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Merge pull request #906 from matrix-org/markjh/faster_events_around

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Use a query that postgresql optimises better for get_events_around
This commit is contained in:
Mark Haines 2016-07-05 14:48:34 +01:00 committed by GitHub
commit 04dee11e97
2 changed files with 102 additions and 60 deletions
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18
synapse/storage/event_push_actions.py
View file

@ -16,6 +16,8 @@
from ._base import SQLBaseStore
from twisted.internet import defer
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.types import RoomStreamToken
from .stream import lower_bound
import logging
import ujson as json
@ -73,6 +75,9 @@ class EventPushActionsStore(SQLBaseStore):
stream_ordering = results[0][0]
topological_ordering = results[0][1]
token = RoomStreamToken(
topological_ordering, stream_ordering
)
sql = (
"SELECT sum(notif), sum(highlight)"
@ -80,15 +85,10 @@ class EventPushActionsStore(SQLBaseStore):
" WHERE"
" user_id = ?"
" AND room_id = ?"
" AND ("
" topological_ordering > ?"
" OR (topological_ordering = ? AND stream_ordering > ?)"
")"
)
txn.execute(sql, (
user_id, room_id,
topological_ordering, topological_ordering, stream_ordering
))
" AND %s"
) % (lower_bound(token, self.database_engine, inclusive=False),)
txn.execute(sql, (user_id, room_id))
row = txn.fetchone()
if row:
return {

