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Properly update retry_last_ts when hitting the maximum retry interval (#16156)

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* Properly update retry_last_ts when hitting the maximum retry interval

This was broken in 1.87 when the maximum retry interval got changed from
almost infinite to a week (and made configurable).

fixes #16101

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>

* Add changelog

* Change fix + add test

* Add comment

---------

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>
Co-authored-by: Mathieu Velten <mathieuv@matrix.org>
This commit is contained in:
DeepBlueV7.X 2023-08-23 08:35:23 +00:00 committed by GitHub
parent dffe095642
commit 19a1cda084
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3 changed files with 55 additions and 1 deletions
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1
changelog.d/16156.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug introduced in 1.87 where synapse would send an excessive amount of federation requests to servers which have been offline for a long time. Contributed by Nico.

4
synapse/storage/databases/main/transactions.py
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@ -242,6 +242,8 @@ class TransactionWorkerStore(CacheInvalidationWorkerStore):
) -> None:
# Upsert retry time interval if retry_interval is zero (i.e. we're
# resetting it) or greater than the existing retry interval.
# We also upsert when the new retry interval is the same as the existing one,
# since it will be the case when `destination_max_retry_interval` is reached.
#
# WARNING: This is executed in autocommit, so we shouldn't add any more
# SQL calls in here (without being very careful).
@ -257,7 +259,7 @@ class TransactionWorkerStore(CacheInvalidationWorkerStore):
WHERE
EXCLUDED.retry_interval = 0
OR destinations.retry_interval IS NULL
OR destinations.retry_interval < EXCLUDED.retry_interval
OR destinations.retry_interval <= EXCLUDED.retry_interval
"""
txn.execute(sql, (destination, failure_ts, retry_last_ts, retry_interval))

51
tests/util/test_retryutils.py
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@ -108,3 +108,54 @@ class RetryLimiterTestCase(HomeserverTestCase):
new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
self.assertIsNone(new_timings)
def test_max_retry_interval(self) -> None:
"""Test that `destination_max_retry_interval` setting works as expected"""
store = self.hs.get_datastores().main
destination_max_retry_interval_ms = (
self.hs.config.federation.destination_max_retry_interval_ms
)
self.get_success(get_retry_limiter("test_dest", self.clock, store))
self.pump(1)
failure_ts = self.clock.time_msec()
# Simulate reaching destination_max_retry_interval
self.get_success(
store.set_destination_retry_timings(
"test_dest",
failure_ts=failure_ts,
retry_last_ts=failure_ts,
retry_interval=destination_max_retry_interval_ms,
)
)
# Check it fails
self.get_failure(
get_retry_limiter("test_dest", self.clock, store), NotRetryingDestination
)
# Get past retry_interval and we can try again, and still throw an error to continue the backoff
self.reactor.advance(destination_max_retry_interval_ms / 1000 + 1)
limiter = self.get_success(get_retry_limiter("test_dest", self.clock, store))
self.pump(1)
try:
with limiter:
self.pump(1)
raise AssertionError("argh")
except AssertionError:
pass
self.pump()
# retry_interval does not increase and stays at destination_max_retry_interval_ms
new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
assert new_timings is not None
self.assertEqual(new_timings.retry_interval, destination_max_retry_interval_ms)
# Check it fails
self.get_failure(
get_retry_limiter("test_dest", self.clock, store), NotRetryingDestination
)