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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2917) expose calculate midrange for token in jmx
Date Wed, 20 Jul 2011 00:23:57 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068083#comment-13068083
] 

Brandon Williams commented on CASSANDRA-2917:
---------------------------------------------

It looks like getBootstrapToken already does the sampling, but falls back to midpoint when
there are less than 3 keys sampled.

> expose calculate midrange for token in jmx
> ------------------------------------------
>
>                 Key: CASSANDRA-2917
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2917
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jackson Chung
>            Priority: Minor
>              Labels: lhf
>
> currently there is no easy way to get midrange, especially for OPP. For simplicity, you
could call OrderPreservingPartitioner.midpoint(Token, Token), that gives you a rough estimate
(and you'd still need to remove non-utf8 characters.)
> A more accurate but difficult way is to sample the keys in that range and pick the midpoint
of those. We should expose that via jmx, because without this, supporting OPP w/o this is
quite challenging.

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