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Code Issues Releases Wiki Activity

Implement cache replication stream

pull/1009/head
Erik Johnston 2016-08-15 11:16:45 +01:00
parent 4d70d1f80e
commit 64e7e11853
5 changed files with 92 additions and 30 deletions
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13
synapse/app/synchrotron.py
View File

@ -338,16 +338,10 @@ class SynchrotronServer(HomeServer):
http_client = self.get_simple_http_client()
store = self.get_datastore()
replication_url = self.config.worker_replication_url
clock = self.get_clock()
notifier = self.get_notifier()
presence_handler = self.get_presence_handler()
typing_handler = self.get_typing_handler()
def expire_broken_caches():
store.who_forgot_in_room.invalidate_all()
store.get_presence_list_accepted.invalidate_all()
store.get_presence_list_observers_accepted.invalidate_all()
def notify_from_stream(
result, stream_name, stream_key, room=None, user=None
):
@ -409,19 +403,12 @@ class SynchrotronServer(HomeServer):
result, "typing", "typing_key", room="room_id"
)
next_expire_broken_caches_ms = 0
while True:
try:
args = store.stream_positions()
args.update(typing_handler.stream_positions())
args["timeout"] = 30000
result = yield http_client.get_json(replication_url, args=args)
now_ms = clock.time_msec()
if now_ms > next_expire_broken_caches_ms:
expire_broken_caches()
next_expire_broken_caches_ms = (
now_ms + store.BROKEN_CACHE_EXPIRY_MS
)
yield store.process_replication(result)
typing_handler.process_replication(result)
yield presence_handler.process_replication(result)

21
synapse/replication/resource.py
View File

@ -41,6 +41,7 @@ STREAM_NAMES = (
("push_rules",),
("pushers",),
("state",),
("caches",),
)
@ -70,6 +71,7 @@ class ReplicationResource(Resource):
* "backfill": Old events that have been backfilled from other servers.
* "push_rules": Per user changes to push rules.
* "pushers": Per user changes to their pushers.
* "caches": Cache invalidations.
The API takes two additional query parameters:
@ -129,6 +131,7 @@ class ReplicationResource(Resource):
push_rules_token, room_stream_token = self.store.get_push_rules_stream_token()
pushers_token = self.store.get_pushers_stream_token()
state_token = self.store.get_state_stream_token()
caches_token = self.store.get_cache_stream_token()
defer.returnValue(_ReplicationToken(
room_stream_token,
@ -140,6 +143,7 @@ class ReplicationResource(Resource):
push_rules_token,
pushers_token,
state_token,
caches_token,
))
@request_handler()
@ -188,6 +192,7 @@ class ReplicationResource(Resource):
yield self.push_rules(writer, current_token, limit, request_streams)
yield self.pushers(writer, current_token, limit, request_streams)
yield self.state(writer, current_token, limit, request_streams)
yield self.caches(writer, current_token, limit, request_streams)
self.streams(writer, current_token, request_streams)
logger.info("Replicated %d rows", writer.total)
@ -379,6 +384,20 @@ class ReplicationResource(Resource):
"position", "type", "state_key", "event_id"
))
@defer.inlineCallbacks
def caches(self, writer, current_token, limit, request_streams):
current_position = current_token.caches
caches = request_streams.get("caches")
if caches is not None:
updated_caches = yield self.store.get_all_updated_caches(
caches, current_position, limit
)
writer.write_header_and_rows("caches", updated_caches, (
"position", "cache_func", "keys", "invalidation_ts"
))
class _Writer(object):
"""Writes the streams as a JSON object as the response to the request"""
@ -407,7 +426,7 @@ class _Writer(object):
class _ReplicationToken(collections.namedtuple("_ReplicationToken", (
"events", "presence", "typing", "receipts", "account_data", "backfill",
"push_rules", "pushers", "state"
"push_rules", "pushers", "state", "caches",
))):
__slots__ = []

