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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.
This commit is contained in:
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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synapse/replication/tcp/redis.py
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@ -166,7 +166,9 @@ class RedisSubscriber(txredisapi.SubscriberProtocol, AbstractConnection):
Args:
cmd (Command)
"""
run_as_background_process("send-cmd", self._async_send_command, cmd)
run_as_background_process(
"send-cmd", self._async_send_command, cmd, bg_start_span=False
)
async def _async_send_command(self, cmd: Command):
"""Encode a replication command and send it over our outbound connection"""