Change subchannel BalancerAddress when attributes change #2228
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@JamesNK hi. And why is the work on this PR not moving? |
mgravell
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| @@ -38,20 +38,22 @@ public sealed class BalancerAttributes : IDictionary<string, object?>, IReadOnly | |||
| /// <summary> | |||
| /// Gets a read-only collection of metadata attributes. | |||
| /// </summary> | |||
| public static readonly BalancerAttributes Empty = new BalancerAttributes(new ReadOnlyDictionary<string, object?>(new Dictionary<string, object?>())); | |||
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you cite performance as the reason for this change; I would be genuinely surprized if Dictionary<string,object? out-performed ReadOnlyDictionary<string,object?> except on the custom struct iterator - but if perf is key, I also wonder whether we should be looking to FrozenDictionary<string, object?> on TFMs where it is available, via #if; is there data behind this change? If the enumerator is the big difference, FrozenDictrionary<string,object?> has a custom iterator too, and foreach isn't a common scenario on dictionary, usually
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The performance gain isn't Dictionary vs ReadOnlyDictionary. The performance gain is from consistently referencing the values as Dictionary instead of IDictionary.
Using Dictionary avoids interface overhead and allows foreach over the dictionary without allocating.
src/Grpc.Net.Client/Balancer/Internal/BalancerAddressEqualityComparer.cs
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@kalduzov please blame me for that; review comments now added |
All OK. It’s just that the previous PRs were quickly reviewed, and this is just silence. We are very much looking forward to this change. Without it, all our written balancing code does not work :( |
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because I like data, I did this: https://gist.github.com/mgravell/61c3a892020860a87a3b6cb3ad1687a5 short version: for key lookup ( |
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oguzhand95
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[](https://renovatebot.com) This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [Google.Protobuf](https://togithub.com/protocolbuffers/protobuf) | nuget | patch | `3.24.2` -> `3.24.3` | | [Grpc.Net.Client](https://togithub.com/grpc/grpc-dotnet) | nuget | minor | `2.56.0` -> `2.57.0` | | [Testcontainers](https://dotnet.testcontainers.org/) ([source](https://togithub.com/testcontainers/testcontainers-dotnet)) | nuget | minor | `3.4.0` -> `3.5.0` | --- ### Release Notes <details> <summary>protocolbuffers/protobuf (Google.Protobuf)</summary> ### [`v3.24.3`](https://togithub.com/protocolbuffers/protobuf/compare/v3.24.2...v3.24.3) </details> <details> <summary>grpc/grpc-dotnet (Grpc.Net.Client)</summary> ### [`v2.57.0`](https://togithub.com/grpc/grpc-dotnet/releases/tag/v2.57.0) #### What's Changed - Start 2.57.x development cycle by [@​jtattermusch](https://togithub.com/jtattermusch) in [https://github.com/grpc/grpc-dotnet/pull/2227](https://togithub.com/grpc/grpc-dotnet/pull/2227) - Validate Windows version when using WinHttpHandler by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2229](https://togithub.com/grpc/grpc-dotnet/pull/2229) - Support infinite idle connection timeout values by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2231](https://togithub.com/grpc/grpc-dotnet/pull/2231) - Improve BalancerAttributes debugging by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2235](https://togithub.com/grpc/grpc-dotnet/pull/2235) - Update Grpc.Net.Client to remove ValueTask usage by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2222](https://togithub.com/grpc/grpc-dotnet/pull/2222) - Update Newtonsoft.Json to 13.0.3 by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2219](https://togithub.com/grpc/grpc-dotnet/pull/2219) - Consistently don't log message errors on cancellation by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2221](https://togithub.com/grpc/grpc-dotnet/pull/2221) - Fix load balancing flaky test by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2223](https://togithub.com/grpc/grpc-dotnet/pull/2223) - Improve comment in GrpcChannel for WinHttpHandler + OS validation