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Date: Sat, 15 Oct 2011 03:02:12 +0000 (UTC)
From: "Dave Revell (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (HBASE-4489) Better key splitting in
 RegionSplitter
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     [ https://issues.apache.org/jira/browse/HBASE-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dave Revell updated HBASE-4489:
-------------------------------

    Attachment: HBASE-4489-trunk-v5.patch

Nicolas, agreed. New patch for trunk (v5) attached that incorporates your feedback.

The v3 patch is still the most current patch for 0.90.
                
> 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, HBASE-4489-trunk-v4.patch, HBASE-4489-trunk-v5.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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