forked-synapse/synapse/replication/tcp/client.py
Erik Johnston 8de3703d21
Make event persisters periodically announce position over replication. (#8499)
Currently background proccesses stream the events stream use the "minimum persisted position" (i.e. `get_current_token()`) rather than the vector clock style tokens. This is broadly fine as it doesn't matter if the background processes lag a small amount. However, in extreme cases (i.e. SyTests) where we only write to one event persister the background processes will never make progress.

This PR changes it so that the `MultiWriterIDGenerator` keeps the current position of a given instance as up to date as possible (i.e using the latest token it sees if its not in the process of persisting anything), and then periodically announces that over replication. This then allows the "minimum persisted position" to advance, albeit with a small lag.
2020-10-12 15:51:41 +01:00

237 lines
9.3 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""A replication client for use by synapse workers.
"""
import logging
from typing import TYPE_CHECKING, Dict, List, Tuple
from twisted.internet.defer import Deferred
from twisted.internet.protocol import ReconnectingClientFactory
from synapse.api.constants import EventTypes
from synapse.logging.context import PreserveLoggingContext, make_deferred_yieldable
from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
from synapse.replication.tcp.streams import TypingStream
from synapse.replication.tcp.streams.events import (
EventsStream,
EventsStreamEventRow,
EventsStreamRow,
)
from synapse.types import PersistedEventPosition, UserID
from synapse.util.async_helpers import timeout_deferred
from synapse.util.metrics import Measure
if TYPE_CHECKING:
from synapse.replication.tcp.handler import ReplicationCommandHandler
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
# How long we allow callers to wait for replication updates before timing out.
_WAIT_FOR_REPLICATION_TIMEOUT_SECONDS = 30
class DirectTcpReplicationClientFactory(ReconnectingClientFactory):
"""Factory for building connections to the master. Will reconnect if the
connection is lost.
Accepts a handler that is passed to `ClientReplicationStreamProtocol`.
"""
initialDelay = 0.1
maxDelay = 1 # Try at least once every N seconds
def __init__(
self,
hs: "HomeServer",
client_name: str,
command_handler: "ReplicationCommandHandler",
):
self.client_name = client_name
self.command_handler = command_handler
self.server_name = hs.config.server_name
self.hs = hs
self._clock = hs.get_clock() # As self.clock is defined in super class
hs.get_reactor().addSystemEventTrigger("before", "shutdown", self.stopTrying)
def startedConnecting(self, connector):
logger.info("Connecting to replication: %r", connector.getDestination())
def buildProtocol(self, addr):
logger.info("Connected to replication: %r", addr)
return ClientReplicationStreamProtocol(
self.hs,
self.client_name,
self.server_name,
self._clock,
self.command_handler,
)
def clientConnectionLost(self, connector, reason):
logger.error("Lost replication conn: %r", reason)
ReconnectingClientFactory.clientConnectionLost(self, connector, reason)
def clientConnectionFailed(self, connector, reason):
logger.error("Failed to connect to replication: %r", reason)
ReconnectingClientFactory.clientConnectionFailed(self, connector, reason)
class ReplicationDataHandler:
"""Handles incoming stream updates from replication.
This instance notifies the slave data store about updates. Can be subclassed
to handle updates in additional ways.
"""
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastore()
self.notifier = hs.get_notifier()
self._reactor = hs.get_reactor()
self._clock = hs.get_clock()
self._streams = hs.get_replication_streams()
self._instance_name = hs.get_instance_name()
self._typing_handler = hs.get_typing_handler()
# Map from stream to list of deferreds waiting for the stream to
# arrive at a particular position. The lists are sorted by stream position.
self._streams_to_waiters = (
{}
) # type: Dict[str, List[Tuple[int, Deferred[None]]]]
async def on_rdata(
self, stream_name: str, instance_name: str, token: int, rows: list
):
"""Called to handle a batch of replication data with a given stream token.
By default this just pokes the slave store. Can be overridden in subclasses to
handle more.
Args:
stream_name: name of the replication stream for this batch of rows
instance_name: the instance that wrote the rows.
token: stream token for this batch of rows
rows: a list of Stream.ROW_TYPE objects as returned by Stream.parse_row.
"""
self.store.process_replication_rows(stream_name, instance_name, token, rows)
if stream_name == TypingStream.NAME:
self._typing_handler.process_replication_rows(token, rows)
self.notifier.on_new_event(
"typing_key", token, rooms=[row.room_id for row in rows]
)
if stream_name == EventsStream.NAME:
# We shouldn't get multiple rows per token for events stream, so
# we don't need to optimise this for multiple rows.
for row in rows:
if row.type != EventsStreamEventRow.TypeId:
continue
assert isinstance(row, EventsStreamRow)
event = await self.store.get_event(
row.data.event_id, allow_rejected=True
)
if event.rejected_reason:
continue
extra_users = () # type: Tuple[UserID, ...]
if event.type == EventTypes.Member:
extra_users = (UserID.from_string(event.state_key),)
max_token = self.store.get_room_max_token()
event_pos = PersistedEventPosition(instance_name, token)
self.notifier.on_new_room_event(
event, event_pos, max_token, extra_users
)
# Notify any waiting deferreds. The list is ordered by position so we
# just iterate through the list until we reach a position that is
# greater than the received row position.
waiting_list = self._streams_to_waiters.get(stream_name, [])
# Index of first item with a position after the current token, i.e we
# have called all deferreds before this index. If not overwritten by
# loop below means either a) no items in list so no-op or b) all items
# in list were called and so the list should be cleared. Setting it to
# `len(list)` works for both cases.
index_of_first_deferred_not_called = len(waiting_list)
for idx, (position, deferred) in enumerate(waiting_list):
if position <= token:
try:
with PreserveLoggingContext():
deferred.callback(None)
except Exception:
# The deferred has been cancelled or timed out.
pass
else:
# The list is sorted by position so we don't need to continue
# checking any further entries in the list.
index_of_first_deferred_not_called = idx
break
# Drop all entries in the waiting list that were called in the above
# loop. (This maintains the order so no need to resort)
waiting_list[:] = waiting_list[index_of_first_deferred_not_called:]
async def on_position(self, stream_name: str, instance_name: str, token: int):
self.store.process_replication_rows(stream_name, instance_name, token, [])
# We poke the generic "replication" notifier to wake anything up that
# may be streaming.
self.notifier.notify_replication()
def on_remote_server_up(self, server: str):
"""Called when get a new REMOTE_SERVER_UP command."""
async def wait_for_stream_position(
self, instance_name: str, stream_name: str, position: int
):
"""Wait until this instance has received updates up to and including
the given stream position.
"""
if instance_name == self._instance_name:
# We don't get told about updates written by this process, and
# anyway in that case we don't need to wait.
return
current_position = self._streams[stream_name].current_token(self._instance_name)
if position <= current_position:
# We're already past the position
return
# Create a new deferred that times out after N seconds, as we don't want
# to wedge here forever.
deferred = Deferred()
deferred = timeout_deferred(
deferred, _WAIT_FOR_REPLICATION_TIMEOUT_SECONDS, self._reactor
)
waiting_list = self._streams_to_waiters.setdefault(stream_name, [])
waiting_list.append((position, deferred))
waiting_list.sort(key=lambda t: t[0])
# We measure here to get in flight counts and average waiting time.
with Measure(self._clock, "repl.wait_for_stream_position"):
logger.info("Waiting for repl stream %r to reach %s", stream_name, position)
await make_deferred_yieldable(deferred)
logger.info(
"Finished waiting for repl stream %r to reach %s", stream_name, position
)