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From "Dave Revell (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4489) Better key splitting in RegionSplitter
Date Wed, 12 Oct 2011 00:11:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125495#comment-13125495
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Dave Revell commented on HBASE-4489:
------------------------------------

@Nicolas, did you know HBase keys are lexicographically ordered? http://wiki.apache.org/hadoop/Hbase/DataModel

Otherwise I can't see how variables (integer, long) are relevant to the problem.
                
> Better key splitting in RegionSplitter
> --------------------------------------
>
>                 Key: HBASE-4489
>                 URL: https://issues.apache.org/jira/browse/HBASE-4489
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.4
>            Reporter: Dave Revell
>            Assignee: Dave Revell
>         Attachments: HBASE-4489-branch0.90-v1.patch, HBASE-4489-branch0.90-v2.patch,
HBASE-4489-branch0.90-v3.patch, HBASE-4489-trunk-v1.patch, HBASE-4489-trunk-v2.patch, HBASE-4489-trunk-v3.patch
>
>
> The RegionSplitter utility allows users to create a pre-split table from the command
line or do a rolling split on an existing table. It supports pluggable split algorithms that
implement the SplitAlgorithm interface. The only/default SplitAlgorithm is one that assumes
keys fall in the range from ASCII string "00000000" to ASCII string "7FFFFFFF". This is not
a sane default, and seems useless to most users. Users are likely to be surprised by the fact
that all the region splits occur in in the byte range of ASCII characters.
> A better default split algorithm would be one that evenly divides the space of all bytes,
which is what this patch does. Making a table with five regions would split at \x33\x33...,
\x66\x66...., \x99\x99..., \xCC\xCC..., and \xFF\xFF.

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