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Merge pull request #3033 from matrix-org/erikj/calculate_state_metrics

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Add counter metrics for calculating state delta
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Erik Johnston 2018-03-28 09:59:42 +01:00 committed by GitHub
commit 004cc8a328
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1 changed files with 38 additions and 1 deletions
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39
synapse/storage/events.py
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@ -53,6 +53,22 @@ event_counter = metrics.register_counter(
"persisted_events_sep", labels=["type", "origin_type", "origin_entity"]
)
# The number of times we are recalculating the current state
state_delta_counter = metrics.register_counter(
"state_delta",
)
# The number of times we are recalculating state when there is only a
# single forward extremity
state_delta_single_event_counter = metrics.register_counter(
"state_delta_single_event",
)
# The number of times we are reculating state when we could have resonably
# calculated the delta when we calculated the state for an event we were
# persisting.
state_delta_reuse_delta_counter = metrics.register_counter(
"state_delta_reuse_delta",
)
def encode_json(json_object):
if USE_FROZEN_DICTS:
@ -368,7 +384,8 @@ class EventsStore(EventsWorkerStore):
room_id, ev_ctx_rm, latest_event_ids
)
if new_latest_event_ids == set(latest_event_ids):
latest_event_ids = set(latest_event_ids)
if new_latest_event_ids == latest_event_ids:
# No change in extremities, so no change in state
continue
@ -389,6 +406,26 @@ class EventsStore(EventsWorkerStore):
if all_single_prev_not_state:
continue
state_delta_counter.inc()
if len(new_latest_event_ids) == 1:
state_delta_single_event_counter.inc()
# This is a fairly handwavey check to see if we could
# have guessed what the delta would have been when
# processing one of these events.
# What we're interested in is if the latest extremities
# were the same when we created the event as they are
# now. When this server creates a new event (as opposed
# to receiving it over federation) it will use the
# forward extremities as the prev_events, so we can
# guess this by looking at the prev_events and checking
# if they match the current forward extremities.
for ev, _ in ev_ctx_rm:
prev_event_ids = set(e for e, _ in ev.prev_events)
if latest_event_ids == prev_event_ids:
state_delta_reuse_delta_counter.inc()
break
logger.info(
"Calculating state delta for room %s", room_id,
)