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From "Marcus Eriksson (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13664) RangeFetchMapCalculator should not try to optimise 'trivial' ranges
Date Fri, 11 Aug 2017 12:27:00 GMT


Marcus Eriksson commented on CASSANDRA-13664:

rerunning tests

I'll try to grab screen shots once they are finished

> RangeFetchMapCalculator should not try to optimise 'trivial' ranges
> -------------------------------------------------------------------
>                 Key: CASSANDRA-13664
>                 URL:
>             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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