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Currently we only have the one event format version defined, but this
adds the necessary infrastructure to persist and fetch the format
versions alongside the events.
We specify the format version rather than the room version as:
1. We don't necessarily know the room version, existing events may be
either v1 or v2.
2. We'd need to be careful to prevent/handle correctly if different
events in the same room reported to be of different versions, which
sounds annoying.
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Since we're about to look up the events themselves anyway, we can skip the
extra db queries here.
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This fixes #3518, and ensures that we get useful logs and metrics for lots of
things that happen in the background.
(There are certainly more things that happen in the background; these are just
the common ones I've found running a single-process synapse locally).
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Let's try to include time spent in the DB threads in the per-request/block cpu
usage metrics.
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add a Measure block on _fetch_event_list, in the hope that we can better
measure CPU usage here.
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Log number of events fetched from DB
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so that we can stub it for the sentinel and not have a billion failing UTs
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When we finish processing a request, log the number of events we fetched from
the database to handle it.
[I'm trying to figure out which requests are responsible for large amounts of
event cache churn. It may turn out to be more helpful to add counts to the
prometheus per-request/block metrics, but that is an extension to this code
anyway.]
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Signed-off-by: Adrian Tschira <nota@notafile.com>
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While I was going through uses of preserve_fn for other PRs, I converted places
which only use the wrapped function once to use run_in_background, to avoid
creating the function object.
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