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https://issues.apache.org/jira/browse/CASSANDRA-9318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604778#comment-14604778
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Aleksey Yeschenko commented on CASSANDRA-9318:
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bq. Nor is it a good idea to try to allow extra reads when write capacity is 
full or vice versa.

Oh, I'm most definitely not suggesting that. I want very tight bounds on reads 
and writes, separately. Some extra breathing room on writes should not allow 
for more reads (of vice versa). I care more about the tail latencies than raw 
throughput, and the former is an issue for us more than the latter is.

> Bound the number of in-flight requests at the coordinator
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-9318
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9318
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>             Fix For: 2.1.x, 2.2.x
>
>
> It's possible to somewhat bound the amount of load accepted into the cluster 
> by bounding the number of in-flight requests and request bytes.
> An implementation might do something like track the number of outstanding 
> bytes and requests and if it reaches a high watermark disable read on client 
> connections until it goes back below some low watermark.
> Need to make sure that disabling read on the client connection won't 
> introduce other issues.



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