Add another yield point to state res v2 (#7746)

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Erik Johnston 2020-06-26 10:44:52 +01:00 committed by GitHub
parent 177b2d0c19
commit 831b31e563
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2 changed files with 11 additions and 2 deletions

1
changelog.d/7746.bugfix Normal file
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@ -0,0 +1 @@
Fix large state resolutions from stalling Synapse for seconds at a time.

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@ -126,6 +126,7 @@ def resolve_events_with_store(
# Now sequentially auth each one
resolved_state = yield _iterative_auth_checks(
clock,
room_id,
room_version,
sorted_power_events,
@ -154,6 +155,7 @@ def resolve_events_with_store(
logger.debug("resolving remaining events")
resolved_state = yield _iterative_auth_checks(
clock,
room_id,
room_version,
leftover_events,
@ -378,12 +380,13 @@ def _reverse_topological_power_sort(
@defer.inlineCallbacks
def _iterative_auth_checks(
room_id, room_version, event_ids, base_state, event_map, state_res_store
clock, room_id, room_version, event_ids, base_state, event_map, state_res_store
):
"""Sequentially apply auth checks to each event in given list, updating the
state as it goes along.
Args:
clock (Clock)
room_id (str)
room_version (str)
event_ids (list[str]): Ordered list of events to apply auth checks to
@ -397,7 +400,7 @@ def _iterative_auth_checks(
resolved_state = base_state.copy()
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
for event_id in event_ids:
for idx, event_id in enumerate(event_ids, start=1):
event = event_map[event_id]
auth_events = {}
@ -435,6 +438,11 @@ def _iterative_auth_checks(
except AuthError:
pass
# We yield occasionally when we're working with large data sets to
# ensure that we don't block the reactor loop for too long.
if idx % _YIELD_AFTER_ITERATIONS == 0:
yield clock.sleep(0)
return resolved_state