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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8940) Inconsistent select count and select distinct
Date Tue, 14 Apr 2015 08:23:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493778#comment-14493778
] 

Benjamin Lerer commented on CASSANDRA-8940:
-------------------------------------------

Thanks for the script [~frensjan].
I will look into the issue this week.

> Inconsistent select count and select distinct
> ---------------------------------------------
>
>                 Key: CASSANDRA-8940
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8940
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: 2.1.2
>            Reporter: Frens Jan Rumph
>            Assignee: Benjamin Lerer
>
> When performing {{select count( * ) from ...}} I expect the results to be consistent
over multiple query executions if the table at hand is not written to / deleted from in the
mean time. However, in my set-up it is not. The counts returned vary considerable (several
percent). The same holds for {{select distinct partition-key-columns from ...}}.
> I have a table in a keyspace with replication_factor = 1 which is something like:
> {code}
> CREATE TABLE tbl (
>     id frozen<id_type>,
>     bucket bigint,
>     offset int,
>     value double,
>     PRIMARY KEY ((id, bucket), offset)
> )
> {code}
> The frozen udt is:
> {code}
> CREATE TYPE id_type (
>     tags map<text, text>
> );
> {code}
> The table contains around 35k rows (I'm not trying to be funny here ...). The consistency
level for the queries was ONE.



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