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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