30
synapse/replication/slave/storage/_base.py
View File

@ -14,15 +14,43 @@
# limitations under the License.
from synapse.storage._base import SQLBaseStore
from synapse.storage.engines import PostgresEngine
from twisted.internet import defer
from ._slaved_id_tracker import SlavedIdTracker
import logging
logger = logging.getLogger(__name__)
class BaseSlavedStore(SQLBaseStore):
def __init__(self, db_conn, hs):
super(BaseSlavedStore, self).__init__(hs)
if isinstance(self.database_engine, PostgresEngine):
self._cache_id_gen = SlavedIdTracker(
db_conn, "cache_stream", "stream_id",
)
else:
self._cache_id_gen = None
def stream_positions(self):
return {}
pos = {}
if self._cache_id_gen:
pos["caches"] = self._cache_id_gen.get_current_token()
return pos
def process_replication(self, result):
stream = result.get("caches")
if stream:
for row in stream["rows"]:
(
position, cache_func, keys, invalidation_ts,
) = row
try:
getattr(self, cache_func).invalidate(tuple(keys))
except AttributeError:
logger.warn("Got unexpected cache_func: %r", cache_func)
self._cache_id_gen.advance(int(stream["position"]))
return defer.succeed(None)

11
synapse/storage/__init__.py
View File

@ -50,6 +50,7 @@ from .openid import OpenIdStore
from .client_ips import ClientIpStore
from .util.id_generators import IdGenerator, StreamIdGenerator, ChainedIdGenerator
from .engines import PostgresEngine
from synapse.api.constants import PresenceState
from synapse.util.caches.stream_change_cache import StreamChangeCache
@ -122,9 +123,13 @@ class DataStore(RoomMemberStore, RoomStore,
db_conn, "pushers", "id",
extra_tables=[("deleted_pushers", "stream_id")],
)
self._cache_id_gen = StreamIdGenerator(
db_conn, "cache_stream", "stream_id",
)
if isinstance(self.database_engine, PostgresEngine):
self._cache_id_gen = StreamIdGenerator(
db_conn, "cache_stream", "stream_id",
)
else:
self._cache_id_gen = None
events_max = self._stream_id_gen.get_current_token()
event_cache_prefill, min_event_val = self._get_cache_dict(

47
synapse/storage/_base.py
View File

@ -19,6 +19,7 @@ from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
from synapse.util.caches.dictionary_cache import DictionaryCache
from synapse.util.caches.descriptors import Cache
from synapse.util.caches import intern_dict
from synapse.storage.engines import PostgresEngine
import synapse.metrics
@ -864,21 +865,43 @@ class SQLBaseStore(object):
def _invalidate_cache_and_stream(self, txn, cache_func, keys):
txn.call_after(cache_func.invalidate, keys)
ctx = self._cache_id_gen.get_next()
stream_id = ctx.__enter__()
txn.call_after(ctx.__exit__, None, None, None)
if isinstance(self.database_engine, PostgresEngine):
ctx = self._cache_id_gen.get_next()
stream_id = ctx.__enter__()
txn.call_after(ctx.__exit__, None, None, None)
self._simple_insert_txn(
txn,
table="cache_stream",
values={
"stream_id": stream_id,
"cache_func": cache_func.__name__,
"keys": list(keys),
"invalidation_ts": self.clock.time_msec(),
}
self._simple_insert_txn(
txn,
table="cache_stream",
values={
"stream_id": stream_id,
"cache_func": cache_func.__name__,
"keys": list(keys),
"invalidation_ts": self.clock.time_msec(),
}
)
def get_all_updated_caches(self, last_id, current_id, limit):
def get_all_updated_caches_txn(txn):
# We purposefully don't bound by the current token, as we want to
# send across cache invalidations as quickly as possible. Cache
# invalidations are idempotent, so duplicates are fine.
sql = (
"SELECT stream_id, cache_func, keys, invalidation_ts FROM cache_stream"
" WHERE stream_id > ? ORDER BY stream_id ASC LIMIT ?"
)
txn.execute(sql, (last_id, limit,))
return txn.fetchall()
return self.runInteraction(
"get_all_updated_caches", get_all_updated_caches_txn
)
def get_cache_stream_token(self):
if self._cache_id_gen:
return self._cache_id_gen.get_current_token()
else:
return 0
class _RollbackButIsFineException(Exception):
""" This exception is used to rollback a transaction without implying