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Add some randomness to the user specified timeout on event streams to mitigate against thundering herds problems

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This commit is contained in:
Erik Johnston 2015-03-06 10:25:36 +00:00
parent 5b5c7a28d6
commit 130df8fb01
1 changed files with 9 additions and 0 deletions
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9
synapse/handlers/events.py
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@ -23,6 +23,7 @@ from synapse.events.utils import serialize_event
from ._base import BaseHandler
import logging
import random
logger = logging.getLogger(__name__)
@ -72,6 +73,14 @@ class EventStreamHandler(BaseHandler):
rm_handler = self.hs.get_handlers().room_member_handler
room_ids = yield rm_handler.get_rooms_for_user(auth_user)
if timeout:
# If they've set a timeout set a minimum limit.
timeout = max(timeout, 500)
# Add some randomness to this value to try and mitigate against
# thundering herds on restart.
timeout = random.randint(int(timeout*0.9), int(timeout*1.1))
with PreserveLoggingContext():
events, tokens = yield self.notifier.get_events_for(
auth_user, room_ids, pagin_config, timeout