Add compaction details to master UI
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Key: HBASE-2021
URL: https://issues.apache.org/jira/browse/HBASE-2021
Project: Hadoop HBase
Issue Type: Improvement
Reporter: Lars George
Assignee: Lars George
Priority: Minor
There are two issues with this, first to detect that there is a compaction
needed. You can currently use the little helper util that checks if a table has
at least one colfam with more than one store file. I though about scanning all
tables and all colfams in each and then compute the "fragmentation" ratio as a
percentage of colfams with more than one store to the total number of colfams.
That gives a "Table xyz is 33% fragmented" output. While minor percentage are
normal under insert operations it is still important to know how bad the
fragmentation is overall.
Another idea is to weigh the number of files per store too, so that if you have
two per colfam it is considered "low" and if you have more, for example 6-8 it
is considered "high". Not sure how that can be done yet but noting the idea
down here.
Of course seeing the .META. fragmentation is useful to quickly debug
performance issues (as JD told me on IRC).
The other issue is that when you have started a compaction you have no idea how
far it is and if it is still in progress. One indication of course is the above
value. If it is 0% then all is done. But if you are at say 23%, is it still
compacting? We could have a simple status that compactions are still in
progress.
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