Jeff Jirsa commented on CASSANDRA-13664:

This is marked ready to commit - is it good to go? That dtest run has already 

> RangeFetchMapCalculator should not try to optimise 'trivial' ranges
> -------------------------------------------------------------------
>                 Key: CASSANDRA-13664
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13664
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>             Fix For: 4.x
> RangeFetchMapCalculator (CASSANDRA-4650) tries to make the number of streams 
> out of each node as even as possible.
> In a typical multi-dc ring the nodes in the dcs are setup using token + 1, 
> creating many tiny ranges. If we only try to optimise over the number of 
> streams, it is likely that the amount of data streamed out of each node is 
> unbalanced.
> We should ignore those trivial ranges and only optimise the big ones, then 
> share the tiny ones over the nodes.

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