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Don't cache events in _state_group_cache

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Instead, simply cache the event ids, relying on the event cache to cache
the actual events.

The problem was that while the state groups cache was limited in the
number of groups it could hold, each individual group could consist of
thousands of events.
This commit is contained in:
Erik Johnston 2016-03-22 11:59:31 +00:00
parent 63137bb901
commit 2c86187a1b
1 changed files with 48 additions and 60 deletions
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72
synapse/storage/state.py
View file

@ -172,7 +172,7 @@ class StateStore(SQLBaseStore):
defer.returnValue(events)
def _get_state_groups_from_groups(self, groups, types):
"""Returns dictionary state_group -> state event ids
"""Returns dictionary state_group -> (dict of (type, state_key) -> event id)
"""
def f(txn, groups):
if types is not None:
@ -183,7 +183,8 @@ class StateStore(SQLBaseStore):
where_clause = ""
sql = (
"SELECT state_group, event_id FROM state_groups_state WHERE"
"SELECT state_group, event_id, type, state_key"
" FROM state_groups_state WHERE"
" state_group IN (%s) %s" % (
",".join("?" for _ in groups),
where_clause,
@ -199,7 +200,8 @@ class StateStore(SQLBaseStore):
results = {}
for row in rows:
results.setdefault(row["state_group"], []).append(row["event_id"])
key = (row["type"], row["state_key"])
results.setdefault(row["state_group"], {})[key] = row["event_id"]
return results
chunks = [groups[i:i + 100] for i in xrange(0, len(groups), 100)]
@ -296,7 +298,7 @@ class StateStore(SQLBaseStore):
where a `state_key` of `None` matches all state_keys for the
`type`.
"""
is_all, state_dict = self._state_group_cache.get(group)
is_all, state_dict_ids = self._state_group_cache.get(group)
type_to_key = {}
missing_types = set()
@ -308,7 +310,7 @@ class StateStore(SQLBaseStore):
if type_to_key.get(typ, object()) is not None:
type_to_key.setdefault(typ, set()).add(state_key)
if (typ, state_key) not in state_dict:
if (typ, state_key) not in state_dict_ids:
missing_types.add((typ, state_key))
sentinel = object()
@ -326,7 +328,7 @@ class StateStore(SQLBaseStore):
got_all = not (missing_types or types is None)
return {
k: v for k, v in state_dict.items()
k: v for k, v in state_dict_ids.items()
if include(k[0], k[1])
}, missing_types, got_all
@ -340,8 +342,9 @@ class StateStore(SQLBaseStore):
Args:
group: The state group to lookup
"""
is_all, state_dict = self._state_group_cache.get(group)
return state_dict, is_all
is_all, state_dict_ids = self._state_group_cache.get(group)
return state_dict_ids, is_all
@defer.inlineCallbacks
def _get_state_for_groups(self, groups, types=None):
@ -354,50 +357,35 @@ class StateStore(SQLBaseStore):
missing_groups = []
if types is not None:
for group in set(groups):
state_dict, missing_types, got_all = self._get_some_state_from_cache(
state_dict_ids, missing_types, got_all = self._get_some_state_from_cache(
group, types
)
results[group] = state_dict
results[group] = state_dict_ids
if not got_all:
missing_groups.append(group)
else:
for group in set(groups):
state_dict, got_all = self._get_all_state_from_cache(
state_dict_ids, got_all = self._get_all_state_from_cache(
group
)
results[group] = state_dict
results[group] = state_dict_ids
if not got_all:
missing_groups.append(group)
if not missing_groups:
defer.returnValue({
group: {
type_tuple: event
for type_tuple, event in state.items()
if event
}
for group, state in results.items()
})
if missing_groups:
# Okay, so we have some missing_types, lets fetch them.
cache_seq_num = self._state_group_cache.sequence
group_state_dict = yield self._get_state_groups_from_groups(
group_to_state_dict = yield self._get_state_groups_from_groups(
missing_groups, types
)
state_events = yield self._get_events(
[e_id for l in group_state_dict.values() for e_id in l],
get_prev_content=False
)
state_events = {e.event_id: e for e in state_events}
# Now we want to update the cache with all the things we fetched
# from the database.
for group, state_ids in group_state_dict.items():
for group, group_state_dict in group_to_state_dict.items():
if types:
# We delibrately put key -> None mappings into the cache to
# cache absence of the key, on the assumption that if we've
@ -409,16 +397,7 @@ class StateStore(SQLBaseStore):
else:
state_dict = results[group]
for event_id in state_ids:
try:
state_event = state_events[event_id]
state_dict[(state_event.type, state_event.state_key)] = state_event
except KeyError:
# Hmm. So we do don't have that state event? Interesting.
logger.warn(
"Can't find state event %r for state group %r",
event_id, group,
)
state_dict.update(group_state_dict)
self._state_group_cache.update(
cache_seq_num,
@ -427,11 +406,20 @@ class StateStore(SQLBaseStore):
full=(types is None),
)
state_events = yield self._get_events(
[ev_id for sd in results.values() for ev_id in sd.values()],
get_prev_content=False
)
state_events = {e.event_id: e for e in state_events}
# Remove all the entries with None values. The None values were just
# used for bookkeeping in the cache.
for group, state_dict in results.items():
results[group] = {
key: event for key, event in state_dict.items() if event
key: state_events[event_id]
for key, event_id in state_dict.items()
if event_id and event_id in state_events
}
defer.returnValue(results)