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Merge pull request #3903 from matrix-org/rav/increase_get_missing_events_timeout 

Bump timeout on get_missing_events request
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Amber Brown 2018-09-19 17:57:48 +10:00 committed by GitHub
parent a219ce8726 8565d9a9fe
commit f773ecbd61
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2 changed files with 31 additions and 1 deletions
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changelog.d/3903.misc Normal file
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@ -0,0 +1 @@
Increase the timeout when filling missing events in federation requests

31
synapse/handlers/federation.py
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@ -360,6 +360,35 @@ class FederationHandler(BaseHandler):
# apparently.
#
# see https://github.com/matrix-org/synapse/pull/1744
#
# ----
#
# Update richvdh 2018/09/18: There are a number of problems with timing this
# request out agressively on the client side:
#
# - it plays badly with the server-side rate-limiter, which starts tarpitting you
# if you send too many requests at once, so you end up with the server carefully
# working through the backlog of your requests, which you have already timed
# out.
#
# - for this request in particular, we now (as of
# https://github.com/matrix-org/synapse/pull/3456) reject any PDUs where the
# server can't produce a plausible-looking set of prev_events - so we becone
# much more likely to reject the event.
#
# - contrary to what it says above, we do *not* fall back to fetching fresh state
# for the room if get_missing_events times out. Rather, we give up processing
# the PDU whose prevs we are missing, which then makes it much more likely that
# we'll end up back here for the *next* PDU in the list, which exacerbates the
# problem.
#
# - the agressive 10s timeout was introduced to deal with incoming federation
# requests taking 8 hours to process. It's not entirely clear why that was going
# on; certainly there were other issues causing traffic storms which are now
# resolved, and I think in any case we may be more sensible about our locking
# now. We're *certainly* more sensible about our logging.
#
# All that said: Let's try increasing the timout to 60s and see what happens.
missing_events = yield self.federation_client.get_missing_events(
origin,
@ -368,7 +397,7 @@ class FederationHandler(BaseHandler):
latest_events=[pdu],
limit=10,
min_depth=min_depth,
timeout=10000,
timeout=60000,
)
logger.info(