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embed: add GRPCAdditionalServerOptions config #14066

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Jun 21, 2024
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@rleungx rleungx commented May 23, 2022

This PR introduces GRPCAdditionalServerOptions which allow changing the internal gRPC settings. Sometimes, we may register our own gRPC service into etcd and change the max-request-bytes might affect the internal etcd logic.

@rleungx rleungx marked this pull request as ready for review May 23, 2022 10:58
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codecov-commenter commented May 24, 2022

Codecov Report

Merging #14066 (5d6a29d) into main (a1405e9) will decrease coverage by 0.33%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #14066      +/-   ##
==========================================
- Coverage   75.60%   75.27%   -0.34%     
==========================================
  Files         457      457              
  Lines       37084    37117      +33     
==========================================
- Hits        28038    27939      -99     
- Misses       7312     7414     +102     
- Partials     1734     1764      +30     
Flag Coverage Δ
all 75.27% <100.00%> (-0.34%) ⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files Coverage Δ
server/embed/config.go 73.40% <ø> (ø)
server/embed/etcd.go 75.38% <100.00%> (+0.04%) ⬆️
server/etcdserver/api/membership/store.go 50.00% <0.00%> (-10.00%) ⬇️
server/storage/mvcc/watchable_store.go 84.42% <0.00%> (-8.34%) ⬇️
client/pkg/v3/fileutil/purge.go 66.03% <0.00%> (-7.55%) ⬇️
api/v3rpc/rpctypes/error.go 84.61% <0.00%> (-5.87%) ⬇️
client/v3/experimental/recipes/key.go 75.34% <0.00%> (-5.48%) ⬇️
server/lease/lease.go 94.87% <0.00%> (-5.13%) ⬇️
raft/rafttest/node.go 95.00% <0.00%> (-5.00%) ⬇️
client/v3/leasing/cache.go 87.77% <0.00%> (-3.89%) ⬇️
... and 19 more

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ahrtr commented May 25, 2022

Comments:

  1. What do you mean by Sometimes, we may register our own gRPC service into etcd? Could you explain this?
  2. Why you do not expose the two items? i.e. config.go#L132

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rleungx commented May 25, 2022

Comments:

  1. What do you mean by Sometimes, we may register our own gRPC service into etcd? Could you explain this?
  2. Why you do not expose the two items? i.e. config.go#L132
  1. See

    etcd/server/embed/config.go

    Lines 302 to 309 in bfb9aa4

    // ServiceRegister is for registering users' gRPC services. A simple usage example:
    // cfg := embed.NewConfig()
    // cfg.ServerRegister = func(s *grpc.Server) {
    // pb.RegisterFooServer(s, &fooServer{})
    // pb.RegisterBarServer(s, &barServer{})
    // }
    // embed.StartEtcd(cfg)
    ServiceRegister func(*grpc.Server) `json:"-"`
  2. I can also expose them if you want.

@@ -66,8 +62,8 @@ func Server(s *etcdserver.EtcdServer, tls *tls.Config, interceptor grpc.UnarySer
opts = append(opts, grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(chainUnaryInterceptors...)))
opts = append(opts, grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(chainStreamInterceptors...)))

opts = append(opts, grpc.MaxRecvMsgSize(int(s.Cfg.MaxRequestBytes+grpcOverheadBytes)))
opts = append(opts, grpc.MaxSendMsgSize(maxSendBytes))
opts = append(opts, grpc.MaxRecvMsgSize(s.Cfg.MaxRecvMsgSize))
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What if MaxRequestBytes is different from s.Cfg.MaxRecvMsgSize? If you configure a big value for s.Cfg.MaxRecvMsgSize, i.e. 10MB, while the MaxRequestBytes is 1 MB, then etcdserver may still reject the request.

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Do you mean MaxRecvMsgSize should be larger or equal to MaxRequestBytes?

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I don't see any reason to add the two parameters.

Did you see any issue without adding MaxRecvMsgSize/MaxSendMsgSize?

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Actually, we have a feature that needs to change MaxRecvMsgSize to 150M. I was wondering if etcd can offer a separate config to customize it without changing MaxRequestBytes. For now, when we start a cluster, it will give a warning about the MaxRequestBytes exceeds the recommended size.

