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https://issues.apache.org/jira/browse/CASSANDRA-6906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13958094#comment-13958094
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Jonathan Ellis commented on CASSANDRA-6906:
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+1
> Skip Replica Calculation for Range Slice on LocalStrategy Keyspace
> ------------------------------------------------------------------
>
> Key: CASSANDRA-6906
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6906
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Tyler Hobbs
> Assignee: Tyler Hobbs
> Priority: Minor
> Fix For: 2.0.7, 2.1 beta2
>
> Attachments: 6906.txt
>
>
> For vnode-enabled clusters, the "Determining replicas to query" portion of
> range slice commands can be expensive. When querying LocalStrategy
> keyspaces, we can safely skip this step. On a 15 node cluster with vnodes,
> skipping this saves about 100ms. This makes a big difference for the
> drivers, which frequently execute queries like "select * from system.peers"
> and "select * from system.local".
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