Clint Heath created HBASE-10003:
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Summary: OnlineMerge should be extended to allow bulk merging
Key: HBASE-10003
URL: https://issues.apache.org/jira/browse/HBASE-10003
Project: HBase
Issue Type: Improvement
Components: Admin
Affects Versions: 0.94.6, 0.98.0
Reporter: Clint Heath
Now that we have Online Merge capabilities, the function of that tool should be
extended to make it much easier for HBase operations folks to use. Currently
it is a very manual process (one fraught with confusion) to hand pick two
regions that are contiguous to each other in the META table such that the admin
can manually request those two regions to be merged.
In the real world, when admins find themselves wanting to merge regions, it's
usually because they've greatly increased their hbase.hregion.max.filesize
property and they have way too many regions on a table and want to reduce the
region count for that entire table quickly and easily.
Why can't the OnlineMerge command just take a "-max" argument along with a
table name which tells it to go ahead and merge all regions of said table until
the resulting regions are all of max size? This takes the voodoo out of the
process and quickly gets the admin what they're looking for.
As part of this improvement, I also suggest a "-regioncount" argument for
OnlineMerge, which will attempt to reduce the table's region count down to the
specified #.
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