Allow user to separate http and grpc server #15446

serathius · 2023-03-10T16:41:16Z

Phase 2 of #15402 (comment)
Adding a flag to separate http server. No changes in default so the PR can be backported.

Difference in load configuration for watch delay tests show how huge the
impact is. Even with random write scheduler grpc under http
server can only handle 500 KB with 2 seconds delay. On the other hand,
separate grpc server easily hits 10, 100 or even 1000 MB within 100 miliseconds.

Priority write scheduler that was used in most previous releases
is far worse than random one.

Tests configured to only 10 MB to avoid them taking too long to fill
etcd.

cc @ahrtr @ptabor @spzala @fuweid @aojea

serathius · 2023-03-10T16:41:50Z

Making as draft as I still need to implement more tests

server/embed/serve.go

ahrtr · 2023-03-12T10:23:47Z

A quick comment: suggest to extract the first commit into a separate PR, so that we can approve & merge it firstly.

ahrtr · 2023-03-13T03:31:33Z

I believe adding a new user facing flag "--listen-client-http-urls" can resolve #15402. But it also changes user behavior. All users have adapted the behavior of 2379 for all clients connection/request, and 2380 for peer requests. Now users have to add add a new port (e.g. 2381) for all http client requests (e.g. /health, /metrics, etc.). I think it's a non-trivial change, and we should get more feedback before we start to make change.

From users perspective, I think it still makes sense to multiplex both gRPC and HTTP (including 1 and 2) using one port (2379), and personally I think it should still be the long-term goal.

gRPC-go has always been a pain point in etcd, which is still depending on some experimental APIs right now (see #15145), one of which is grpcServer.ServeHTTP.

I think

it would be great if this issue can be resolved by network layer instead of etcd?
or we follow this PR for now and eventually revert to the behavior of multiplexing gRPC and HTTP in one port for all client connection/requests in the future when network layer resolves such issue?
or follow the solution similar to etcdserver: create separate goroutine to accept grpc tls connection #15451?

We (most etcd contributors) are not network (e.g. gRPC, golang.org/x/net, etc) experts, so it would be great if we can get more feedback from network experts. cc @dfawley @aojea

ahrtr · 2023-03-13T03:33:04Z

cc K8s folks @liggitt @dims @nikhita @neolit123 @wojtek-t

serathius · 2023-03-13T09:31:04Z

Please let's move discussion to the original issue #15402 where this design was approved by @ptab, @mborsz and @aojea.

The change is non-trivial, but everyone I talked to agreed that this is the correct long-term direction. GRPC and http should not be mixed, @aojea even called it "an abomination".

aojea · 2023-03-13T09:38:25Z

GRPC and http should not be mixed, @aojea even called it "an abomination".

well, I just was trying to add some drama 😄 , but you can see similar comments from its own author grpc/grpc-go#586 (comment) in this issue that comments about the performance regression of using ServeHTTP

And I don't officially work on grpc-go. It's not surprising that ServeHTTP is slower considering it's shoehorned into the existing ServerTransport interface somewhat awkwardly.

and on the documentation it is still considered Experimental

https://pkg.go.dev/google.golang.org/grpc#Server.ServeHTTP

ptabor · 2023-03-13T11:20:17Z

@ahrtr - I agree that all changes requiring action from customers are difficult and should go through a deep consideration.

I think that this PR is not yet controversial and not introducing the breaking change. It's just adding new
(safe) mode of operation.
The breaking change (changing default) will be a follow up PR... that will not be backported. Users will have both v3.4 and v3.5 to gracefully migrated to the new safer semantic and only in v3.6 (or later) we will change the default.
Etcd minor releases are so in frequent that we do use it as a train to ship breaking changes when they are justified by project's robustness or security.

server/embed/config.go

serathius · 2023-03-17T10:01:33Z

Hmm cmux test failure ?!

