RFR: 1801: Exclude some GraphQL calls from RestRequestCache rate limiter

Erik Joelsson erikj at openjdk.org
Tue Jan 24 14:45:43 UTC 2023

In [SKARA-1731](https://bugs.openjdk.org/browse/SKARA-1731), the best practices regarding non GET requests on Github became better enforced. Unfortunately that has lead to some unexpected performance issues. I believe this is mostly caused by GraphQL requests, which are always POST, being treated as a non GET REST requests by the limiter and limited to one per second. This limitation on a subset of our github queries is currently causing a queue buildup for that lock, which stabilizes to about 1m wait time. This delay is slowing down response times from the bots massively.

Reading the Integrator best practices document again (https://docs.github.com/en/rest/guides/best-practices-for-integrators?apiVersion=2022-11-28) and the GraphQL resource limitations (https://docs.github.com/en/graphql/overview/resource-limitations) I'm pretty sure you aren't supposed to limit GraphQL to one call per second, but rather just make sure you stay within the points limit. The one per second recommendation is for the REST API.

I want to make it possible to exclude certain calls from this rate limiter to see if this can alleviate the contention we are currently seeing. I have run with this patch for the pr bot since yesterday afternoon (PT) and it seems to be working well.

Two PRs were unable to integrate yesterday due to this contention:


Commit messages:
 - SKARA-1801

Changes: https://git.openjdk.org/skara/pull/1461/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1461&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1801
  Stats: 19 lines in 4 files changed: 10 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/skara/pull/1461.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1461/head:pull/1461

PR: https://git.openjdk.org/skara/pull/1461

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