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otelgrpc: Deprecate interceptors in favor of stats handlers #4534

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merged 4 commits into from
Nov 8, 2023

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@pellared pellared commented Nov 7, 2023

Fixes #4318

We strongly still recommend you to use stats.Handler, mainly for two reasons.

Functional advantages: stats.Handler has more information for user to build more flexible and granular metric, for example:

  • multiple different types of represent "data length": In stats.InPayload, there exists "Length", "CompressedLength", "WireLength" to denote the size of uncompressed, compressed payload data, with or without framing data. But in interceptors, we can only got uncompressed data, and this feature is also removed due to performance problem.
  • more accurate timestamp: stats.InPayload's "RecvTime" and stats.OutPayload's "SentTime" records more accurate timestamp that server got and sent the message, the timestamp recorded by interceptors depends on the location of this interceptors in the total interceptor chain.
  • some other use cases: for example, catch failure of decoding message.

Performance advantages: If too many interceptors are registered in a service, the interceptor chain can become too long, which increases the latency and processing time of the entire RPC call.

@pellared pellared changed the title otelgrpc: Deprecate interceptors in favor of stats handlers [DoNotMerge] otelgrpc: Deprecate interceptors in favor of stats handlers Nov 7, 2023
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pellared commented Nov 7, 2023

@fatsheep9146 Could you please review this PR?

@pellared pellared marked this pull request as ready for review November 8, 2023 16:56
@pellared pellared requested a review from a team November 8, 2023 16:56
@pellared pellared changed the title [DoNotMerge] otelgrpc: Deprecate interceptors in favor of stats handlers otelgrpc: Deprecate interceptors in favor of stats handlers Nov 8, 2023
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codecov bot commented Nov 8, 2023

Codecov Report

Merging #4534 (245089d) into main (a3b16ae) will decrease coverage by 0.1%.
The diff coverage is n/a.

Impacted file tree graph

@@           Coverage Diff           @@
##            main   #4534     +/-   ##
=======================================
- Coverage   80.8%   80.8%   -0.1%     
=======================================
  Files        150     150             
  Lines      10371   10371             
=======================================
- Hits        8387    8384      -3     
- Misses      1840    1842      +2     
- Partials     144     145      +1     
Files Coverage Δ
...entation/google.golang.org/grpc/otelgrpc/config.go 69.6% <ø> (ø)
...ion/google.golang.org/grpc/otelgrpc/interceptor.go 87.0% <ø> (-0.8%) ⬇️

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otelgrpc: Deprecate the interceptors
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