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Awful idea for speeding up fetching of events

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This commit is contained in:
Erik Johnston 2015-05-14 15:34:02 +01:00
parent 7f4105a5c9
commit 7cd6a6f6cf
3 changed files with 139 additions and 40 deletions
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4
synapse/storage/_base.py
View file

@ -299,6 +299,10 @@ class SQLBaseStore(object):
self._get_event_cache = Cache("*getEvent*", keylen=3, lru=True,
max_entries=hs.config.event_cache_size)
self._event_fetch_lock = threading.Lock()
self._event_fetch_list = []
self._event_fetch_ongoing = False
self.database_engine = hs.database_engine
self._stream_id_gen = StreamIdGenerator()

149
synapse/storage/events.py
View file

@ -15,7 +15,7 @@
from _base import SQLBaseStore, _RollbackButIsFineException
from twisted.internet import defer
from twisted.internet import defer, reactor
from synapse.events import FrozenEvent
from synapse.events.utils import prune_event
@ -89,18 +89,17 @@ class EventsStore(SQLBaseStore):
Returns:
Deferred : A FrozenEvent.
"""
event = yield self.runInteraction(
"get_event", self._get_event_txn,
event_id,
check_redacted=check_redacted,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
events = yield self._get_events(
[event_id],
check_redacted=True,
get_prev_content=False,
allow_rejected=False,
)
if not event and not allow_none:
if not events and not allow_none:
raise RuntimeError("Could not find event %s" % (event_id,))
defer.returnValue(event)
defer.returnValue(events[0] if events else None)
@log_function
def _persist_event_txn(self, txn, event, context, backfilled,
@ -420,7 +419,15 @@ class EventsStore(SQLBaseStore):
if e_id in event_map and event_map[e_id]
])
missing_events = yield self._fetch_events(
if not txn:
missing_events = yield self._enqueue_events(
missing_events_ids,
check_redacted=check_redacted,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
)
else:
missing_events = self._fetch_events_txn(
txn,
missing_events_ids,
check_redacted=check_redacted,
@ -492,11 +499,82 @@ class EventsStore(SQLBaseStore):
))
@defer.inlineCallbacks
def _fetch_events(self, txn, events, check_redacted=True,
def _enqueue_events(self, events, check_redacted=True,
get_prev_content=False, allow_rejected=False):
if not events:
defer.returnValue({})
def do_fetch(txn):
event_list = []
try:
with self._event_fetch_lock:
event_list = self._event_fetch_list
self._event_fetch_list = []
if not event_list:
return
event_id_lists = zip(*event_list)[0]
event_ids = [
item for sublist in event_id_lists for item in sublist
]
rows = self._fetch_event_rows(txn, event_ids)
row_dict = {
r["event_id"]: r
for r in rows
}
for ids, d in event_list:
d.callback(
[
row_dict[i] for i in ids
if i in row_dict
]
)
except Exception as e:
for _, d in event_list:
try:
reactor.callFromThread(d.errback, e)
except:
pass
finally:
with self._event_fetch_lock:
self._event_fetch_ongoing = False
def cb(rows):
return defer.gatherResults([
self._get_event_from_row(
None,
row["internal_metadata"], row["json"], row["redacts"],
check_redacted=check_redacted,
get_prev_content=get_prev_content,
rejected_reason=row["rejects"],
)
for row in rows
])
d = defer.Deferred()
d.addCallback(cb)
with self._event_fetch_lock:
self._event_fetch_list.append(
(events, d)
)
if not self._event_fetch_ongoing:
self.runInteraction(
"do_fetch",
do_fetch
)
res = yield d
defer.returnValue({
e.event_id: e
for e in res if e
})
def _fetch_event_rows(self, txn, events):
rows = []
N = 200
for i in range(1 + len(events) / N):
@ -505,43 +583,56 @@ class EventsStore(SQLBaseStore):
break
sql = (
"SELECT e.internal_metadata, e.json, r.redacts, rej.event_id "
"SELECT "
" e.event_id as event_id, "
" e.internal_metadata,"
" e.json,"
" r.redacts as redacts,"
" rej.event_id as rejects "
" FROM event_json as e"
" LEFT JOIN rejections as rej USING (event_id)"
" LEFT JOIN redactions as r ON e.event_id = r.redacts"
" WHERE e.event_id IN (%s)"
) % (",".join(["?"]*len(evs)),)
if txn:
txn.execute(sql, evs)
rows.extend(txn.fetchall())
rows.extend(self.cursor_to_dict(txn))
return rows
@defer.inlineCallbacks
def _fetch_events(self, txn, events, check_redacted=True,
get_prev_content=False, allow_rejected=False):
if not events:
defer.returnValue({})
if txn:
rows = self._fetch_event_rows(
txn, events,
)
else:
res = yield self._execute("_fetch_events", None, sql, *evs)
rows.extend(res)
rows = yield self.runInteraction(
self._fetch_event_rows,
events,
)
res = yield defer.gatherResults(
[
defer.maybeDeferred(
self._get_event_from_row,
txn,
row[0], row[1], row[2],
row["internal_metadata"], row["json"], row["redacts"],
check_redacted=check_redacted,
get_prev_content=get_prev_content,
rejected_reason=row[3],
rejected_reason=row["rejects"],
)
for row in rows
],
consumeErrors=True,
)
for e in res:
self._get_event_cache.prefill(
e.event_id, check_redacted, get_prev_content, e
]
)
defer.returnValue({
e.event_id: e
for e in res if e
r.event_id: r
for r in res
})
@defer.inlineCallbacks
@ -611,6 +702,10 @@ class EventsStore(SQLBaseStore):
if prev:
ev.unsigned["prev_content"] = prev.get_dict()["content"]
self._get_event_cache.prefill(
ev.event_id, check_redacted, get_prev_content, ev
)
defer.returnValue(ev)
def _parse_events(self, rows):

8
synapse/util/__init__.py
View file

@ -80,16 +80,16 @@ class Clock(object):
def stop_looping_call(self, loop):
loop.stop()
def call_later(self, delay, callback):
def call_later(self, delay, callback, *args, **kwargs):
current_context = LoggingContext.current_context()
def wrapped_callback():
def wrapped_callback(*args, **kwargs):
with PreserveLoggingContext():
LoggingContext.thread_local.current_context = current_context
callback()
callback(*args, **kwargs)
with PreserveLoggingContext():
return reactor.callLater(delay, wrapped_callback)
return reactor.callLater(delay, wrapped_callback, *args, **kwargs)
def cancel_call_later(self, timer):
timer.cancel()