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synapse loaded by lots of /federation/v1/event/... requests #2164

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richvdh opened this issue Apr 26, 2017 · 1 comment
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synapse loaded by lots of /federation/v1/event/... requests #2164

richvdh opened this issue Apr 26, 2017 · 1 comment
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A-Federation A-Performance Performance, both client-facing and admin-facing O-Uncommon Most users are unlikely to come across this or unexpected workflow S-Minor Blocks non-critical functionality, workarounds exist. T-Defect Bugs, crashes, hangs, security vulnerabilities, or other reported issues.

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@richvdh
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richvdh commented Apr 26, 2017

Every so often, my synapse goes off and spends a couple of hours spinning at 100% CPU. Investigation reveals that it is mostly spending that time processing /federation/v1/event/ requests - basically some other server in the federation starts hammering it for a load of events.

There are two questions here:

  • why are other servers hammering it?
  • it seems surprisingly expensive to serve the request. The CPU times are quite variable but some of them are over 200ms per request - which takes a while when there are tens of thousands of requests.
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richvdh commented Apr 26, 2017

anecdotally, the worst offenders seem to be on older synapses; in particular stephenson.cc which is on 0.18.7.

@richvdh richvdh mentioned this issue Apr 26, 2017
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@reivilibre reivilibre added A-Performance Performance, both client-facing and admin-facing T-Defect Bugs, crashes, hangs, security vulnerabilities, or other reported issues. S-Minor Blocks non-critical functionality, workarounds exist. O-Uncommon Most users are unlikely to come across this or unexpected workflow labels May 23, 2023
@matrixbot matrixbot mentioned this issue Dec 21, 2023
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A-Federation A-Performance Performance, both client-facing and admin-facing O-Uncommon Most users are unlikely to come across this or unexpected workflow S-Minor Blocks non-critical functionality, workarounds exist. T-Defect Bugs, crashes, hangs, security vulnerabilities, or other reported issues.
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