by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2237](https://togithub.com/grpc/grpc-dotnet/pull/2237) - Update OS version detection to get version directly from Windows by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2239](https://togithub.com/grpc/grpc-dotnet/pull/2239) - Update implementation_comparison.md by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2240](https://togithub.com/grpc/grpc-dotnet/pull/2240) - Update to use .NET 8 by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2021](https://togithub.com/grpc/grpc-dotnet/pull/2021) - Bump semver from 6.3.0 to 6.3.1 in /testassets/InteropTestsGrpcWebWebsite/Tests by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/grpc/grpc-dotnet/pull/2243](https://togithub.com/grpc/grpc-dotnet/pull/2243) - Force yielding after awaiting CallTask to avoid holding onto locks by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2245](https://togithub.com/grpc/grpc-dotnet/pull/2245) - Update Grpc.Net.Client to use ActivitySource by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2244](https://togithub.com/grpc/grpc-dotnet/pull/2244) - Clear IAsyncStreamReader<T>.Current value before reading next value by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2248](https://togithub.com/grpc/grpc-dotnet/pull/2248) - Upgrade QpsWorker to net8 by [@​jtattermusch](https://togithub.com/jtattermusch) in [https://github.com/grpc/grpc-dotnet/pull/2250](https://togithub.com/grpc/grpc-dotnet/pull/2250) - Change subchannel ID to include a channel ID by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2253](https://togithub.com/grpc/grpc-dotnet/pull/2253) - Update Grpc.Tools dependency to 2.57.0 by [@​jtattermusch](https://togithub.com/jtattermusch) in [https://github.com/grpc/grpc-dotnet/pull/2257](https://togithub.com/grpc/grpc-dotnet/pull/2257) - Add transport status to subchannel picked log by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2261](https://togithub.com/grpc/grpc-dotnet/pull/2261) - Reduce logger allocations by not using generic CreateLogger by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2256](https://togithub.com/grpc/grpc-dotnet/pull/2256) - Update call debugger display to show status code by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2259](https://togithub.com/grpc/grpc-dotnet/pull/2259) - Log socket lifetime when closing unusable sockets by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2258](https://togithub.com/grpc/grpc-dotnet/pull/2258) - Fix unobserved exceptions with retries by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2255](https://togithub.com/grpc/grpc-dotnet/pull/2255) - Change subchannel BalancerAddress when attributes change by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2228](https://togithub.com/grpc/grpc-dotnet/pull/2228) - Fix connection bugs from BalancerAddress changes by [@​JamesNK](https://togithub.com/JamesNK) in [https://github.com/grpc/grpc-dotnet/pull/2265](https://togithub.com/grpc/grpc-dotnet/pull/2265) - \[v2.57.x] Update version to 2.57.0-pre1 by [@​jtattermusch](https://togithub.com/jtattermusch) in [https://github.com/grpc/grpc-dotnet/pull/2266](https://togithub.com/grpc/grpc-dotnet/pull/2266) - \[2.57.x] Update version to 2.57.0 by [@​jtattermusch](https://togithub.com/jtattermusch) in [https://github.com/grpc/grpc-dotnet/pull/2272](https://togithub.com/grpc/grpc-dotnet/pull/2272) **Full Changelog**: grpc/grpc-dotnet@v2.56.0...v2.57.0 </details> <details> <summary>testcontainers/testcontainers-dotnet (Testcontainers)</summary> ### [`v3.5.0`](https://togithub.com/testcontainers/testcontainers-dotnet/releases/tag/3.5.0) [Compare Source](https://togithub.com/testcontainers/testcontainers-dotnet/compare/3.4.0...3.5.0) ### What's Changed #### 🚀 Features - feat: Allow MongoDb module configuration without credentials ([#​983](https://togithub.com/testcontainers/testcontainers-dotnet/issues/983)) [@​the-avid-engineer](https://togithub.com/the-avid-engineer) - 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Fixes #2225
This PR:
BalancerAttributesare stored to always useDictionary<string, object>. This is to improve comparison performance.BalancerAttributes.DnsEndPoint. The endpoint is then used to look up the balancer attributes to use in the subchannel.DnsEndPointinstead ofBalancerAttributesin all logs.BalancerAddresswith different attributes replaces the address on the subchannel. If the subchannel has an open connection, it stays open.cc @kalduzov