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https://issues.apache.org/jira/browse/CASSANDRA-6976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14199315#comment-14199315
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Jonathan Ellis commented on CASSANDRA-6976:
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ISTM that the right design here is not "compute a List of ranges, then scan
each node until we get enough data" but rather, "compute the first node to
query, then compute more nodes only if we don't have enough data after scanning
that one."
> Determining replicas to query is very slow with large numbers of nodes or
> vnodes
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-6976
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6976
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Benedict
> Assignee: Ariel Weisberg
> Labels: performance
> Fix For: 2.1.2
>
> Attachments: GetRestrictedRanges.java, jmh_output.txt,
> make_jmh_work.patch
>
>
> As described in CASSANDRA-6906, this can be ~100ms for a relatively small
> cluster with vnodes, which is longer than it will spend in transit on the
> network. This should be much faster.
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