Jeremy Hanna updated CASSANDRA-11516:
    Complexity: Low Hanging Fruit

> Make max number of streams configurable
> ---------------------------------------
>                 Key: CASSANDRA-11516
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11516
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Legacy/Streaming and Messaging, Local/Config
>            Reporter: Sebastian Estevez
>            Assignee: Giampaolo
>            Priority: Normal
>              Labels: lhf
> Today we default to num cores. In large boxes (many cores), this is 
> suboptimal as it can generate huge amounts of garbage that GC can't keep up 
> with.
> Usually we tackle issues like this with the streaming throughput levers but 
> in this case the problem is CPU consumption by StreamReceiverTasks 
> specifically in the IntervalTree build -- 
> https://github.com/apache/cassandra/blob/cassandra-2.1.12/src/java/org/apache/cassandra/utils/IntervalTree.java#L257
> We need a max number of parallel streams lever to hanlde this.

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