diff --git a/synapse/util/retryutils.py b/synapse/util/retryutils.py
index 26cce7d197..f6dfa77d8f 100644
--- a/synapse/util/retryutils.py
+++ b/synapse/util/retryutils.py
@@ -46,8 +46,7 @@ class NotRetryingDestination(Exception):
@defer.inlineCallbacks
-def get_retry_limiter(destination, clock, store, ignore_backoff=False,
- **kwargs):
+def get_retry_limiter(destination, clock, store, ignore_backoff=False, **kwargs):
"""For a given destination check if we have previously failed to
send a request there and are waiting before retrying the destination.
If we are not ready to retry the destination, this will raise a
@@ -60,8 +59,7 @@ def get_retry_limiter(destination, clock, store, ignore_backoff=False,
clock (synapse.util.clock): timing source
store (synapse.storage.transactions.TransactionStore): datastore
ignore_backoff (bool): true to ignore the historical backoff data and
- try the request anyway. We will still update the next
- retry_interval on success/failure.
+ try the request anyway. We will still reset the retry_interval on success.
Example usage:
@@ -75,13 +73,12 @@ def get_retry_limiter(destination, clock, store, ignore_backoff=False,
"""
retry_last_ts, retry_interval = (0, 0)
- retry_timings = yield store.get_destination_retry_timings(
- destination
- )
+ retry_timings = yield store.get_destination_retry_timings(destination)
if retry_timings:
retry_last_ts, retry_interval = (
- retry_timings["retry_last_ts"], retry_timings["retry_interval"]
+ retry_timings["retry_last_ts"],
+ retry_timings["retry_interval"],
)
now = int(clock.time_msec())
@@ -93,22 +90,31 @@ def get_retry_limiter(destination, clock, store, ignore_backoff=False,
destination=destination,
)
+ # if we are ignoring the backoff data, we should also not increment the backoff
+ # when we get another failure - otherwise a server can very quickly reach the
+ # maximum backoff even though it might only have been down briefly
+ backoff_on_failure = not ignore_backoff
+
defer.returnValue(
RetryDestinationLimiter(
- destination,
- clock,
- store,
- retry_interval,
- **kwargs
+ destination, clock, store, retry_interval, backoff_on_failure, **kwargs
)
)
class RetryDestinationLimiter(object):
- def __init__(self, destination, clock, store, retry_interval,
- min_retry_interval=10 * 60 * 1000,
- max_retry_interval=24 * 60 * 60 * 1000,
- multiplier_retry_interval=5, backoff_on_404=False):
+ def __init__(
+ self,
+ destination,
+ clock,
+ store,
+ retry_interval,
+ min_retry_interval=10 * 60 * 1000,
+ max_retry_interval=24 * 60 * 60 * 1000,
+ multiplier_retry_interval=5,
+ backoff_on_404=False,
+ backoff_on_failure=True,
+ ):
"""Marks the destination as "down" if an exception is thrown in the
context, except for CodeMessageException with code < 500.
@@ -128,6 +134,9 @@ class RetryDestinationLimiter(object):
multiplier_retry_interval (int): The multiplier to use to increase
the retry interval after a failed request.
backoff_on_404 (bool): Back off if we get a 404
+
+ backoff_on_failure (bool): set to False if we should not increase the
+ retry interval on a failure.
"""
self.clock = clock
self.store = store
@@ -138,6 +147,7 @@ class RetryDestinationLimiter(object):
self.max_retry_interval = max_retry_interval
self.multiplier_retry_interval = multiplier_retry_interval
self.backoff_on_404 = backoff_on_404
+ self.backoff_on_failure = backoff_on_failure
def __enter__(self):
pass
@@ -173,10 +183,13 @@ class RetryDestinationLimiter(object):
if not self.retry_interval:
return
- logger.debug("Connection to %s was successful; clearing backoff",
- self.destination)
+ logger.debug(
+ "Connection to %s was successful; clearing backoff", self.destination
+ )
retry_last_ts = 0
self.retry_interval = 0
+ elif not self.backoff_on_failure:
+ return
else:
# We couldn't connect.
if self.retry_interval:
@@ -190,7 +203,10 @@ class RetryDestinationLimiter(object):
logger.info(
"Connection to %s was unsuccessful (%s(%s)); backoff now %i",
- self.destination, exc_type, exc_val, self.retry_interval
+ self.destination,
+ exc_type,
+ exc_val,
+ self.retry_interval,
)
retry_last_ts = int(self.clock.time_msec())
@@ -201,9 +217,7 @@ class RetryDestinationLimiter(object):
self.destination, retry_last_ts, self.retry_interval
)
except Exception:
- logger.exception(
- "Failed to store destination_retry_timings",
- )
+ logger.exception("Failed to store destination_retry_timings")
# we deliberately do this in the background.
synapse.util.logcontext.run_in_background(store_retry_timings)
|