144
synapse/storage/stream.py
View file

@ -40,6 +40,7 @@ from synapse.util.caches.descriptors import cached
from synapse.api.constants import EventTypes
from synapse.types import RoomStreamToken
from synapse.util.logcontext import preserve_fn
from synapse.storage.engines import PostgresEngine, Sqlite3Engine
import logging
@ -54,25 +55,43 @@ _STREAM_TOKEN = "stream"
_TOPOLOGICAL_TOKEN = "topological"
def lower_bound(token):
def lower_bound(token, engine, inclusive=False):
inclusive = "=" if inclusive else ""
if token.topological is None:
return "(%d < %s)" % (token.stream, "stream_ordering")
return "(%d <%s %s)" % (token.stream, inclusive, "stream_ordering")
else:
return "(%d < %s OR (%d = %s AND %d < %s))" % (
if isinstance(engine, PostgresEngine):
# Postgres doesn't optimise ``(x < a) OR (x=a AND y<b)`` as well
# as it optimises ``(x,y) < (a,b)`` on multicolumn indexes. So we
# use the later form when running against postgres.
return "((%d,%d) <%s (%s,%s))" % (
token.topological, token.stream, inclusive,
"topological_ordering", "stream_ordering",
)
return "(%d < %s OR (%d = %s AND %d <%s %s))" % (
token.topological, "topological_ordering",
token.topological, "topological_ordering",
token.stream, "stream_ordering",
token.stream, inclusive, "stream_ordering",
)
def upper_bound(token):
def upper_bound(token, engine, inclusive=True):
inclusive = "=" if inclusive else ""
if token.topological is None:
return "(%d >= %s)" % (token.stream, "stream_ordering")
return "(%d >%s %s)" % (token.stream, inclusive, "stream_ordering")
else:
return "(%d > %s OR (%d = %s AND %d >= %s))" % (
if isinstance(engine, PostgresEngine):
# Postgres doesn't optimise ``(x > a) OR (x=a AND y>b)`` as well
# as it optimises ``(x,y) > (a,b)`` on multicolumn indexes. So we
# use the later form when running against postgres.
return "((%d,%d) >%s (%s,%s))" % (
token.topological, token.stream, inclusive,
"topological_ordering", "stream_ordering",
)
return "(%d > %s OR (%d = %s AND %d >%s %s))" % (
token.topological, "topological_ordering",
token.topological, "topological_ordering",
token.stream, "stream_ordering",
token.stream, inclusive, "stream_ordering",
)
@ -308,18 +327,22 @@ class StreamStore(SQLBaseStore):
args = [False, room_id]
if direction == 'b':
order = "DESC"
bounds = upper_bound(RoomStreamToken.parse(from_key))
bounds = upper_bound(
RoomStreamToken.parse(from_key), self.database_engine
)
if to_key:
bounds = "%s AND %s" % (
bounds, lower_bound(RoomStreamToken.parse(to_key))
)
bounds = "%s AND %s" % (bounds, lower_bound(
RoomStreamToken.parse(to_key), self.database_engine
))
else:
order = "ASC"
bounds = lower_bound(RoomStreamToken.parse(from_key))
bounds = lower_bound(
RoomStreamToken.parse(from_key), self.database_engine
)
if to_key:
bounds = "%s AND %s" % (
bounds, upper_bound(RoomStreamToken.parse(to_key))
)
bounds = "%s AND %s" % (bounds, upper_bound(
RoomStreamToken.parse(to_key), self.database_engine
))
if int(limit) > 0:
args.append(int(limit))
@ -586,32 +609,60 @@ class StreamStore(SQLBaseStore):
retcols=["stream_ordering", "topological_ordering"],
)
stream_ordering = results["stream_ordering"]
topological_ordering = results["topological_ordering"]
query_before = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND (topological_ordering < ?"
" OR (topological_ordering = ? AND stream_ordering < ?))"
" ORDER BY topological_ordering DESC, stream_ordering DESC"
" LIMIT ?"
token = RoomStreamToken(
results["topological_ordering"],
results["stream_ordering"],
)
query_after = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND (topological_ordering > ?"
" OR (topological_ordering = ? AND stream_ordering > ?))"
" ORDER BY topological_ordering ASC, stream_ordering ASC"
" LIMIT ?"
)
if isinstance(self.database_engine, Sqlite3Engine):
# SQLite3 doesn't optimise ``(x < a) OR (x = a AND y < b)``
# So we give pass it to SQLite3 as the UNION ALL of the two queries.
txn.execute(
query_before,
(
room_id, topological_ordering, topological_ordering,
stream_ordering, before_limit,
query_before = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND topological_ordering < ?"
" UNION ALL"
" SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND topological_ordering = ? AND stream_ordering < ?"
" ORDER BY topological_ordering DESC, stream_ordering DESC LIMIT ?"
)
)
before_args = (
room_id, token.topological,
room_id, token.topological, token.stream,
before_limit,
)
query_after = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND topological_ordering > ?"
" UNION ALL"
" SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND topological_ordering = ? AND stream_ordering > ?"
" ORDER BY topological_ordering ASC, stream_ordering ASC LIMIT ?"
)
after_args = (
room_id, token.topological,
room_id, token.topological, token.stream,
after_limit,
)
else:
query_before = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND %s"
" ORDER BY topological_ordering DESC, stream_ordering DESC LIMIT ?"
) % (upper_bound(token, self.database_engine, inclusive=False),)
before_args = (room_id, before_limit)
query_after = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" WHERE room_id = ? AND %s"
" ORDER BY topological_ordering ASC, stream_ordering ASC LIMIT ?"
) % (lower_bound(token, self.database_engine, inclusive=False),)
after_args = (room_id, after_limit)
txn.execute(query_before, before_args)
rows = self.cursor_to_dict(txn)
events_before = [r["event_id"] for r in rows]
@ -623,17 +674,11 @@ class StreamStore(SQLBaseStore):
))
else:
start_token = str(RoomStreamToken(
topological_ordering,
stream_ordering - 1,
token.topological,
token.stream - 1,
))
txn.execute(
query_after,
(
room_id, topological_ordering, topological_ordering,
stream_ordering, after_limit,
)
)
txn.execute(query_after, after_args)
rows = self.cursor_to_dict(txn)
events_after = [r["event_id"] for r in rows]
@ -644,10 +689,7 @@ class StreamStore(SQLBaseStore):
rows[-1]["stream_ordering"],
))
else:
end_token = str(RoomStreamToken(
topological_ordering,
stream_ordering,
))
end_token = str(token)
return {
"before": {