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https://issues.apache.org/jira/browse/CASSANDRA-13664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075518#comment-16075518
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Ariel Weisberg commented on CASSANDRA-13664:
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I still need to look at this in more detail but isn't the issue here that the
streams aren't weighted and the decision made by total weight? RFMC is still
pretty new to me so I need to look at exactly what is being done there.
> 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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