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https://issues.apache.org/jira/browse/KAFKA-3852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398012#comment-15398012
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ASF GitHub Bot commented on KAFKA-3852:
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GitHub user gwenshap opened a pull request:
https://github.com/apache/kafka/pull/1678
KAFKA-3852: Clarify how to handle message format upgrade without kill…
…ing performance
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gwenshap/kafka kafka-3852
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/1678.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1678
----
commit 046919994032cf873f74da7a34db30cb84d3371e
Author: Gwen Shapira <csh...@gmail.com>
Date: 2016-07-28T18:51:27Z
KAFKA-3852: Clarify how to handle message format upgrade without killing
performance
----
> Clarify how to handle message format upgrade without killing performance
> ------------------------------------------------------------------------
>
> Key: KAFKA-3852
> URL: https://issues.apache.org/jira/browse/KAFKA-3852
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.0.0
> Reporter: Ewen Cheslack-Postava
> Assignee: Ewen Cheslack-Postava
> Priority: Blocker
> Fix For: 0.10.0.1
>
>
> The upgrade notes re: performance impact of the message format change in
> 0.10.0.0 are a bit wishy washy in terms of what you *should* do. They
> describe the potential impact and then say (at the end of a paragraph): "To
> avoid such message conversion before consumers are upgraded to 0.10.0.0, one
> can set". This should probably be written as a playbook for doing the upgrade
> without affecting performance and should be a recommendation, not presented
> as just an option. Nobody with an existing cluster wants the perf impact of
> switching their brokers to the new format while consumers are still using the
> old format unless they have a cluster with extremely light load.
> Additionally, if we have some simple benchmark numbers on the performance
> impact on brokers, we should include that information. Today it is very
> unclear how bad that change will be -- 5%, 20%, 90% worse?
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