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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-781) in a cluster, get_range_slice() does not return all the keys it should
Date Thu, 11 Feb 2010 22:18:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-781:
-------------------------------------

    Attachment: 781.txt

new patch attached.

> ERROR 06:25:41,032 Internal error processing get_range_slice 

added InvalidRequestException when start > end, which fixes this.

> The modified test (below) gets stuck in an infinite loop

Your test is buggy. :)

range_slice (like key_range) is start-INCLUSIVE, so if you pass a key that exists as start,
you will always get at least one result, the start one.

> the keys were not being returned in sorted order 

This is working fine for me.  Not sure what you were seeing.

> when there are fewer keys in the specified range, duplicates are returned

Sounds like another illustration of start-inclusiveness.

If you still see problems, can you narrow it down to a specific set of keys, rather than relying
on randomness to maybe reproduce it once in a while?  That would help a lot.  Thanks!


> in a cluster, get_range_slice() does not return all the keys it should
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-781
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-781
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.5
>         Environment: Debian 5 lenny on EC2, Gentoo linux, Windows XP
>            Reporter: bjc
>            Assignee: Jonathan Ellis
>             Fix For: 0.5, 0.6
>
>         Attachments: 781.txt
>
>
> get_range_slice() does not return the same set of keys as get_key_range() in 0.5.0 final.
> I posted a program to reproduce the behavior:
> http://www.mail-archive.com/cassandra-dev@incubator.apache.org/msg01474.html
> Apparently, you must have more than one node to get the behavior. Also, it may depend
on the locations of the nodes on the ring.. I.e., if you don't generate enough keys randomly,
then by chance they could all fall on the same host and you might not see the behavior, although
I was able to get it to happen using only 2 nodes and 10 keys.
> Here are the other emails describing the issue:
> http://www.mail-archive.com/cassandra-user@incubator.apache.org/msg02423.html

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