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Start fewer opentracing spans (#8640)

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#8567 started a span for every background process. This is good as it means all Synapse code that gets run should be in a span (unless in the sentinel logging context), but it means we generate about 15x the number of spans as we did previously.

This PR attempts to reduce that number by a) not starting one for send commands to Redis, and b) deferring starting background processes until after we're sure they're necessary.

I don't really know how much this will help.
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Erik Johnston 2020-10-26 09:30:19 +00:00 • committed by GitHub
parent 34a5696f93
commit 2b7c180879
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8 changed files with 96 additions and 53 deletions
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18
synapse/push/pusherpool.py
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@ -19,7 +19,10 @@ from typing import TYPE_CHECKING, Dict, Union
from prometheus_client import Gauge
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.metrics.background_process_metrics import (
run_as_background_process,
wrap_as_background_process,
)
from synapse.push import PusherConfigException
from synapse.push.emailpusher import EmailPusher
from synapse.push.httppusher import HttpPusher
@ -187,7 +190,7 @@ class PusherPool:
)
await self.remove_pusher(p["app_id"], p["pushkey"], p["user_name"])
async def on_new_notifications(self, max_token: RoomStreamToken):
def on_new_notifications(self, max_token: RoomStreamToken):
if not self.pushers:
# nothing to do here.
return
@ -201,6 +204,17 @@ class PusherPool:
# Nothing to do
return
# We only start a new background process if necessary rather than
# optimistically (to cut down on overhead).
self._on_new_notifications(max_token)
@wrap_as_background_process("on_new_notifications")
async def _on_new_notifications(self, max_token: RoomStreamToken):
# We just use the minimum stream ordering and ignore the vector clock
# component. This is safe to do as long as we *always* ignore the vector
# clock components.
max_stream_id = max_token.stream
prev_stream_id = self._last_room_stream_id_seen
self._last_room_stream_id_seen = max_stream_id