2023-03-16T16:56:35.0274754Z --- FAIL: TestConnectionMultiplexing (13.68s)
2023-03-16T16:56:35.0275287Z     before.go:36: Changing working directory to: /tmp/TestConnectionMultiplexing1002003079/001
2023-03-16T16:56:35.0275898Z     --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS (11.68s)
2023-03-16T16:56:35.0276887Z         logger.go:130: 2023-03-16T16:46:10.486Z	INFO	starting server...	{"name": "TestConnectionMultiplexingServerTLSAndNonTLS-test-0"}
2023-03-16T16:56:35.0284372Z         logger.go:130: 2023-03-16T16:46:10.487Z	INFO	spawning process	{"args": ["/home/runner/work/etcd/etcd/bin/etcd", "--name", "TestConnectionMultiplexingServerTLSAndNonTLS-test-0", "--listen-client-urls", "http://localhost:20000,https://localhost:20000", "--advertise-client-urls", "http://localhost:20000,https://localhost:20000", "--listen-peer-urls", "http://localhost:20001", "--initial-advertise-peer-urls", "http://localhost:20001", "--initial-cluster-token", "", "--data-dir", "/tmp/TestConnectionMultiplexingServerTLSAndNonTLS4257936873/001", "--snapshot-count", "10000", "--strict-reconfig-check=false", "--cert-file", "/home/runner/work/etcd/etcd/tests/fixtures/server.crt", "--key-file", "/home/runner/work/etcd/etcd/tests/fixtures/server.key.insecure", "--trusted-ca-file", "/home/runner/work/etcd/etcd/tests/fixtures/ca.crt", "--initial-cluster", "TestConnectionMultiplexingServerTLSAndNonTLS-test-0=http://localhost:20001", "--initial-cluster-state", "new"], "working-dir": "/tmp/TestConnectionMultiplexing1002003079/001", "name": "TestConnectionMultiplexingServerTLSAndNonTLS-test-0", "environment-variables": ["ETCD_VERIFY=all", "EXPECT_DEBUG=true", "PATH=/opt/hostedtoolcache/go/1.19.7/x64/bin:/home/runner/go/bin:/opt/hostedtoolcache/go/1.19.7/x64/bin:/home/runner/.local/bin:/opt/pipx_bin:/home/runner/.cargo/bin:/home/runner/.config/composer/vendor/bin:/usr/local/.ghcup/bin:/home/runner/.dotnet/tools:/snap/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin", "ETCD_UNSUPPORTED_ARCH=386"]}
2023-03-16T16:56:35.0287532Z         logger.go:130: 2023-03-16T16:46:11.214Z	INFO	started server.	{"name": "TestConnectionMultiplexingServerTLSAndNonTLS-test-0", "pid": 10906}
2023-03-16T16:56:35.0288314Z         --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS (10.24s)
2023-03-16T16:56:35.0289249Z             --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS/etcdctl (5.02s)
2023-03-16T16:56:35.0289801Z                 cmux_test.go:101: 
2023-03-16T16:56:35.0290604Z                     	Error Trace:	/home/runner/work/etcd/etcd/tests/e2e/cmux_test.go:101
2023-03-16T16:56:35.0291609Z                     	Error:      	Received unexpected error:
2023-03-16T16:56:35.0294285Z                     	            	match not found.  Set EXPECT_DEBUG for more info Errs: [unexpected exit code [1] after running [/home/runner/work/etcd/etcd/bin/etcdctl --endpoints=http://localhost:20000 get a -w json -w json -w json]], last lines:
2023-03-16T16:56:35.0300027Z                     	            	{"level":"warn","ts":"2023-03-16T16:46:16.930432Z","logger":"etcd-client","caller":"[email protected]/retry_interceptor.go:65","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xaa00700/localhost:20000","method":"/etcdserverpb.KV/Range","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = latest balancer error: last connection error: connection error: desc = \"error reading server preface: read tcp 127.0.0.1:39924->127.0.0.1:20000: read: connection reset by peer\""}
2023-03-16T16:56:35.0301247Z                     	            	Error: context deadline exceeded
2023-03-16T16:56:35.0302107Z                     	Test:       	TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS/etcdctl
2023-03-16T16:56:35.0302942Z             --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS/clientv3 (5.00s)
2023-03-16T16:56:35.0303569Z                 utils.go:53: context deadline exceeded

Can't repro locally.

aojea · 2023-03-17T10:09:52Z

/cc

fuweid · 2023-03-17T10:15:34Z

Hmm cmux test failure ?!


