weightedroundrobin: Implements Slow Start (gRFC A100) [WiP] #8689
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Implements slow start functionality as described in [gRFC A100](grpc/proposal#498) I still need to do some work on tests and do an e2e experiment with xDS to ensure that things are working as expected, but the core implementation is in a state that can be reviewed. At this phase I'm mainly looking for feedback on the overall approach and design and in the test code because I am worried that I might be missing some test utility that would make testing with `time` easier. Pending Items before this is ready to be merged: - [ ] Add more unit tests for slow start config cases - [ ] Manually verify with an xDS experiment that slow start is working as expected Release Notes * weightedroundrobin: Implements slow start functionality as described in [gRFC A100](grpc/proposal#498) Signed-off-by: sotiris <[email protected]>
Signed-off-by: sotiris <[email protected]>
Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## master #8689 +/- ##
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- Coverage 83.43% 83.40% -0.04%
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Files 415 415
Lines 32195 32236 +41
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+ Hits 26863 26886 +23
- Misses 3980 3991 +11
- Partials 1352 1359 +7
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davinci26
commented
Nov 1, 2025
| github.com/envoyproxy/go-control-plane/envoy v1.35.0 | ||
| github.com/cncf/xds/go v0.0.0-20251014123835-2ee22ca58382 | ||
| github.com/envoyproxy/go-control-plane v0.13.4 | ||
| github.com/envoyproxy/go-control-plane/envoy v1.35.1-0.20251015221300-4138018a492b |
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imports a commit because the proto is not in a release yet, validate this is the correct version for all deps
Signed-off-by: sotiris <[email protected]>
Signed-off-by: sotiris <[email protected]>
Signed-off-by: sotiris <[email protected]>
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Don't want to commit this code because it introduces a new dependencies but wanted to make sure the 
(Note the flatline at start is due to |
Signed-off-by: sotiris <[email protected]>
Signed-off-by: sotiris <[email protected]>
Signed-off-by: sotiris <[email protected]>
Signed-off-by: sotiris <[email protected]>
davinci26
changed the title
davinci26
commented
Nov 3, 2025
| if slowStartConfigCfg := cswrrProto.GetSlowStartConfig(); slowStartConfigCfg != nil { | ||
| wrrLBCfg.SlowStartConfig = &weightedroundrobin.SlowStartConfig{ | ||
| SlowStartWindow: internalserviceconfig.Duration(slowStartConfigCfg.GetSlowStartWindow().AsDuration()), | ||
| // SlowStartConfig uses a runtime value in the proto definition so we need to get either the default value or the runtime value |
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Wanted to call some attention here since this is a bit of subtle point, where I made a decision but maybe its worth clarifying in the gRFC
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Implements slow start functionality as described in gRFC A100
I still need to do some work on tests and do an e2e experiment with xDS to ensure that things are working as expected, but the core implementation is in a state that can be reviewed.
At this phase I'm mainly looking for feedback on the overall approach and design and in the test code because I am worried that I might be missing some test utility that would make testing with
timeeasier.Pending Items before this is ready to be merged:
Release Notes
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