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Periodically send pings to detect dead Redis connections (#9218)

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This is done by creating a custom `RedisFactory` subclass that
periodically pings all connections in its pool.

We also ensure that the `replyTimeout` param is non-null, so that we
timeout waiting for the reply to those pings (and thus triggering a
reconnect).
This commit is contained in:
Erik Johnston 2021-01-26 10:54:54 +00:00 • committed by GitHub
parent 5b857b77f7
commit a1ff1e967f
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4 changed files with 107 additions and 57 deletions
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8
synapse/replication/tcp/handler.py
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@ -15,6 +15,7 @@
# limitations under the License.
import logging
from typing import (
TYPE_CHECKING,
Any,
Awaitable,
Dict,
@ -63,6 +64,9 @@ from synapse.replication.tcp.streams import (
TypingStream,
)
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
@ -88,7 +92,7 @@ class ReplicationCommandHandler:
back out to connections.
"""
def __init__(self, hs):
def __init__(self, hs: "HomeServer"):
self._replication_data_handler = hs.get_replication_data_handler()
self._presence_handler = hs.get_presence_handler()
self._store = hs.get_datastore()
@ -300,7 +304,7 @@ class ReplicationCommandHandler:
# First create the connection for sending commands.
outbound_redis_connection = lazyConnection(
reactor=hs.get_reactor(),
hs=hs,
host=hs.config.redis_host,
port=hs.config.redis_port,
password=hs.config.redis.redis_password,