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https://github.com/element-hq/synapse
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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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@ -23,6 +23,7 @@ from synapse.events.utils import serialize_event
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from ._base import BaseHandler
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import logging
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import random
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logger = logging.getLogger(__name__)
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@ -72,6 +73,14 @@ class EventStreamHandler(BaseHandler):
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rm_handler = self.hs.get_handlers().room_member_handler
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room_ids = yield rm_handler.get_rooms_for_user(auth_user)
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if timeout:
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# If they've set a timeout set a minimum limit.
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timeout = max(timeout, 500)
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# Add some randomness to this value to try and mitigate against
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# thundering herds on restart.
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timeout = random.randint(int(timeout*0.9), int(timeout*1.1))
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with PreserveLoggingContext():
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events, tokens = yield self.notifier.get_events_for(
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auth_user, room_ids, pagin_config, timeout
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