be really useful.
> > > >>
> > > >> Thanks,
> > > >> Rajiv
> > > >>
> > > >
> > > >
> > >
> >
>

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