Merge pull request #5476 from matrix-org/erikj/histogram_extremities

Add metrics for length of new extremities persisted.
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Erik Johnston 2019-06-21 09:58:54 +01:00 committed by GitHub
commit 7456698241
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3 changed files with 37 additions and 1 deletions

1
changelog.d/5476.misc Normal file
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@ -0,0 +1 @@
Add new metrics for number of forward extremities being persisted and number of state groups involved in resolution.

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@ -21,6 +21,7 @@ from six import iteritems, itervalues
import attr
from frozendict import frozendict
from prometheus_client import Histogram
from twisted.internet import defer
@ -37,6 +38,14 @@ from synapse.util.metrics import Measure
logger = logging.getLogger(__name__)
# Metrics for number of state groups involved in a resolution.
state_groups_histogram = Histogram(
"synapse_state_number_state_groups_in_resolution",
"Number of state groups used when performing a state resolution",
buckets=(1, 2, 3, 5, 7, 10, 15, 20, 50, 100, 200, 500, "+Inf"),
)
KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
@ -476,6 +485,8 @@ class StateResolutionHandler(object):
"Resolving state for %s with %d groups", room_id, len(state_groups_ids)
)
state_groups_histogram.observe(len(state_groups_ids))
# start by assuming we won't have any conflicted state, and build up the new
# state map by iterating through the state groups. If we discover a conflict,
# we give up and instead use `resolve_events_with_store`.

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@ -24,7 +24,7 @@ from six import iteritems, text_type
from six.moves import range
from canonicaljson import json
from prometheus_client import Counter
from prometheus_client import Counter, Histogram
from twisted.internet import defer
@ -74,6 +74,21 @@ state_delta_reuse_delta_counter = Counter(
"synapse_storage_events_state_delta_reuse_delta", ""
)
# The number of forward extremities for each new event.
forward_extremities_counter = Histogram(
"synapse_storage_events_forward_extremities_persisted",
"Number of forward extremities for each new event",
buckets=(1, 2, 3, 5, 7, 10, 15, 20, 50, 100, 200, 500, "+Inf"),
)
# The number of stale forward extremities for each new event. Stale extremities
# are those that were in the previous set of extremities as well as the new.
stale_forward_extremities_counter = Histogram(
"synapse_storage_events_stale_forward_extremities_persisted",
"Number of unchanged forward extremities for each new event",
buckets=(0, 1, 2, 3, 5, 7, 10, 15, 20, 50, 100, 200, 500, "+Inf"),
)
def encode_json(json_object):
"""
@ -541,6 +556,8 @@ class EventsStore(
and not event.internal_metadata.is_soft_failed()
]
latest_event_ids = set(latest_event_ids)
# start with the existing forward extremities
result = set(latest_event_ids)
@ -564,6 +581,13 @@ class EventsStore(
)
result.difference_update(existing_prevs)
# We only update metrics for events that change forward extremities
# (e.g. we ignore backfill/outliers/etc)
if result != latest_event_ids:
forward_extremities_counter.observe(len(result))
stale = latest_event_ids & result
stale_forward_extremities_counter.observe(len(stale))
defer.returnValue(result)
@defer.inlineCallbacks