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https://issues.apache.org/jira/browse/CASSANDRA-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059353#comment-14059353
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Benedict commented on CASSANDRA-7535:
-------------------------------------
If the problem is vnodes, it is quite likely it is related to CASSANDRA-6976.
Although there is no doubt a possible expansion of scope to the actual despatch
of those range queries as well as the calculation of where they should go
> Coverage analysis for range queries
> -----------------------------------
>
> Key: CASSANDRA-7535
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7535
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: David Semeria
> Assignee: Tyler Hobbs
> Fix For: 2.0.10
>
>
> This is a regression related to
> [CASSANDRA-4858|https://issues.apache.org/jira/browse/CASSANDRA-4858]
> Range queries are taking orders of magnitude more time to complete than
> before because the query planner is frequently unable to calculate the
> correct intersection of contiguous ranges for a given node.
> For example, SELECT * FROM TBL should result in exactly one scan at CL.ONE
> when RF = #nodes when in fact it can result in several hundred scans
> (sometimes thousands). The problem is exasperated with vnodes.
> The regression occurred at some point between 2.0.4 (which works fine) and
> 2.0.9.
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