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https://issues.apache.org/jira/browse/HBASE-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dave Revell updated HBASE-4489:
-------------------------------
Release Note: The split algorithm used by RegionSplitter is now a required
parameter. Previously there was one split algorithm called MD5StringSplit,
which was the default. MD5StringSplit has been renamed to HexStringSplit, and
tweaked so that its maximum key is now "FFFFFFFF" instead of "7FFFFFFF. A new
split algorithm UniformSplit has been added which treats keys as arbitrary
bytes.
> 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
> Fix For: 0.90.5
>
> 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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