Parameterize the load balancer stack #2142

olix0r · 2023-01-09T16:56:41Z

The load balancer/discovery modules in the concrete stacks use
hardcoded ewma parameters.

In preparation for making these parameters discoverable via the
API, this change modifies the balancer to accept this configuration
as a target param.

Furthermore, this change cleans up the balancer API to simplify the
way that we convert Resolve resolutions to Discover streams for
the balancer: the discovery buffer is spawned immediately instead
of using a MakeService. In practice, we flatten the 'make' future
into the discovery stream in the readycache, anyway; so there's no
functional difference.

Proxies may buffer TCP connections while waiting for policy discovery and may buffer HTTP requests while waiting for a shared resource (like a load balancer). Previously, a single configuration was used to configure both TCP and HTTP buffers. This change decouples these configurations in preparation for allowing balancer configuration to be configured by the control plane. Furthermore, this change updates the stack builder to always construct buffers with failfast and spawnready to (1) ensure that all buffers enforce the proper backpressure and load shedding semantics and (2) to reduce boilerplate. This change updates the proxy's environment configuration as follows: * Removed `LINKERD2_PROXY_INBOUND_DISPATCH_TIMEOUT` * Removed `LINKERD2_PROXY_OUTBOUND_DISPATCH_TIMEOUT` * Added `LINKERD2_PROXY_INBOUND_DISCOVERY_IDLE_TIMEOUT` * Added `LINKERD2_PROXY_OUTBOUND_DISCOVERY_IDLE_TIMEOUT` * Removed `LINKERD2_PROXY_BUFFER_CAPACITY` * Removed `LINKERD2_PROXY_INBOUND_ROUTER_MAX_IDLE_AGE` * Removed `LINKERD2_PROXY_OUTBOUND_ROUTER_MAX_IDLE_AGE` * Added `LINKERD2_PROXY_INBOUND_HTTP_BUFFER_CAPACITY` * Added `LINKERD2_PROXY_INBOUND_HTTP_FAILFAST_TIMEOUT` * Added `LINKERD2_PROXY_OUTBOUND_TCP_BUFFER_CAPACITY` * Added `LINKERD2_PROXY_OUTBOUND_TCP_FAILFAST_TIMEOUT` * Added `LINKERD2_PROXY_OUTBOUND_HTTP_BUFFER_CAPACITY` * Added `LINKERD2_PROXY_OUTBOUND_HTTP_FAILFAST_TIMEOUT` * Added `LINKERD2_PROXY_OUTBOUND_HTTP1_CONNECTION_POOL_IDLE_TIMEOUT`

The `FailFast` middleware limits the period of time an inner `Service` may return `Poll::Pending` from its `poll_ready` method without becoming ready. If inner service does not become ready by the end of the failfast timeout, the `FailFast` middleware becomes ready and immediately accepts but fails all requests until the inner service once again becomes ready. This allows `Buffer` around an inner service to be drained when the buffered service has become unavailable. However, an unfortunate consequence of the current `FailFast` design is that it advertises readiness up the stack _past_ a `Buffer` that wraps it. Once the service has entered the failfast state, it will return `Poll::Ready(Ok(()))` for all `poll_ready` calls until the inner service exits failfast. Since a `Buffer` will accept new requests as long as it has queue capacity, without polling the inner service (it is instead polled by the buffer's background worker task), the buffer will continue accepting new requests and immediately failing them as long as the service inside it is in a failfast state. This is not desirable, as it means that a higher level traffic distributor or load balancer will see a `Buffer<FailFast<S>>` as being ready to recieve new requests even when the `S` service is not ready and the `FailFast` middleware will simply fail those requests. It would be preferable for the `Buffer<FailFast<S>>` to return `Poll::Pending` from `poll_ready` when in the failfast state, so that *new* requests are not dispatched to it, but still proactively drain requests already dispatched into the buffer. This branch changes the `FailFast` implementation to consist a _pair_ of middleware, `FailFast` and `Advertise`. The `FailFast` middleware behaves similarly to how it did previously, but is modified so that the inner service's readiness state is shared with the `Advertise` middleware. The `Advertise` service will advertise the inner service's _actual_ readiness in `poll_ready` (e.g. return `Poll::Pending` while in failfast), while the `FailFast` service will return `Poll::Ready(Ok(()))` and failfast all requests it recieves. This way, a `Buffer` (or other middleware) can be placed in between an inner `FailFast` service and an outer `Advertise` service. The `Buffer`'s worker task will see the `Poll::Ready(Ok(()))` returned by the `FailFast` middleware, and drain its queue, while an outer traffic distributor or load balancer will see the `Poll::Pending` returned by `Advertise` (reflecting the actual readiness of the inner service), and dispatch traffic elsewhere. In order to implement this, it was necessary to change the `FailFast` middleware to drive the innermost service to readiness on a background task when it is in the `FailFast` state. This is because a `Buffer`'s worker only polls the inner service's readiness when it has requests to dispatch, rather than in the `Buffer` service's `poll_ready`. Therefore, it's necessary to ensure we proactively drive the readiness of the inner service while in the failfast state, as the `FailFast` service itself will not be polled again once the buffer's queue has drained. Currently, `Buffer`s are always paired with a `tower::spawn_ready::SpawnReady` middleware, which does something analogous, but unconditionally on _all_ `Pending` calls to `poll_ready`. The new implementation has the side benefit of obviating the need for a separate `SpawnReady` middleware, and is a bit more efficient about spawning tasks, since a new task is only spawned when *in the failfast state*, rather than any time the inner service returns `Poll::Pending`. Depends on #2078

