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From "David Semeria (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7535) Coverage analysis for range queries
Date Fri, 11 Jul 2014 16:58:04 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Semeria updated CASSANDRA-7535:
-------------------------------------

    Description: 
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.   

  was:
This is a regression related to 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.   


> 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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