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A couple of comments:

  1. etcd is designed to serve small metadata. Why do you need to change MaxRecvMsgSize to 150M? Can you elaborate your use case?
  2. Have you verified your case based on this PR with MaxRecvMsgSize being set to 150M, while keep --max-request-bytes unchanged?

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Any update on this?

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Sorry for the late reply.

  1. etcd is designed to serve small metadata. Why do you need to change MaxRecvMsgSize to 150M? Can you elaborate your use case?

We will register our service into the embed etcd. See https://github.com/tikv/pd/blob/0d05fba64372408c5af9a78cd9b47b58c4925ca9/server/server.go#L277-L280. For example, the store heartbeat https://github.com/tikv/pd/blob/0d05fba64372408c5af9a78cd9b47b58c4925ca9/server/grpc_service.go#L570.When we need to recover our cluster, the heartbeat request will bring the meta of data, which could be large. We utilize the meta to decide which part of the data should be recovered.

  1. Have you verified your case based on this PR with MaxRecvMsgSize being set to 150M, while keep --max-request-bytes unchanged?

not yet

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I would consider registering a hook to alter the grpc options as part of the config:

func additionalGrpcServerOptions() grpc.ServerOption[]

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Actually:

   grpcAdditionalServerOptions grpc.ServerOption[]

in the config would do the trick.

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grpcAdditionalServerOptions grpc.ServerOption[]

@@ -129,6 +129,11 @@ type ServerConfig struct {
// MaxRequestBytes is the maximum request size to send over raft.
MaxRequestBytes uint

// MaxRecvMsgSize is the max gRPC message size in bytes the server can receive.
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How about adding
grpcAdditionalServerOptions grpc.ServerOption[] as a generic options instead ?

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ahrtr commented Jun 13, 2022

@ptabor One item in my to do list is to sort out all the thresholds in etcd, including this one. Will discuss this in a separate session once my current task of refactoring lease is done.

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ptabor commented Jun 14, 2022

@ptabor One item in my to do list is to sort out all the thresholds in etcd, including this one. Will discuss this in a separate session once my current task of refactoring lease is done.

@ahrtr As this sound as a snowflake use-case (grpc shared between etcd and other service), I think we should not be in the business of looking at the limits... and allow programmers (only in embed server) to pass additional grpc settings, that etcd passes-through.

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ahrtr commented Jun 15, 2022

@ahrtr As this sound as a snowflake use-case (grpc shared between etcd and other service), I think we should not be in the business of looking at the limits... and allow programmers (only in embed server) to pass additional grpc settings, that etcd passes-through.

Overall adding a generic grpcAdditionalServerOptions grpc.ServerOption[] looks good to me. But it doesn't resolve the concern that it may have impact on the build-in services provided by etcd itself.

The good side is flexibility, because users can set any additional options they want. The down side is it may have impact on the gRPC service provided by etcd itself.

Another perspective to think about this is that we should take all services, including etcd build-in services and users registered services, under control. Once users see any issue for the embedded etcd, they will also raise issue in etcd community. Based on the principle of equal responsibility and obligation, If we need to support such case, then we should can add more restriction on the services registered by users, instead of just providing flexibility without any restriction. So users shouldn't set any additional options, instead they should follow all the existing options from this perspective.

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ahrtr commented Jun 15, 2022

The new feature of ServiceRegister was introduced in pull/7215.

Again, the good side of the PR is users can reuse the same port as etcd. But the bad side is it introduces additional unnecessary complexity to etcd. Personally I don't like the PR ( I mean 7215), and the better choice should be resolving it out of the box (such as providing a proxy/gateway in front of embedded etcd and users' gRPC service) instead of hacking etcd itself.

@rleungx rleungx changed the title embed: add MaxRecvMsgSize/MaxSendMsgSize config embed: add GRPCAdditionalServerOptions config Jun 15, 2022
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rleungx commented Jun 15, 2022

@ahrtr As this sound as a snowflake use-case (grpc shared between etcd and other service), I think we should not be in the business of looking at the limits... and allow programmers (only in embed server) to pass additional grpc settings, that etcd passes-through.

Overall adding a generic grpcAdditionalServerOptions grpc.ServerOption[] looks good to me. But it doesn't resolve the concern that it may have impact on the build-in services provided by etcd itself.