Co-authored-by: Oliver Gould <[email protected]>

hawkw

overall, this makes sense! commented on some minor things.

linkerd/proxy/tcp/src/balance.rs

linkerd/proxy/resolve/src/recover.rs

linkerd/proxy/resolve/src/map_endpoint.rs

linkerd/proxy/http/src/balance.rs

linkerd/app/outbound/src/http/concrete.rs

linkerd/app/core/src/control.rs

linkerd/proxy/tcp/src/balance.rs

hawkw

looks great! i left comments on a handful of minor nits, but no blockers!

hawkw · 2023-01-10T21:46:54Z

linkerd/proxy/balance/Cargo.toml

+linkerd-proxy-core = { path = "../../proxy/core" }
+linkerd-stack = { path = "../../stack" }
+pin-project = "1"
+rand = "0.8"


do we need all of rand's default features?

this is what we're using elsewhere at the moment. limiting it doesn't seem to help us (so a dep must pull in the defaults).

hawkw · 2023-01-10T21:53:04Z

linkerd/proxy/balance/src/lib.rs

+/// Configures a stack to resolve targets to balance requests over `N`-typed
+/// endpoint stacks.
+#[derive(Debug)]
+pub struct NewBalancePeakEwma<C, Req, R, N> {


naming nit (silly): NewPeakEwmaBalance feels slightly more grammatically correct to me, since we would say that this is making new "peak EWMA balancers", rather than new "balancers peak EWMA"...

i think of it more as 'balance (with) peak ewma'

hawkw · 2023-01-10T21:53:26Z

linkerd/proxy/balance/src/lib.rs

+
+/// Configures a stack to resolve targets to balance requests over `N`-typed
+/// endpoint stacks.
+#[derive(Debug)]


this will require the C and Req types to be Debug. not sure if we care in practice.

hawkw · 2023-01-10T21:54:33Z

linkerd/proxy/balance/src/lib.rs

+pub type Balance<C, Req, S> = p2c::Balance<Buffer<C, S>, Req>;
+
+/// Wraps the inner stack in [`NewPeakEwma`] to produce [`PeakEwma`] services.
+#[derive(Debug)]


this will also require that C and Req be Debug, not sure if we care.

hawkw · 2023-01-10T21:56:28Z

linkerd/proxy/balance/src/lib.rs

+        // Converts durations to nanos in f64.
+        //
+        // Due to a lossy transformation, the maximum value that can be
+        // represented is ~585 years, which, I hope, is more than enough to


i also hope this

hawkw · 2023-01-10T22:07:29Z

linkerd/proxy/http/src/balance.rs

+pub type Body<B> = PendingUntilFirstDataBody<balance::Handle, B>;

-// === impl Layer ===
+pub type EwmaConfig = balance::EwmaConfig;


what's up with the type alias? is there a plan for these types to differ based on protocol?

eh, it's basically just a pub use for the moment so callers don't need to know about the balance crate explicitly.