2023-03-16T16:56:35.0274754Z --- FAIL: TestConnectionMultiplexing (13.68s)

2023-03-16T16:56:35.0275287Z     before.go:36: Changing working directory to: /tmp/TestConnectionMultiplexing1002003079/001

2023-03-16T16:56:35.0275898Z     --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS (11.68s)

2023-03-16T16:56:35.0276887Z         logger.go:130: 2023-03-16T16:46:10.486Z	INFO	starting server...	{"name": "TestConnectionMultiplexingServerTLSAndNonTLS-test-0"}

2023-03-16T16:56:35.0284372Z         logger.go:130: 2023-03-16T16:46:10.487Z	INFO	spawning process	{"args": ["/home/runner/work/etcd/etcd/bin/etcd", "--name", "TestConnectionMultiplexingServerTLSAndNonTLS-test-0", "--listen-client-urls", "http://localhost:20000,https://localhost:20000", "--advertise-client-urls", "http://localhost:20000,https://localhost:20000", "--listen-peer-urls", "http://localhost:20001", "--initial-advertise-peer-urls", "http://localhost:20001", "--initial-cluster-token", "", "--data-dir", "/tmp/TestConnectionMultiplexingServerTLSAndNonTLS4257936873/001", "--snapshot-count", "10000", "--strict-reconfig-check=false", "--cert-file", "/home/runner/work/etcd/etcd/tests/fixtures/server.crt", "--key-file", "/home/runner/work/etcd/etcd/tests/fixtures/server.key.insecure", "--trusted-ca-file", "/home/runner/work/etcd/etcd/tests/fixtures/ca.crt", "--initial-cluster", "TestConnectionMultiplexingServerTLSAndNonTLS-test-0=http://localhost:20001", "--initial-cluster-state", "new"], "working-dir": "/tmp/TestConnectionMultiplexing1002003079/001", "name": "TestConnectionMultiplexingServerTLSAndNonTLS-test-0", "environment-variables": ["ETCD_VERIFY=all", "EXPECT_DEBUG=true", "PATH=/opt/hostedtoolcache/go/1.19.7/x64/bin:/home/runner/go/bin:/opt/hostedtoolcache/go/1.19.7/x64/bin:/home/runner/.local/bin:/opt/pipx_bin:/home/runner/.cargo/bin:/home/runner/.config/composer/vendor/bin:/usr/local/.ghcup/bin:/home/runner/.dotnet/tools:/snap/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin", "ETCD_UNSUPPORTED_ARCH=386"]}

2023-03-16T16:56:35.0287532Z         logger.go:130: 2023-03-16T16:46:11.214Z	INFO	started server.	{"name": "TestConnectionMultiplexingServerTLSAndNonTLS-test-0", "pid": 10906}

2023-03-16T16:56:35.0288314Z         --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS (10.24s)

2023-03-16T16:56:35.0289249Z             --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS/etcdctl (5.02s)

2023-03-16T16:56:35.0289801Z                 cmux_test.go:101: 

2023-03-16T16:56:35.0290604Z                     	Error Trace:	/home/runner/work/etcd/etcd/tests/e2e/cmux_test.go:101

2023-03-16T16:56:35.0291609Z                     	Error:      	Received unexpected error:

2023-03-16T16:56:35.0294285Z                     	            	match not found.  Set EXPECT_DEBUG for more info Errs: [unexpected exit code [1] after running [/home/runner/work/etcd/etcd/bin/etcdctl --endpoints=http://localhost:20000 get a -w json -w json -w json]], last lines:

2023-03-16T16:56:35.0300027Z                     	            	{"level":"warn","ts":"2023-03-16T16:46:16.930432Z","logger":"etcd-client","caller":"[email protected]/retry_interceptor.go:65","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xaa00700/localhost:20000","method":"/etcdserverpb.KV/Range","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = latest balancer error: last connection error: connection error: desc = \"error reading server preface: read tcp 127.0.0.1:39924->127.0.0.1:20000: read: connection reset by peer\""}

2023-03-16T16:56:35.0301247Z                     	            	Error: context deadline exceeded

2023-03-16T16:56:35.0302107Z                     	Test:       	TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS/etcdctl

2023-03-16T16:56:35.0302942Z             --- FAIL: TestConnectionMultiplexing/ServerTLSAndNonTLS/ClientNonTLS/clientv3 (5.00s)

2023-03-16T16:56:35.0303569Z                 utils.go:53: context deadline exceeded

Can't repro locally.

I think I run into this as well. https://github.com/etcd-io/etcd/actions/runs/4439049893/jobs/7790956875.

serathius · 2023-03-17T10:21:01Z

@fuweid Thanks for confirming. Looks like a flake :(
Will file an issue to investigate it.

fuweid · 2023-03-17T10:22:13Z

@fuweid Thanks for confirming. Looks like a flake :(

Will file an issue to investigate it.