The good side is flexibility, because users can set any additional options they want. The down side is it may have impact on the gRPC service provided by etcd itself.

Another perspective to think about this is that we should take all services, including etcd build-in services and users registered services, under control. Once users see any issue for the embedded etcd, they will also raise issue in etcd community. Based on the principle of equal responsibility and obligation, If we need to support such case, then we should can add more restriction on the services registered by users, instead of just providing flexibility without any restriction. So users shouldn't set any additional options, instead they should follow all the existing options from this perspective.

IMO, no matter if it's a requirement of user-defined services, we still need to provide the ability to change the default gRPC settings.

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rleungx commented Jun 15, 2022

Besides, supporting the custom interceptor for embed etcd is another need. See #13468

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ahrtr commented Jun 17, 2022

Note that the users registered service and the etcd build-in gRPC services share the same gRPC channel. Any options will have impact on both of them.

Please just use the existing flag --max-request-bytes to change the MaxRecvSize. Do you need to change the MaxSendSize in your case?

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nolouch commented Jun 20, 2022

Hi @ahrtr
#7215 not allow users to define gRPC's setting, I think this PR is to improve it.

We have some requirements with the embed etcd use-case, not only max-request-bytes :

  • register own service in etcd, and we want to protect with those services, but etcd's service may influence it (some client directly use etcd service), so we need QoS features. But same as the issue comment says, it suggests this can be simply implemented as a gRPC server middleware, and keep etcd as minimal as possible, but we cannot use custom gRPC server middleware
  • Fixed parameters bring some inconvenience because it is not extensible, we need to add supported parameters to etcd first, and then wait for it release to the stable version, and then update the dependencies. This time period is too long.

IMO, embed etcd users need to be responsible for changing etcd parameters, this does not affect normal etcd users(standalone process). So hopefully this PR will be approved, it is more convenient for embed etcd users. ptal @ahrtr @ptabor, Thanks.

@@ -719,6 +719,7 @@ func (e *Etcd) serveClients() (err error) {
Time: e.cfg.GRPCKeepAliveInterval,
Timeout: e.cfg.GRPCKeepAliveTimeout,
}))
gopts = append(gopts, e.cfg.GRPCAdditionalServerOptions...)
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Does it need to move out this if statement?

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+1

@@ -719,6 +719,7 @@ func (e *Etcd) serveClients() (err error) {
Time: e.cfg.GRPCKeepAliveInterval,
Timeout: e.cfg.GRPCKeepAliveTimeout,
}))
gopts = append(gopts, e.cfg.GRPCAdditionalServerOptions...)
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+1

GrpcURL string
GrpcBridge *bridge
GrpcServerOpts []grpc.ServerOption
GrpcAdditionalServerOpts []grpc.ServerOption
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Do we really need it here ?

I think that MustNewMember could just propagate MemberConfig.GrpcAdditionalServerOpts into GrpcServerOpts and not store it here explicitly.

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ahrtr commented Jun 22, 2022

Hi @ahrtr #7215 not allow users to define gRPC's setting, I think this PR is to improve it.

We have some requirements with the embed etcd use-case, not only max-request-bytes :

* register own service in etcd, and we want to protect with those services, but etcd's service may influence it (some client directly use etcd service), so we need `QoS features`. But same as the [issue comment](https://github.com/etcd-io/etcd/pull/12290#issuecomment-697060195) says, it suggests this can be simply implemented as a gRPC server middleware, and keep etcd as minimal as possible, but we cannot use custom gRPC server middleware

* Fixed parameters bring some inconvenience because it is not extensible, we need to add supported parameters to etcd first, and then wait for it release to the stable version, and then update the dependencies. This time period is too long.

IMO, embed etcd users need to be responsible for changing etcd parameters, this does not affect normal etcd users(standalone process). So hopefully this PR will be approved, it is more convenient for embed etcd users. ptal @ahrtr @ptabor, Thanks.

I am still not convinced that we really need to add grpcAdditionalServerOptions grpc.ServerOption[]. I am not saying we shouldn't add it, instead I am just trying to say that we shouldn't add any new feature without a deep understanding the use cases beforehand. So please elaborate your use cases firstly. Why do you need it, and how will use it after adding it? Specifically, what gRPC options are you going to add via the grpcAdditionalServerOptions?