This release includes many internal changes to prepare for the new client policy API. Stack metric label values have changed to reflect the new shape of the outbound proxy. --- * build(deps): bump try-lock from 0.2.3 to 0.2.4 (linkerd/linkerd2-proxy#2139) * build(deps): bump regex from 1.7.0 to 1.7.1 (linkerd/linkerd2-proxy#2145) * build(deps): bump tokio from 1.24.0 to 1.24.1 (linkerd/linkerd2-proxy#2144) * Parameterize the load balancer stack (linkerd/linkerd2-proxy#2142) * build(deps): bump prost-types from 0.11.5 to 0.11.6 (linkerd/linkerd2-proxy#2147) * build(deps): bump prost from 0.11.5 to 0.11.6 (linkerd/linkerd2-proxy#2148) * build(deps): bump prost-build from 0.11.5 to 0.11.6 (linkerd/linkerd2-proxy#2149) * stack: add `AnnotateError` middleware (linkerd/linkerd2-proxy#2158) * Fix proxy-core dependencies (linkerd/linkerd2-proxy#2163) * build(deps): bump tj-actions/changed-files from 35.3.1 to 35.4.1 (linkerd/linkerd2-proxy#2153) * orig_proto: don't set `connection: close` on errors (linkerd/linkerd2-proxy#2171) * build(deps): bump bumpalo from 3.11.1 to 3.12.0 (linkerd/linkerd2-proxy#2166) * build(deps): bump proc-macro2 from 1.0.49 to 1.0.50 (linkerd/linkerd2-proxy#2165) * build(deps): bump tj-actions/changed-files from 35.4.1 to 35.4.4 (linkerd/linkerd2-proxy#2172) * build(deps): bump windows_x86_64_msvc from 0.42.0 to 0.42.1 (linkerd/linkerd2-proxy#2164) * configure buffers from target `Param`s (linkerd/linkerd2-proxy#2173) * Simplify profile discovery (linkerd/linkerd2-proxy#2170) * stack: Unify AnnotateError and MapErr (linkerd/linkerd2-proxy#2180) * build(deps): bump windows_aarch64_msvc from 0.42.0 to 0.42.1 (linkerd/linkerd2-proxy#2176) * build(deps): bump async-trait from 0.1.61 to 0.1.63 (linkerd/linkerd2-proxy#2177) * build(deps): bump tokio from 1.24.1 to 1.24.2 (linkerd/linkerd2-proxy#2178) * Add the `meshtls-boring-fips` feature flag (linkerd/linkerd2-proxy#2168) * Update HTTP error responder to log version info (linkerd/linkerd2-proxy#2182) * build(deps): bump which from 4.3.0 to 4.4.0 (linkerd/linkerd2-proxy#2185) * build(deps): bump derive_arbitrary from 1.2.2 to 1.2.3 (linkerd/linkerd2-proxy#2184) * build(deps): bump unicode-bidi from 0.3.8 to 0.3.10 (linkerd/linkerd2-proxy#2183) * build(deps): bump linkerd/dev from 38 to 39 (linkerd/linkerd2-proxy#2175) * add target metadata to error contexts (linkerd/linkerd2-proxy#2162) * build(deps): bump rustls from 0.20.7 to 0.20.8 (linkerd/linkerd2-proxy#2187) * build(deps): bump ahash from 0.8.2 to 0.8.3 (linkerd/linkerd2-proxy#2188) * build(deps): bump matches from 0.1.9 to 0.1.10 (linkerd/linkerd2-proxy#2189) * Rename MakeThunk to NewThunk (linkerd/linkerd2-proxy#2197) * Add `NewQueueWithoutTimeout` (linkerd/linkerd2-proxy#2196) * Cache discovery results independently of proxy stacks (linkerd/linkerd2-proxy#2195) * core: Rename Stack utilities for clarity (linkerd/linkerd2-proxy#2199) * gateway: Unify discovery for HTTP & opaque stacks (linkerd/linkerd2-proxy#2198) * build(deps): bump libfuzzer-sys from 0.4.5 to 0.4.6 (linkerd/linkerd2-proxy#2193) * build(deps): bump arbitrary from 1.2.2 to 1.2.3 (linkerd/linkerd2-proxy#2191) * http: Remove `Clone` requirement in servers (linkerd/linkerd2-proxy#2200) * build(deps): bump either from 1.8.0 to 1.8.1 (linkerd/linkerd2-proxy#2192) * build(deps): bump bytes from 1.3.0 to 1.4.0 (linkerd/linkerd2-proxy#2202) * build(deps): bump cc from 1.0.78 to 1.0.79 (linkerd/linkerd2-proxy#2203) * build(deps): bump tj-actions/changed-files from 35.4.4 to 35.5.1 (linkerd/linkerd2-proxy#2211) * build(deps): bump tokio from 1.24.2 to 1.25.0 (linkerd/linkerd2-proxy#2206) * build(deps): bump miniz_oxide from 0.6.2 to 0.6.4 (linkerd/linkerd2-proxy#2207) * build(deps): bump async-trait from 0.1.63 to 0.1.64 (linkerd/linkerd2-proxy#2205) * Split outbound test modules into files (linkerd/linkerd2-proxy#2213) * Disable broken tests (linkerd/linkerd2-proxy#2214) * Add traceparent header parsing for w3c tracecontext (linkerd/linkerd2-proxy#2179) * Simplify the `Resolve` trait alias (linkerd/linkerd2-proxy#2218) * downgrade `miniz_oxide` from yanked 0.6.4 to 0.6.2 (linkerd/linkerd2-proxy#2219) * build(deps): bump heck from 0.4.0 to 0.4.1 (linkerd/linkerd2-proxy#2215) * ci: Fix check-each workflow (linkerd/linkerd2-proxy#2222) * Use a cascading stack with protocol detection (linkerd/linkerd2-proxy#2221) * ci: Fix quotation in list-crates (linkerd/linkerd2-proxy#2225) * outbound: Split out separate 'opaq' modules (linkerd/linkerd2-proxy#2224) * Update `linkerd2-proxy-api` to v0.8.0 (linkerd/linkerd2-proxy#2223) * outbound: Lint stack target types (linkerd/linkerd2-proxy#2226) * outbound: Split sidecar and ingress stack modules (linkerd/linkerd2-proxy#2227) * gateway: Split 'http' and 'opaq' modules (linkerd/linkerd2-proxy#2230) * test: Disable tap::rejects_incorrect_identity_when_identity_is_expected (linkerd/linkerd2-proxy#2231) * outbound: Improve discovery cache test (linkerd/linkerd2-proxy#2233) * integration: add destination update builders (linkerd/linkerd2-proxy#2232) * Rename linkerd-server-policy to linkerd-proxy-server-policy (linkerd/linkerd2-proxy#2235) * integration: add test for direct HTTP connections (linkerd/linkerd2-proxy#2234) * outbound: Refactor stack target types (linkerd/linkerd2-proxy#2210) * Add client-policy types (linkerd/linkerd2-proxy#2236) Signed-off-by: Oliver Gould <[email protected]>

