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Date: Wed, 20 Mar 2013 00:59:15 +0000 (UTC)
From: "Jonathan Creasy (JIRA)" <jira@apache.org>
To: dev@kafka.apache.org
Message-ID: <JIRA.12619152.1354812281203.16481.1363741155409@arcas>
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Subject: [jira] [Commented] (KAFKA-656) Add Quotas to Kafka
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    [ https://issues.apache.org/jira/browse/KAFKA-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607129#comment-13607129 ] 

Jonathan Creasy commented on KAFKA-656:
---------------------------------------

Obviously a work in progress.

https://cwiki.apache.org/confluence/display/KAFKA/KAFKA-656+-+Quota+Design
                
> Add Quotas to Kafka
> -------------------
>
>                 Key: KAFKA-656
>                 URL: https://issues.apache.org/jira/browse/KAFKA-656
>             Project: Kafka
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 0.8.1
>            Reporter: Jay Kreps
>              Labels: project
>
> It would be nice to implement a quota system in Kafka to improve our support for highly multi-tenant usage. The goal of this system would be to prevent one naughty user from accidently overloading the whole cluster.
> There are several quantities we would want to track:
> 1. Requests pers second
> 2. Bytes written per second
> 3. Bytes read per second
> There are two reasonable groupings we would want to aggregate and enforce these thresholds at:
> 1. Topic level
> 2. Client level (e.g. by client id from the request)
> When a request hits one of these limits we will simply reject it with a QUOTA_EXCEEDED exception.
> To avoid suddenly breaking things without warning, we should ideally support two thresholds: a soft threshold at which we produce some kind of warning and a hard threshold at which we give the error. The soft threshold could just be defined as 80% (or whatever) of the hard threshold.
> There are nuances to getting this right. If you measure second-by-second a single burst may exceed the threshold, so we need a sustained measurement over a period of time.
> Likewise when do we stop giving this error? To make this work right we likely need to charge against the quota for request *attempts* not just successful requests. Otherwise a client that is overloading the server will just flap on and off--i.e. we would disable them for a period of time but when we re-enabled them they would likely still be abusing us.
> It would be good to a wiki design on how this would all work as a starting point for discussion.

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