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https://issues.apache.org/jira/browse/CASSANDRA-3911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harish Doddi reassigned CASSANDRA-3911:
---------------------------------------

    Assignee: Harish Doddi  (was: Chris Goffinet)
    
> Basic QoS support for helping reduce OOMing cluster
> ---------------------------------------------------
>
>                 Key: CASSANDRA-3911
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3911
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Goffinet
>            Assignee: Harish Doddi
>            Priority: Minor
>             Fix For: 1.2
>
>
> We'd like to propose adding some basic QoS features to Cassandra. There can 
> be a lot to be done here but for v1 to keep things less invasive, and still 
> provide basics we would like to contribute the following features and see if 
> the community thinks this is OK.
> We would set these on server (cassandra.yaml). If threshold is crossed, we 
> throw an exception up to the client.
> 1) Limit how many rows a client can fetch over RPC through multi-get.
> 2) Limit how many columns may be returned (if count > N) throw exception 
> before processing.
> 3) Limit how many rows and columns a client can try to batch mutate.
> This can be added in our Thrift logic, before any processing can be done. The 
> big reason why we want to do this, is so that customers don't shoot 
> themselves in the foot, by making mistakes or not knowing how many columns 
> they might have returned.
> We can build logic like this into a basic client, but I propose one of the 
> features we might want in Cassandra is support for not being able to OOM a 
> node. We've done lots of work around memtable flushing, dropping messages, 
> etc.

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