This release includes many internal changes to prepare for the new client policy API. Stack metric label values have changed to reflect the new shape of the outbound proxy. This change also includes some test improvements that helped debug an issue while merging this. --- * build(deps): bump try-lock from 0.2.3 to 0.2.4 (linkerd/linkerd2-proxy#2139) * build(deps): bump regex from 1.7.0 to 1.7.1 (linkerd/linkerd2-proxy#2145) * build(deps): bump tokio from 1.24.0 to 1.24.1 (linkerd/linkerd2-proxy#2144) * Parameterize the load balancer stack (linkerd/linkerd2-proxy#2142) * build(deps): bump prost-types from 0.11.5 to 0.11.6 (linkerd/linkerd2-proxy#2147) * build(deps): bump prost from 0.11.5 to 0.11.6 (linkerd/linkerd2-proxy#2148) * build(deps): bump prost-build from 0.11.5 to 0.11.6 (linkerd/linkerd2-proxy#2149) * stack: add `AnnotateError` middleware (linkerd/linkerd2-proxy#2158) * Fix proxy-core dependencies (linkerd/linkerd2-proxy#2163) * build(deps): bump tj-actions/changed-files from 35.3.1 to 35.4.1 (linkerd/linkerd2-proxy#2153) * orig_proto: don't set `connection: close` on errors (linkerd/linkerd2-proxy#2171) * build(deps): bump bumpalo from 3.11.1 to 3.12.0 (linkerd/linkerd2-proxy#2166) * build(deps): bump proc-macro2 from 1.0.49 to 1.0.50 (linkerd/linkerd2-proxy#2165) * build(deps): bump tj-actions/changed-files from 35.4.1 to 35.4.4 (linkerd/linkerd2-proxy#2172) * build(deps): bump windows_x86_64_msvc from 0.42.0 to 0.42.1 (linkerd/linkerd2-proxy#2164) * configure buffers from target `Param`s (linkerd/linkerd2-proxy#2173) * Simplify profile discovery (linkerd/linkerd2-proxy#2170) * stack: Unify AnnotateError and MapErr (linkerd/linkerd2-proxy#2180) * build(deps): bump windows_aarch64_msvc from 0.42.0 to 0.42.1 (linkerd/linkerd2-proxy#2176) * build(deps): bump async-trait from 0.1.61 to 0.1.63 (linkerd/linkerd2-proxy#2177) * build(deps): bump tokio from 1.24.1 to 1.24.2 (linkerd/linkerd2-proxy#2178) * Add the `meshtls-boring-fips` feature flag (linkerd/linkerd2-proxy#2168) * Update HTTP error responder to log version info (linkerd/linkerd2-proxy#2182) * build(deps): bump which from 4.3.0 to 4.4.0 (linkerd/linkerd2-proxy#2185) * build(deps): bump derive_arbitrary from 1.2.2 to 1.2.3 (linkerd/linkerd2-proxy#2184) * build(deps): bump unicode-bidi from 0.3.8 to 0.3.10 (linkerd/linkerd2-proxy#2183) * build(deps): bump linkerd/dev from 38 to 39 (linkerd/linkerd2-proxy#2175) * add target metadata to error contexts (linkerd/linkerd2-proxy#2162) * build(deps): bump rustls from 0.20.7 to 0.20.8 (linkerd/linkerd2-proxy#2187) * build(deps): bump ahash from 0.8.2 to 0.8.3 (linkerd/linkerd2-proxy#2188) * build(deps): bump matches from 0.1.9 to 0.1.10 (linkerd/linkerd2-proxy#2189) * Rename