Gabriel Reid created PHOENIX-2692:
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Summary: Provide flag for disabling statistics collection
Key: PHOENIX-2692
URL: https://issues.apache.org/jira/browse/PHOENIX-2692
Project: Phoenix
Issue Type: New Feature
Reporter: Gabriel Reid
It would be useful to be able to completely disable statistics collection in
some situations. This is typically done for debugging performance issues that
have come up as part of statistics collection.
Disabling statistics collection is typically done by setting the
{{phoenix.stats.guidepost.width}} config setting to a very large number, but
this has the problem that it is not 100% reliable (some guidepost data is still
written to the SYSTEM.STATS table if this is done), and it's just kind of a
work-around that currently (mostly) works, but this method of disabling stats
collection isn't guaranteed to work in the future (for example, if new types of
statistics are also collected, or if they're based on something other than file
size).
Our specific use case for disabling statistics collection is based on the way
that we're typically using Phoenix, which is more as a library which
facilitates querying a combination of data that is managed by Phoenix along
with data that is not managed by Phoenix. In this case, because the statistics
collection only looks at the data managed by Phoenix, it doesn't function as
needed (as well as having the additional issue of leading to problems like
LP-2680).
Ideally we'll move towards using statistics as we iron out these issues, but
having the ability to disable statistics (at least for now) would also be very
useful.
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