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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-242) Implement method to "evenly" split a Range
Date Wed, 26 Aug 2009 16:55:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748026#action_12748026
] 

Jonathan Ellis commented on CASSANDRA-242:
------------------------------------------

> Patch 1: let's use an annotation instead of special interface to indicate order-preserving-ness


Or even simpler just have a boolean isOrdered method in IPartitioner.

> Implement method to "evenly" split a Range
> ------------------------------------------
>
>                 Key: CASSANDRA-242
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-242
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 0.4
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>             Fix For: 0.4
>
>         Attachments: CASSANDRA-242.diff, CASSANDRA-242.diff, CASSANDRA-242.diff, CASSANDRA-242.diff,
CASSANDRA-242.diff, CASSANDRA-242_part-1.diff, CASSANDRA-242_part-2.diff
>
>
> Two tickets currently depend on being able to deterministically split a Range object
into two "even" Ranges.
> This can be accomplished with RandomPartitioner/BigIntegerToken by taking the average
of the tokens, but the OrderPreservingPartitioner/StringToken implementation uses a Java Collator
to define the sort order of Tokens, which means that they are not necessarily sorted in byte/char
order.
> Collator.getCollationKey(String).toByteArray() gets you a sortable byte array, but there
is no publicly accessible API for converting a similar byte array back into a String.

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