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From Manikumar <manikumar.re...@gmail.com>
Subject Re: Kafka log.message.format.version and consumer client versions
Date Tue, 09 May 2017 05:25:16 GMT
yes, It is sufficient to upgrade all consumers to new version. No need to
switch Scala APIs to Java APIs.

On Mon, May 8, 2017 at 10:03 PM, Dave Hamilton <dhamilton@nanigans.com>
wrote:

> Hi, I have a question about the performance implications of upgrading the
> Kafka message format relating to the following from the upgrade
> documentation:
>
> The message format in 0.10.0 includes a new timestamp field and uses
> relative offsets for compressed messages. The on disk message format can be
> configured through log.message.format.version in the server.properties
> file. The default on-disk message format is 0.10.0. If a consumer client is
> on a version before 0.10.0.0, it only understands message formats before
> 0.10.0. In this case, the broker is able to convert messages from the
> 0.10.0 format to an earlier format before sending the response to the
> consumer on an older version. However, the broker can't use zero-copy
> transfer in this case.
>
> Would it be sufficient to upgrade all consumers to the new client version
> (both the Java and Scala clients) to ensure zero-copy transfer is still
> used after upgrading the message version? Or do all consumers using the
> Scala API need to be switched to using the new Java consumer API?
>
> Thanks,
> Dave
>

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