If no one takes it, please assign it to me. Thanks~ 🤓

serathius · 2023-03-17T10:24:13Z

@fuweid Thanks for confirming. Looks like a flake :(
Will file an issue to investigate it.

If no one takes it, please assign it to me. Thanks~ nerd_face

I just added the test :(, so let me take responsibility.

serathius · 2023-03-28T14:38:15Z

Addressed all feedback, please take another look @ahrtr @ptabor

server/etcdmain/config.go

server/embed/config.go

chaochn47 · 2023-03-28T21:38:15Z

server/embed/etcd.go

+		}
+
+		sctx := sctxs[addr]
+		if sctx == nil {


It's strange but it is the status quo...

chaochn47 · 2023-03-28T21:44:21Z

server/embed/etcd.go

 		// net.Listener will rewrite ipv4 0.0.0.0 to ipv6 [::], breaking
 		// hosts that disable ipv6. So, use the address given by the user.


Should the comment also be moved up to the appropriate location?

Not sure what this comment refers to. I didn't move it.

It was introduced by #8221 to fix the grpc gateway creating grpc connections using [::] caused by sctx.listener.addr() when ipv6 is disabled but user configures 0.0.0.0 as listen client urls.

I think we can leave it as it is right now and improve it later.

tests/e2e/cmux_test.go

tests/framework/e2e/cluster.go

ahrtr · 2023-03-29T03:25:17Z

I think that this PR is not yet controversial

@ptabor
That's the concern, because of no counter-question. I still think it makes sense to expose only one port (e.g. 2379) to clients from users perspective. Users shouldn't care about gRPC or HTTP. I am not a network expert, and no extra bandwidth to have a deep dive either. But happy to see @aojea keeps trying #15510, I may spend some time on it in future.

Anyway, I agree this PR is the best choice for 3.4 and 3.5, and overall looks good. Great work! @serathius . (Please resolve the couple of minor comments from @chaochn47 )

serathius · 2023-03-29T09:58:01Z

I still think it makes sense to expose only one port (e.g. 2379) to clients from users perspective. Users shouldn't care about gRPC or HTTP.

Overall it's good for simplicity, however I don't think this should apply in this case. Aside http v2 and grpcgateway APIs that should be removed, all remaining http endpoints are administrative and users should not care about them.

Please think in terms different user personas, user that connects to etcd in their application and administrator that manages the etcd (healthchecks, upgrades, etc) it could be a human or automated operator. With this in mind it seems not only unnecessary but also wrong to mix client and administrative endpoints. As an administrator I would prefer to bind hide administrative endpoints from external traffic by binding them to local address.

I don't think this was discussed before as etcd API is usually already well protected with access requiring mtls. Still I think it's worth to consider starting an effort to clean up etcd API and have those personal in mind. If there is any API (maybe version) that is useful for users, it should have it's alternative in grpc. If there is an administrative API available to user that should require higher privilege, we should consider moving it to separate port.

ahrtr · 2023-03-30T06:38:17Z

server/embed/etcd.go

+	addr = u.Host
+	if u.Scheme == "unix" || u.Scheme == "unixs" {
+		addr = u.Host + u.Path
+	}
+	secure = u.Scheme == "https" || u.Scheme == "unixs"
+	network = "tcp"
+	if u.Scheme == "unix" || u.Scheme == "unixs" {
+		network = "unix"
+	}


Suggested change

addr = u.Host

if u.Scheme == "unix" || u.Scheme == "unixs" {

addr = u.Host + u.Path

}

secure = u.Scheme == "https" || u.Scheme == "unixs"

network = "tcp"

if u.Scheme == "unix" || u.Scheme == "unixs" {

network = "unix"

}

addr = u.Host

network = "tcp"

if u.Scheme == "unix" || u.Scheme == "unixs" {

addr = u.Host + u.Path

network = "unix"

}

secure = u.Scheme == "https" || u.Scheme == "unixs"

ahrtr

LGTM with a minor comment.

cc @ptabor @chaochn47 @fuweid to double check.

chaochn47 · 2023-03-30T07:08:28Z

server/etcdmain/config.go

+		"List of URLs to listen on for client grpc traffic. Http services are available as long --listen-client-http-urls is not specified.",
+	)
+	fs.Var(
+		flags.NewUniqueURLsWithExceptions("", ""), "listen-client-http-urls",


IMHO, there is a nuance that advertise-client-urls to include listen-client-http-urls after the split to allow communicating via http though just in case users rely on this behavior.

