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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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108
synapse/storage/state.py
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@ -172,7 +172,7 @@ class StateStore(SQLBaseStore):
defer.returnValue(events) defer.returnValue(events)
def _get_state_groups_from_groups(self, groups, types): 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): def f(txn, groups):
if types is not None: if types is not None:
@ -183,7 +183,8 @@ class StateStore(SQLBaseStore):
where_clause = "" where_clause = ""
sql = ( 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" % ( " state_group IN (%s) %s" % (
",".join("?" for _ in groups), ",".join("?" for _ in groups),
where_clause, where_clause,
@ -199,7 +200,8 @@ class StateStore(SQLBaseStore):
results = {} results = {}
for row in rows: 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 return results
chunks = [groups[i:i + 100] for i in xrange(0, len(groups), 100)] 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 where a `state_key` of `None` matches all state_keys for the
`type`. `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 = {} type_to_key = {}
missing_types = set() missing_types = set()
@ -308,7 +310,7 @@ class StateStore(SQLBaseStore):
if type_to_key.get(typ, object()) is not None: if type_to_key.get(typ, object()) is not None:
type_to_key.setdefault(typ, set()).add(state_key) 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)) missing_types.add((typ, state_key))
sentinel = object() sentinel = object()
@ -326,7 +328,7 @@ class StateStore(SQLBaseStore):
got_all = not (missing_types or types is None) got_all = not (missing_types or types is None)
return { 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]) if include(k[0], k[1])
}, missing_types, got_all }, missing_types, got_all
@ -340,8 +342,9 @@ class StateStore(SQLBaseStore):
Args: Args:
group: The state group to lookup group: The state group to lookup
""" """
is_all, state_dict = self._state_group_cache.get(group) is_all, state_dict_ids = self._state_group_cache.get(group)
return state_dict, is_all
return state_dict_ids, is_all
@defer.inlineCallbacks @defer.inlineCallbacks
def _get_state_for_groups(self, groups, types=None): def _get_state_for_groups(self, groups, types=None):
@ -354,84 +357,69 @@ class StateStore(SQLBaseStore):
missing_groups = [] missing_groups = []
if types is not None: if types is not None:
for group in set(groups): 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 group, types
) )
results[group] = state_dict results[group] = state_dict_ids
if not got_all: if not got_all:
missing_groups.append(group) missing_groups.append(group)
else: else:
for group in set(groups): 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 group
) )
results[group] = state_dict
results[group] = state_dict_ids
if not got_all: if not got_all:
missing_groups.append(group) missing_groups.append(group)
if not missing_groups: if missing_groups:
defer.returnValue({ # Okay, so we have some missing_types, lets fetch them.
group: { cache_seq_num = self._state_group_cache.sequence
type_tuple: event
for type_tuple, event in state.items()
if event
}
for group, state in results.items()
})
# Okay, so we have some missing_types, lets fetch them. group_to_state_dict = yield self._get_state_groups_from_groups(
cache_seq_num = self._state_group_cache.sequence missing_groups, types
)
group_state_dict = yield self._get_state_groups_from_groups( # Now we want to update the cache with all the things we fetched
missing_groups, types # from the database.
) 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
# explicitly asked for some types then we will probably ask
# for them again.
state_dict = {key: None for key in types}
state_dict.update(results[group])
results[group] = state_dict
else:
state_dict = results[group]
state_dict.update(group_state_dict)
self._state_group_cache.update(
cache_seq_num,
key=group,
value=state_dict,
full=(types is None),
)
state_events = yield self._get_events( state_events = yield self._get_events(
[e_id for l in group_state_dict.values() for e_id in l], [ev_id for sd in results.values() for ev_id in sd.values()],
get_prev_content=False get_prev_content=False
) )
state_events = {e.event_id: e for e in state_events} 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():
if types:
# We delibrately put key -> None mappings into the cache to
# cache absence of the key, on the assumption that if we've
# explicitly asked for some types then we will probably ask
# for them again.
state_dict = {key: None for key in types}
state_dict.update(results[group])
results[group] = state_dict
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,
)
self._state_group_cache.update(
cache_seq_num,
key=group,
value=state_dict,
full=(types is None),
)
# Remove all the entries with None values. The None values were just # Remove all the entries with None values. The None values were just
# used for bookkeeping in the cache. # used for bookkeeping in the cache.
for group, state_dict in results.items(): for group, state_dict in results.items():
results[group] = { 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) defer.returnValue(results)