stack created HBASE-18848:
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Summary: meta region loading reporter
Key: HBASE-18848
URL: https://issues.apache.org/jira/browse/HBASE-18848
Project: HBase
Issue Type: Bug
Reporter: stack
We need reporting on meta table accesses.
In quiet a few cases, it is said that our client -- I can believe it -- does
too many lookups against meta.
In another case, we found that the hbase canary was ddos'ing the meta table but
it took a bunch of messing digging in rpc TRACE to figure out this was the case.
A few users at scale are fingering meta ops as the bound to their being able to
scale more (especially if their readers are hosted in MR and startup is a big
bang burst of meta scanning)
The report would dump numbers on clients, incidence and type of queries. It
would highlight bad actors and pathological behaviors.
This is a particular instance of what a general trace system might provide but
we don't have that yet. This could be a good first exercise implementing a
trace or it might just use trace engine mechanics to realize a few dump jsps.
Whatever, we need some tooling for operators.
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