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https://github.com/element-hq/synapse
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Add some randomness to the high-cpu backoff hack
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2 changed files with 12 additions and 4 deletions
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@ -165,8 +165,8 @@ class FederationSender(object):
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and not self._transaction_manager.deprioritise_transmission
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):
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logger.warning(
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"Event processing loop is getting behind: deprioritising "
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"transaction transmission"
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"Event queue is getting behind: deprioritising transaction "
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"transmission"
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)
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self._transaction_manager.deprioritise_transmission = True
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@ -15,6 +15,7 @@
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# limitations under the License.
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import datetime
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import logging
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import random
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from prometheus_client import Counter
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@ -36,6 +37,8 @@ from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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# This is defined in the Matrix spec and enforced by the receiver.
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MAX_EDUS_PER_TRANSACTION = 100
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DEPRIORITISE_SLEEP_TIME = 10
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logger = logging.getLogger(__name__)
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@ -191,8 +194,13 @@ class PerDestinationQueue(object):
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while True:
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if self._transaction_manager.deprioritise_transmission:
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# if the event-processing loop has got behind, sleep to give it
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# a chance to catch up
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yield self._clock.sleep(2)
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# a chance to catch up. Add some randomness so that the transmitters
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# don't all wake up in sync.
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sleeptime = random.uniform(
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DEPRIORITISE_SLEEP_TIME, DEPRIORITISE_SLEEP_TIME * 2
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)
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logger.info("TX [%s]: sleeping for %f seconds", sleeptime)
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yield self._clock.sleep(sleeptime)
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# We have to keep 2 free slots for presence and rr_edus
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limit = MAX_EDUS_PER_TRANSACTION - 2
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