MakeThunk to NewThunk (linkerd/linkerd2-proxy#2197) * Add `NewQueueWithoutTimeout` (linkerd/linkerd2-proxy#2196) * Cache discovery results independently of proxy stacks (linkerd/linkerd2-proxy#2195) * core: Rename Stack utilities for clarity (linkerd/linkerd2-proxy#2199) * gateway: Unify discovery for HTTP & opaque stacks (linkerd/linkerd2-proxy#2198) * build(deps): bump libfuzzer-sys from 0.4.5 to 0.4.6 (linkerd/linkerd2-proxy#2193) * build(deps): bump arbitrary from 1.2.2 to 1.2.3 (linkerd/linkerd2-proxy#2191) * http: Remove `Clone` requirement in servers (linkerd/linkerd2-proxy#2200) * build(deps): bump either from 1.8.0 to 1.8.1 (linkerd/linkerd2-proxy#2192) * build(deps): bump bytes from 1.3.0 to 1.4.0 (linkerd/linkerd2-proxy#2202) * build(deps): bump cc from 1.0.78 to 1.0.79 (linkerd/linkerd2-proxy#2203) * build(deps): bump tj-actions/changed-files from 35.4.4 to 35.5.1 (linkerd/linkerd2-proxy#2211) * build(deps): bump tokio from 1.24.2 to 1.25.0 (linkerd/linkerd2-proxy#2206) * build(deps): bump miniz_oxide from 0.6.2 to 0.6.4 (linkerd/linkerd2-proxy#2207) * build(deps): bump async-trait from 0.1.63 to 0.1.64 (linkerd/linkerd2-proxy#2205) * Split outbound test modules into files (linkerd/linkerd2-proxy#2213) * Disable broken tests (linkerd/linkerd2-proxy#2214) * Add traceparent header parsing for w3c tracecontext (linkerd/linkerd2-proxy#2179) * Simplify the `Resolve` trait alias (linkerd/linkerd2-proxy#2218) * downgrade `miniz_oxide` from yanked 0.6.4 to 0.6.2 (linkerd/linkerd2-proxy#2219) * build(deps): bump heck from 0.4.0 to 0.4.1 (linkerd/linkerd2-proxy#2215) * ci: Fix check-each workflow (linkerd/linkerd2-proxy#2222) * Use a cascading stack with protocol detection (linkerd/linkerd2-proxy#2221) * ci: Fix quotation in list-crates (linkerd/linkerd2-proxy#2225) * outbound: Split out separate 'opaq' modules (linkerd/linkerd2-proxy#2224) * Update `linkerd2-proxy-api` to v0.8.0 (linkerd/linkerd2-proxy#2223) * outbound: Lint stack target types (linkerd/linkerd2-proxy#2226) * outbound: Split sidecar and ingress stack modules (linkerd/linkerd2-proxy#2227) * gateway: Split 'http' and 'opaq' modules (linkerd/linkerd2-proxy#2230) * test: Disable tap::rejects_incorrect_identity_when_identity_is_expected (linkerd/linkerd2-proxy#2231) * outbound: Improve discovery cache test (linkerd/linkerd2-proxy#2233) * integration: add destination update builders (linkerd/linkerd2-proxy#2232) * Rename linkerd-server-policy to linkerd-proxy-server-policy (linkerd/linkerd2-proxy#2235) * integration: add test for direct HTTP connections (linkerd/linkerd2-proxy#2234) * outbound: Refactor stack target types (linkerd/linkerd2-proxy#2210) * Add client-policy types (linkerd/linkerd2-proxy#2236)

