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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-3518) Back pressure users by request/s instead of concurrent reads/writes
Date Tue, 24 Jun 2014 22:18:25 GMT


Jonathan Ellis resolved CASSANDRA-3518.

    Resolution: Later

> Back pressure users by request/s instead of concurrent reads/writes
> -------------------------------------------------------------------
>                 Key: CASSANDRA-3518
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.2
>            Reporter: Chris Goffinet
> We are running into use cases where it makes a lot of sense to have QoS at the request
level per user. Imagine this case:
> I have a cluster that can do 100,000 req/s. But I want to limit the user to only being
able to do either 50,000 read or write/s per second in the cluster. I rather give back pressure
to the user then make the cluster fall down because the user tried to take down my cluster.

> Also another case we have is where you have experimental features and want to give access
to certain group of customers and let them run experiments on data. You *dont* want them taking
down the cluster, you rather make them fail fast, or slow them down. If I could limit a user
to N req/s for reads or writes, instead of adding back pressure based on # of concurrent requests
in each stage, this would go a long way for us.
> We have had a few incidents where spinning up new features caused unexpected load and
we couldn't stop them without turning the feature off. 

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