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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13664) RangeFetchMapCalculator should not try to optimise 'trivial' ranges
Date Tue, 04 Jul 2017 12:29:00 GMT
Marcus Eriksson created CASSANDRA-13664:
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             Summary: 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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