I think adding some warning message in the help string of the flag is enough for now.

Signed-off-by: Marek Siarkowicz <[email protected]>

…er separate from http server Difference in load configuration for watch delay tests show how huge the impact is. Even with random write scheduler grpc under http server can only handle 500 KB with 2 seconds delay. On the other hand, separate grpc server easily hits 10, 100 or even 1000 MB within 100 miliseconds. Priority write scheduler that was used in most previous releases is far worse than random one. Tests configured to only 5 MB to avoid flakes and taking too long to fill etcd. Signed-off-by: Marek Siarkowicz <[email protected]>

Signed-off-by: Marek Siarkowicz <[email protected]>

ptabor

LGTM. Thank you.

fuweid

Thanks for the patch!

Left one comment for the defer handle, IIUC.

fuweid · 2023-03-30T10:45:16Z

server/embed/etcd.go

-		defer func(u url.URL) {
-			if err == nil {
+		defer func(addr string) {
+			if err == nil || sctx.l == nil {


I think we should pass sctx in the defer function instead of address.

https://go.dev/play/p/ZzmQADcBkJl

Nice find!, will send a separate PR with a fix.

serathius marked this pull request as draft March 10, 2023 16:41

fuweid reviewed Mar 11, 2023

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fuweid mentioned this pull request Mar 11, 2023

Etcd watch stream starvation under high read response load when sharing same connection and TLS is enabled #15402

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serathius changed the title ~~Separate grpc server~~ Allow user to separate http and grpc server Mar 13, 2023

serathius added release/v3.5 release/v3.4 labels Mar 13, 2023

serathius force-pushed the separate-grpc-server branch 8 times, most recently from 15f13fb to dde34f2 Compare March 16, 2023 16:43

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serathius mentioned this pull request Mar 17, 2023

Flaking TestConnectionMultiplexing #15495

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ahrtr mentioned this pull request Mar 18, 2023

Replace Cmux #15510

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serathius force-pushed the separate-grpc-server branch 2 times, most recently from 258ceab to 39b2dfc Compare March 28, 2023 11:52

chaochn47 reviewed Mar 28, 2023

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serathius force-pushed the separate-grpc-server branch from 39b2dfc to fb7d0d3 Compare March 29, 2023 09:35

ahrtr reviewed Mar 30, 2023

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serathius added 5 commits March 30, 2023 09:48

server: Separate client listener grouping from serving

85c48c4

Signed-off-by: Marek Siarkowicz <[email protected]>

server: Extract resolveUrl helper function

d1f674d

Signed-off-by: Marek Siarkowicz <[email protected]>

server: Pick one address that all grpc gateways connect to

419a56e

Signed-off-by: Marek Siarkowicz <[email protected]>

tests: Test separate http port connection multiplexing

65add8c

Signed-off-by: Marek Siarkowicz <[email protected]>

serathius force-pushed the separate-grpc-server branch from fb7d0d3 to 65add8c Compare March 30, 2023 07:50

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serathius merged commit 0bd0b6b into etcd-io:main Mar 30, 2023

serathius mentioned this pull request Mar 30, 2023

Plans for v3.5.8 release #15585

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fuweid mentioned this pull request Mar 30, 2023

server/embed: pass *sctx into defer instead captured var #15587

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This was referenced Mar 30, 2023

Separate grpc server 3.5 #15589

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[3.4] Separate grpc server #15620

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serathius mentioned this pull request Apr 7, 2023

Nominating @chaochn47 @jmhbnz @fuweid as members #15665

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serathius deleted the separate-grpc-server branch June 15, 2023 20:42

fuweid mentioned this pull request Jul 7, 2023

[3.4] embed: fix nil pointer dereference when stopServer #16195

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Nominating @fuweid as etcd reviewer #16650

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ugur99 mentioned this pull request Feb 28, 2024

Missing ListenClientHttpUrls flag documentation etcd-io/website#777

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Update doc of listen-client-urls and listen-client-http-urls etcd-io/website#865

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Update doc of listen-client-urls and listen-client-http-urls etcd-io/website#866

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		// net.Listener will rewrite ipv4 0.0.0.0 to ipv6 [::], breaking
		// hosts that disable ipv6. So, use the address given by the user.

Allow user to separate http and grpc server #15446

Allow user to separate http and grpc server #15446

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