Note that there are several QoS related PRs, but none of them is merged so far. If your discussion is based on the QoS feature, then it isn't valid at the moment.

More flexibility also means more chance to make mistake. If there is no any strong incentive or reasonable benefit, then we shouldn't add it.

Please also make sure you well understood my previous two comments, issuecomment-1155881593 and issuecomment-1155894742

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ptabor commented Jun 22, 2022

@ahrtr:

  1. I'm not insisting on merging, this... just steering towards such variant rather than explosion of custom options.

  2. A use-case is linked from: embed: add GRPCAdditionalServerOptions config #14066 (comment), and seems direct consequence of allowing embed server to have custom customer's services being used. I think usage of embedded service put's a high bar on customer to have proper testing for their integrated solution. We should document this requirement more explicitly.

  3. I was hoping (but seems not possible currently) that we could perform validation of different constants/limit post-grpc server start, It's run it and obtain the effective config. Unfortunately grpc does not exposes the resolved configuration of running server publicly:

https://github.com/grpc/grpc-go/blob/28de4866ce7440b675662abbdd5c43b476bd4dae/server.go#L124

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ahrtr commented Jun 23, 2022

Thanks @ptabor for the feedback.

I read the 14066#discussion_r887444999 before. etcd has already supported users registering custom service. If users need to configure the max request size, we already have MaxRequestBytes (MaxRecvMsgSize). If users need MaxSendMsgSize as well, we can add it (the default value is math.MaxInt32, do we really need to expose it?). Apart from that, are there any other options users might need?

FYI. there is a on-going PR 14081 for the MaxConcurrentStreams.

There are 24 options in total which are supported by gRPC 1.47 for now, see server.go#L143-L168 . Currently etcd exposes about half of them. Some options/API (such as InTapHandle, ConnectionTimeout, HeaderTableSize and NumStreamWorkers) are still experimental, which probably I don't think are proper to expose to etcd users. For other options (such as RPCCompressor, RPCDecompressor, InitialWindowSize, InitialConnWindowSize, WriteBufferSize and ReadBufferSize) which etcd hasn't exposed yet, I am not sure whether we should expose them. Personally I don't think it's good to just expose them all without deep understanding and full testing ourselves (the community) beforehand, and we do not receive real request on these so far.

  1. I'm not insisting on merging, this... just steering towards such variant rather than explosion of custom options.

The number of options will not explode. Please see my comment above.

  1. I think usage of embedded service put's a high bar on customer to have proper testing for their integrated solution. We should document this requirement more explicitly.

This might be a valid point.

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rleungx commented Jun 23, 2022

@ahrtr @ptabor Thanks for your reply. #14066 (comment) make sense to me. But for now, we indeed have two requirements:

  1. support changing the MaxRecvMsgSize which can be replaced by changing max-request-bytes. It doesn't well conform to semantics but it works. I'm ok with the current usage.
  2. support adding the custom gRPC interceptor for user-defined gRPC services so we can add our logic to intercept the request and do something, e.g. the QoS feature or forwarding requests. But etcd doesn't support it at the moment.

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nolouch commented Jun 23, 2022

@ahrtr

Once users see any issue for the embedded etcd, they will also raise issue in etcd community. Based on the principle of equal responsibility and obligation, If we need to support such case, then we should can add more restrictions on the services registered by users, instead of just providing flexibility without any restriction.

I don't think it's good to just expose them all without deep understanding and full testing ourselves (the community) beforehand

I have some questions:

  • Community can issue that and add the option if approve, as I said before, users need to wait a long time. on the other hand, how do restriction users not use the inappropriate option value that may affect etcd?
  • As you said, currently etcd exposes about half of 24 options, so about 12 options. Do all users really deep understand those 12 options and full testing by yourselves with all use cases?

I think there still have the same problems. so if the embed user wants to change the default parameters, they should understand it, and be responsible for it. that means users should test it and make sure it is suitable for themselves scenarios. As @ptabor said, we can document it.
And I don't think it introduces unnecessary complexity to etcd, etcd still keep minimal, and it's more flexibility, let user can extend etcd (such as grpc services and middlewares), and also it only affects embed users.

