[jira] Commented: (CASSANDRA-884) get_range_slice returns multiple copies of each row for ConsistencyLevel > ONE

["AJ Slater (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873785#action_12873785 ] 

AJ Slater commented on CASSANDRA-884:
-------------------------------------

Please re-open or duplicate.

Testing with 0.6-trunk today:

Reading with CL > ONE returns multiple copies of the same column per key consistent with the replicas queried before return. i.e,  for RC=3, a QUORUM read yields 2 copies and an ALL read returns 3.
This is with pycassa get_range() which is using get_range_slice()

I see the same behavior with 0.6.1 and 0.6.2 debs

If my experience is not unique, anyone using get_range_slice is now deluged with duplicate data.

> get_range_slice returns multiple copies of each row for ConsistencyLevel > ONE
> ------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-884
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-884
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.5
>         Environment: 4-cluster Gentoo Linux 2.6.18 with a ReplicationFactor of 2
>            Reporter: Omer van der Horst Jansen
>            Assignee: Omer van der Horst Jansen
>             Fix For: 0.6
>
>         Attachments: 0001-RangeSliceResponseResolver.patch, 884-v2.txt, TestApp2.java
>
>
> I've noticed that both 0.5.1 and 0.6b2 return multiple identical copies of the data stored in my keyspace whenever I make a call to get_range_slice or get_range_slices using
> ConsistencyLevel.QUORUM and ReplicationFactor is greater than one.
> So with ReplicationFactor set to 2 for my application's KeySpace I get double the number of KeySlices that I expect to get. When using ConsistencyLevel.ONE I get only one KeySlice for each row.
> I've seen this happen with Cassandra 0.5.1 and with 0.6 beta 2. The behavior on 0.6 beta 2 is exhibited with both get_range_slice and get_range_slices.
> The attached Java program demonstrates the issue for 0.6 beta 2. The program writes a series of single-column rows into the Standard1 table, and then uses get_range_slice to receive a list of all row. The returned number of rows is consistently twice the number of rows written to the database. I wipe out the database completely before running the test.

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