lovelock opened a new pull request, #13759:
URL: https://github.com/apache/apisix/pull/13759
Introduces a new plugin that distributes a cluster-wide global rate across N
nodes using a shared metadata-driven instance_count.
Behavior:
local_rate = global_rate / instance_count
local_burst = global_burst / instance_count
instance_count is stored in plugin_metadata, refreshed every 10s by a
per-worker background timer. Defaults to 1 when metadata is unset.
Default rejected_code is 429 (Too Many Requests).
### Description
Standard limit-req is per-node: N nodes each with rate=100 effectively allow
N*100 req/s cluster-wide.
This plugin solves this by accepting a global_rate at the route level and
computing local_rate = global_rate / instance_count per node. instance_count is
configured cluster-wide via plugin_metadata, and each node's timer picks it up
every 10 seconds.
The approach uses only local shared dicts (no cross-node coordination),
making it efficient and avoiding single points of failure.
#### Which issue(s) this PR fixes:
N/A — new feature.
### Checklist
- [x] I have explained the need for this PR and the problem it solves
- [x] I have explained the changes or the new features added to this PR
- [x] I have added tests corresponding to this change
- [ ] I have updated the documentation to reflect this change
- [ ] I have verified that this change is backward compatible (If not,
please discuss on the [APISIX mailing
list](https://github.com/apache/apisix/tree/master#community) first)
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