diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 7eb342674c..49abf0ac74 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -307,6 +307,9 @@ class StateStore(SQLBaseStore):
def _get_state_groups_from_groups_txn(self, txn, groups, types=None):
results = {group: {} for group in groups}
+ if types is not None:
+ types = list(set(types)) # deduplicate types list
+
if isinstance(self.database_engine, PostgresEngine):
# Temporarily disable sequential scans in this transaction. This is
# a temporary hack until we can add the right indices in
@@ -375,10 +378,35 @@ class StateStore(SQLBaseStore):
# We don't use WITH RECURSIVE on sqlite3 as there are distributions
# that ship with an sqlite3 version that doesn't support it (e.g. wheezy)
for group in groups:
- group_tree = [group]
next_group = group
while next_group:
+ # We did this before by getting the list of group ids, and
+ # then passing that list to sqlite to get latest event for
+ # each (type, state_key). However, that was terribly slow
+ # without the right indicies (which we can't add until
+ # after we finish deduping state, which requires this func)
+ args = [next_group]
+ if types:
+ args.extend(i for typ in types for i in typ)
+
+ txn.execute(
+ "SELECT type, state_key, event_id FROM state_groups_state"
+ " WHERE state_group = ? %s" % (where_clause,),
+ args
+ )
+ rows = txn.fetchall()
+ results[group].update({
+ (typ, state_key): event_id
+ for typ, state_key, event_id in rows
+ if (typ, state_key) not in results[group]
+ })
+
+ # If the lengths match then we must have all the types,
+ # so no need to go walk further down the tree.
+ if types is not None and len(results[group]) == len(types):
+ break
+
next_group = self._simple_select_one_onecol_txn(
txn,
table="state_group_edges",
@@ -386,28 +414,6 @@ class StateStore(SQLBaseStore):
retcol="prev_state_group",
allow_none=True,
)
- if next_group:
- group_tree.append(next_group)
-
- sql = ("""
- SELECT type, state_key, event_id FROM state_groups_state
- INNER JOIN (
- SELECT type, state_key, max(state_group) as state_group
- FROM state_groups_state
- WHERE state_group IN (%s) %s
- GROUP BY type, state_key
- ) USING (type, state_key, state_group);
- """) % (",".join("?" for _ in group_tree), where_clause,)
-
- args = list(group_tree)
- if types is not None:
- args.extend([i for typ in types for i in typ])
-
- txn.execute(sql, args)
- rows = self.cursor_to_dict(txn)
- for row in rows:
- key = (row["type"], row["state_key"])
- results[group][key] = row["event_id"]
return results
|
