[jira] [Updated] (CASSANDRA-6906) Skip Replica Calculation for Range Slice on LocalStrategy Keyspace

["Tyler Hobbs (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tyler Hobbs updated CASSANDRA-6906:
-----------------------------------

    Attachment: 6906.txt

The attached patch (and [branch|https://github.com/thobbs/cassandra/tree/CASSANDRA-6906]) avoid splitting the queried range when working with LocalStrategy keyspaces.

> 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
>         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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