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From "Tyler Hobbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8490) Tombstone stops paging through resultset when distinct keyword is used.
Date Wed, 17 Dec 2014 00:47:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14249229#comment-14249229
] 

Tyler Hobbs commented on CASSANDRA-8490:
----------------------------------------

I was able to reproduce on the latest cassandra-2.1.  This does appear to be limited to {{SELECT
DISTINCT}} queries on the partition key.

> Tombstone stops paging through resultset when distinct keyword is used.
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-8490
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8490
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Driver version: 2.1.3.
> Cassandra version: 2.0.11/2.1.2.
>            Reporter: Frank Limstrand
>            Assignee: Tyler Hobbs
>             Fix For: 2.0.12, 2.1.3
>
>
> Using paging demo code from https://github.com/PatrickCallaghan/datastax-paging-demo
> The code creates and populates a table with 1000 entries and pages through them with
setFetchSize set to 100. If we then delete one entry with 'cqlsh':
> {noformat}
> cqlsh:datastax_paging_demo> delete from datastax_paging_demo.products  where productId
= 'P142'; (The specified productid is number 6 in the resultset.)
> {noformat}
> and run the same query ("Select * from") again we get:
> {noformat}
> [com.datastax.paging.Main.main()] INFO  com.datastax.paging.Main - Paging demo took 0
secs. Total Products : 999
> {noformat}
> which is what we would expect.
> If we then change the "select" statement in dao/ProductDao.java (line 70) from "Select
* from " to "Select DISTINCT productid from " we get this result:
> {noformat}
> [com.datastax.paging.Main.main()] INFO  com.datastax.paging.Main - Paging demo took 0
secs. Total Products : 99
> {noformat}
> So it looks like the tombstone stops the paging behaviour. Is this a bug?
> {noformat}
> DEBUG [Native-Transport-Requests:788] 2014-12-16 10:09:13,431 Message.java (line 319)
Received: QUERY Select DISTINCT productid from datastax_paging_demo.products, v=2
> DEBUG [Native-Transport-Requests:788] 2014-12-16 10:09:13,434 AbstractQueryPager.java
(line 98) Fetched 99 live rows
> DEBUG [Native-Transport-Requests:788] 2014-12-16 10:09:13,434 AbstractQueryPager.java
(line 115) Got result (99) smaller than page size (100), considering pager exhausted
> {noformat}



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