Better key splitting in RegionSplitter
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Key: HBASE-4489
URL: https://issues.apache.org/jira/browse/HBASE-4489
Project: HBase
Issue Type: Improvement
Reporter: Dave Revell
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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