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Posted to commits@cassandra.apache.org by "Folke Behrens (JIRA)" <ji...@apache.org> on 2011/02/28 16:59:40 UTC

[jira] Commented: (CASSANDRA-2233) Add unified UUIDType

    [ https://issues.apache.org/jira/browse/CASSANDRA-2233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000353#comment-13000353 ] 

Folke Behrens commented on CASSANDRA-2233:
------------------------------------------

This won't work because it violates the natural order. Imagine two time-based UUIDs {{t0}} and {{t1}} such that {{t0 < t1}}. There is a non-time-based UUID {{x}} such that {{x < t0}} and {{x > t1}}. To remedy this you must not compare both types, you have to sort all time-based UUID either before or after all other UUIDs.

> Add unified UUIDType
> --------------------
>
>                 Key: CASSANDRA-2233
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2233
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7.3
>            Reporter: Ed Anuff
>            Priority: Minor
>         Attachments: UUIDType.java
>
>
> Unified UUIDType comparator, compares as time-based if both UUIDs are time-based, otherwise uses byte comparison.  Based on code from the current LexicalUUIDType and TimeUUIDType comparers, so performance and behavior should be consistent and compatible.

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