Merge pull request #3584 from matrix-org/erikj/use_cached

Only get cached state from context in persist_event
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Erik Johnston 2018-07-23 17:52:45 +01:00 committed by GitHub
commit f559119de0
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3 changed files with 21 additions and 1 deletions

1
changelog.d/3584.misc Normal file
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@ -0,0 +1 @@
Lazily load state on master process when using workers to reduce DB consumption

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@ -163,6 +163,9 @@ class EventContext(object):
context._prev_state_id = input["prev_state_id"]
context._event_type = input["event_type"]
context._event_state_key = input["event_state_key"]
context._current_state_ids = None
context._prev_state_ids = None
context._fetching_state_deferred = None
context.state_group = input["state_group"]
@ -214,6 +217,17 @@ class EventContext(object):
defer.returnValue(self._prev_state_ids)
def get_cached_current_state_ids(self):
"""Gets the current state IDs if we have them already cached.
Returns:
dict[(str, str), str]|None: Returns None if we haven't cached the
state or if state_group is None, which happens when the associated
event is an outlier.
"""
return self._current_state_ids
@defer.inlineCallbacks
def _fill_out_state(self, store):
"""Called to populate the _current_state_ids and _prev_state_ids

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@ -549,7 +549,12 @@ class EventsStore(EventsWorkerStore):
if ctx.state_group in state_groups_map:
continue
state_groups_map[ctx.state_group] = yield ctx.get_current_state_ids(self)
# We're only interested in pulling out state that has already
# been cached in the context. We'll pull stuff out of the DB later
# if necessary.
current_state_ids = ctx.get_cached_current_state_ids()
if current_state_ids is not None:
state_groups_map[ctx.state_group] = current_state_ids
# We need to map the event_ids to their state groups. First, let's
# check if the event is one we're persisting, in which case we can