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nolouch commented Jun 23, 2022

BTW, If you really concert about it, I think etcd embed model should be more like a library, it can be as a service be registered to a custom grpc server rather than let itself as a server.

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ahrtr commented Aug 8, 2022

I am OK to revisit this PR, but it needs at least three maintainers' approval.

@rleungx rleungx force-pushed the add-config branch 4 times, most recently from 9f9ce3f to 6a6b493 Compare August 9, 2022 06:14
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ahrtr commented Jun 6, 2024

Friendly ping @ahrtr

Sorry for the late response. Please rebase this PR.

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rleungx commented Jun 7, 2024

Friendly ping @ahrtr

Sorry for the late response. Please rebase this PR.

done

Comment on lines 287 to 288
// GRPCAdditionalServerOptions is the additional server option hook
// for changing the default internal gRPC configuration.
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Suggested change
// GRPCAdditionalServerOptions is the additional server option hook
// for changing the default internal gRPC configuration.
// GRPCAdditionalServerOptions is the additional server option hook
// for changing the default internal gRPC configuration. Note these
// additional configurations take precedence over the existing individual
// configurations if present. Please refer to
// https://github.com/etcd-io/etcd/pull/14066#issuecomment-1248682996

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done

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ahrtr commented Jun 8, 2024

Overall looks good to me. cc @fuweid @jmhbnz @serathius @tjungblu

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same. /lgtm

Signed-off-by: Ryan Leung <[email protected]>
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ahrtr commented Jun 12, 2024

@rleungx FYI. #18015 (comment)

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rleungx commented Jun 12, 2024

@rleungx FYI. #18015 (comment)

Got it.

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rleungx commented Jun 14, 2024

@ahrtr Is there anything I need to do to get this PR merged?

Comment on lines +287 to +292
// GRPCAdditionalServerOptions is the additional server option hook
// for changing the default internal gRPC configuration. Note these
// additional configurations take precedence over the existing individual
// configurations if present. Please refer to
// https://github.com/etcd-io/etcd/pull/14066#issuecomment-1248682996
GRPCAdditionalServerOptions []grpc.ServerOption `json:"grpc-additional-server-options"`
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It would be better if we also add a page under the https://etcd.io/docs/v3.5/dev-guide/ to document this. Can you raise a ticket in https://github.com/etcd-io/website/issues?

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ahrtr commented Jun 14, 2024

cc @fuweid @ivanvc @jmhbnz @serathius

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I've been reviewing this pull request back and forth. The implementation looks good. But I see some previous discussion about whether this is a feature we want to bring or not. It seems like the latest is that there is a consensus. Maybe it would be good to hear from other team members, too.

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Thanks for the work on this @rleungx.

Given this is a more complex configuration option I suggest adding a commented out example in https://github.com/etcd-io/etcd/blob/main/etcd.conf.yml.sample showing how this option could be configured via configuration file if desired.

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ahrtr commented Jun 19, 2024

Thanks for the work on this @rleungx.

Given this is a more complex configuration option I suggest adding a commented out example in https://github.com/etcd-io/etcd/blob/main/etcd.conf.yml.sample showing how this option could be configured via configuration file if desired.

The new option is only for the embedded use case. Users won't be able to configure it through the command line or config file.

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Thanks for clarification @ahrtr.

LGTM

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ahrtr commented Jun 19, 2024

Please also update changelog-3.6, which can be done in a separate PR. @rleungx

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rleungx commented Jun 19, 2024

Please also update changelog-3.6, which can be done in a separate PR. @rleungx

Sure. Once it is merged, I will raise another PR to update it.

@ahrtr ahrtr merged commit 1d13fc5 into etcd-io:main Jun 21, 2024
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@rleungx rleungx deleted the add-config branch June 21, 2024 09:09
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okJiang commented Aug 7, 2024

@ahrtr Sorry to bother you, can this PR accept a pick back to 3.5? I can submit a PR for review. Any suggestions are valuable to me.

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ahrtr commented Aug 7, 2024

@ahrtr Sorry to bother you, can this PR accept a pick back to 3.5? I can submit a PR for review. Any suggestions are valuable to me.

We may not backport this (feature) to stable release without strong justification.

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