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Add counter metrics for calculating state delta

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This will allow us to measure how often we calculate state deltas in
event persistence that we would have been able to calculate at the same
time we calculated the state for the event.
This commit is contained in:
Erik Johnston 2018-03-27 10:30:03 +01:00
parent 8efe773ef1
commit 3f49e131d9
1 changed files with 30 additions and 1 deletions
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31
synapse/storage/events.py
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@ -52,6 +52,15 @@ persist_event_counter = metrics.register_counter("persisted_events")
event_counter = metrics.register_counter( event_counter = metrics.register_counter(
"persisted_events_sep", labels=["type", "origin_type", "origin_entity"] "persisted_events_sep", labels=["type", "origin_type", "origin_entity"]
) )
state_delta_counter = metrics.register_counter(
"state_delta",
)
state_delta_single_event_counter = metrics.register_counter(
"state_delta_single_event",
)
state_delta_reuse_delta_counter = metrics.register_counter(
"state_delta_reuse_delta",
)
def encode_json(json_object): def encode_json(json_object):
@ -368,7 +377,8 @@ class EventsStore(EventsWorkerStore):
room_id, ev_ctx_rm, latest_event_ids 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 # No change in extremities, so no change in state
continue continue
@ -389,6 +399,25 @@ class EventsStore(EventsWorkerStore):
if all_single_prev_not_state: if all_single_prev_not_state:
continue 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. We guess this by looking at the prev events and
# checking if they match up, as when this server creates
# a new event it will use the extremities as the prev
# events.
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( logger.info(
"Calculating state delta for room %s", room_id, "Calculating state delta for room %s", room_id,
) )