Merge pull request #7584 from matrix-org/erikj/save_and_send_fed_token_in_bg
Speed up processing of federation stream RDATA rows.
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commit
8c5f88fa4d
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Speed up processing of federation stream RDATA rows.
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@ -863,9 +863,24 @@ class FederationSenderHandler(object):
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a FEDERATION_ACK back to the master, and stores the token that we have processed
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in `federation_stream_position` so that we can restart where we left off.
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"""
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try:
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self.federation_position = token
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self.federation_position = token
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# We save and send the ACK to master asynchronously, so we don't block
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# processing on persistence. We don't need to do this operation for
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# every single RDATA we receive, we just need to do it periodically.
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if self._fed_position_linearizer.is_queued(None):
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# There is already a task queued up to save and send the token, so
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# no need to queue up another task.
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return
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run_as_background_process("_save_and_send_ack", self._save_and_send_ack)
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async def _save_and_send_ack(self):
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"""Save the current federation position in the database and send an ACK
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to master with where we're up to.
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"""
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try:
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# We linearize here to ensure we don't have races updating the token
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#
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# XXX this appears to be redundant, since the ReplicationCommandHandler
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@ -875,16 +890,18 @@ class FederationSenderHandler(object):
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# we're not being re-entered?
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with (await self._fed_position_linearizer.queue(None)):
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# We persist and ack the same position, so we take a copy of it
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# here as otherwise it can get modified from underneath us.
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current_position = self.federation_position
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await self.store.update_federation_out_pos(
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"federation", self.federation_position
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"federation", current_position
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)
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# We ACK this token over replication so that the master can drop
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# its in memory queues
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self._hs.get_tcp_replication().send_federation_ack(
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self.federation_position
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)
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self._last_ack = self.federation_position
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self._hs.get_tcp_replication().send_federation_ack(current_position)
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self._last_ack = current_position
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except Exception:
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logger.exception("Error updating federation stream position")
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@ -225,6 +225,18 @@ class Linearizer(object):
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{}
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) # type: Dict[str, Sequence[Union[int, Dict[defer.Deferred, int]]]]
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def is_queued(self, key) -> bool:
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"""Checks whether there is a process queued up waiting
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"""
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entry = self.key_to_defer.get(key)
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if not entry:
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# No entry so nothing is waiting.
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return False
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# There are waiting deferreds only in the OrderedDict of deferreds is
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# non-empty.
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return bool(entry[1])
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def queue(self, key):
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# we avoid doing defer.inlineCallbacks here, so that cancellation works correctly.
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# (https://twistedmatrix.com/trac/ticket/4632 meant that cancellations were not
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@ -45,6 +45,38 @@ class LinearizerTestCase(unittest.TestCase):
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with (yield d2):
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pass
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@defer.inlineCallbacks
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def test_linearizer_is_queued(self):
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linearizer = Linearizer()
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key = object()
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d1 = linearizer.queue(key)
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cm1 = yield d1
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# Since d1 gets called immediately, "is_queued" should return false.
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self.assertFalse(linearizer.is_queued(key))
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d2 = linearizer.queue(key)
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self.assertFalse(d2.called)
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# Now d2 is queued up behind successful completion of cm1
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self.assertTrue(linearizer.is_queued(key))
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with cm1:
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self.assertFalse(d2.called)
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# cm1 still not done, so d2 still queued.
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self.assertTrue(linearizer.is_queued(key))
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# And now d2 is called and nothing is in the queue again
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self.assertFalse(linearizer.is_queued(key))
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with (yield d2):
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self.assertFalse(linearizer.is_queued(key))
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self.assertFalse(linearizer.is_queued(key))
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def test_lots_of_queued_things(self):
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# we have one slow thing, and lots of fast things queued up behind it.
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# it should *not* explode the stack.
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