Hi Jeff, The new consumer also supports the old message format without requiring conversion.
Ismael On 11 Jan 2017 6:52 pm, "Jeff Widman" <j...@netskope.com> wrote: > We upgraded our Kafka clusters from 0.8.2.1 to 0.10.0.1, but most of our > consumers use older libraries that do not support the new message format. > So we set the brokers' log.message.format.version to 0.8.2 while we work on > upgrading our consumers. > > In the meantime, I'm worried about a performance problem with consumers > that have upgraded and are requesting messages using the new Kafka 10 > versions of those API calls. > > I may be misunderstanding, but it seems logical that the performance > problem isn't just about old consumers with a new broker. I would think the > performance problem would also exist if we take new brokers, set the log > format to an old version, then have our consumers make API calls using the > Kafka 10 API calls. The broker would need to do on-the-fly conversion from > the 0.8.2 log format up to the 0.10.0 format to send to the new consumers. > This is the inverse problem of what's mentioned here: > https://kafka.apache.org/documentation/#upgrade_10_performance_impact > > Is this a valid problem? >
