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From Hans Jespersen <h...@confluent.io>
Subject Re: Disadvantages of Upgrading Kafka server without upgrading client libraries?
Date Tue, 29 Nov 2016 23:31:08 GMT
The performance impact of upgrading and some settings you can use to
mitigate this impact when the majority of your clients are still 0.8.x are
documented on the Apache Kafka website
https://kafka.apache.org/documentation#upgrade_10_performance_impact

-hans

/**
 * Hans Jespersen, Principal Systems Engineer, Confluent Inc.
 * hans@confluent.io (650)924-2670
 */

On Tue, Nov 29, 2016 at 3:27 PM, Apurva Mehta <apurva@confluent.io> wrote:

> I may be wrong, but since there have been message format changes between
> 0.8.2 and 0.10.1, there will be a performance penalty if the clients are
> not also upgraded. This is because you lose the zero-copy semantics on the
> server side as the messages have to be converted to the old format before
> being sent out on the wire to the old clients.
>
> On Tue, Nov 29, 2016 at 10:06 AM, Thomas Becker <tobecker@tivo.com> wrote:
>
> > The only obvious downside I'm aware of is not being able to benefit
> > from the bugfixes in the client. We are essentially doing the same
> > thing; we upgraded the broker side to 0.10.0.0 but have yet to upgrade
> > our clients from 0.8.1.x.
> >
> > On Tue, 2016-11-29 at 09:30 -0500, Tim Visher wrote:
> > > Hi Everyone,
> > >
> > > I have an install of Kafka 0.8.2.1 which I'm upgrading to 0.10.1.0. I
> > > see
> > > that Kafka 0.10.1.0 should be backwards compatible with client
> > > libraries
> > > written for older versions but that newer client libraries are only
> > > compatible with their version and up.
> > >
> > > My question is what disadvantages would there be to never upgrading
> > > the
> > > clients? I'm mainly asking because it would be advantageous to save
> > > some
> > > time here with a little technical debt if the costs weren't too high.
> > > If
> > > there are major issues then I can take on the client upgrade as well.
> > >
> > > Thanks in advance!
> > >
> > > --
> > >
> > > In Christ,
> > >
> > > Timmy V.
> > >
> > > http://blog.twonegatives.com/
> > > http://five.sentenc.es/ -- Spend less time on mail
> > --
> >
> >
> >     Tommy Becker
> >
> >     Senior Software Engineer
> >
> >     O +1 919.460.4747
> >
> >     tivo.com
> >
> >
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>

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