[jira] [Commented] (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:comment-tabpanel&focusedCommentId=14017245#comment-14017245 ] 

Tyler Hobbs commented on CASSANDRA-6906:
----------------------------------------

Just for future reference, CASSANDRA-6976 is the ticket to address this in general.

> 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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