olix0r and others added 30 commits December 16, 2022 03:40

wip: buffers

8d0d573

make each buffer configurable

c1bc339

split concrete into a separate stack

9fe1f22

concrete cache

f972b2b

-checks

1ad89e1

per-route distributor

018331b

Move buffer & stack metrics into concrete stack

f2f7e0e

wip

6f18cb3

wip

b734788

simplify distributor

9f01cde

wip

3615bd1

Move dynamic routers into outbound

0465195

Merge branch 'main' into ver/buffmas

b1972b7

Use BufferConfig directly

cbc7758

Restore concurrency limit

a211d3e

Merge branch 'main' into ver/buffmas

c7922a4

touchup route stuff; buffer configs

6a93036

restore endpoint trace contexts

9ebb0a8

TODOs

9afd8fb

typo

9e8e0bf

fixup stack + tests

ab86158

Merge branch 'main' into ver/concretemas

a72313f

Merge branch 'ver/buffmas' into ver/concretemas

35314a1

Update linkerd/stack/src/failfast.rs

dea82cc

Co-authored-by: Oliver Gould <[email protected]>

Update linkerd/stack/src/failfast.rs

2928409

Co-authored-by: Oliver Gould <[email protected]>

empty -> invalid

3af02bf

360 noscope

6eaa093

lol apparently there's a test that expects scope

259bda1

fixup tcp

c5fa370

olix0r self-assigned this Jan 9, 2023

hawkw reviewed Jan 9, 2023

View reviewed changes

Base automatically changed from ver/concretemas to main January 9, 2023 18:02

olix0r added 10 commits January 9, 2023 18:17

Merge branch 'main' into ver/nubal

53a9e99

Merge branch 'main' into ver/nubal

7401130

Make the balancer generic

21cd3be

fixup

88e2d77

replace MapEndpoint helper

a621ade

cleanup control::balance

4595270

naming

d2352ba

checkless

98bc41b

fixup

5e97c6c

touchup

7d6c19f

olix0r marked this pull request as ready for review January 10, 2023 02:23

olix0r requested a review from a team as a code owner January 10, 2023 02:23

olix0r added 7 commits January 10, 2023 02:24

lessen diff

e8fc698

naming

d2cbc82

move discover into balance

beb71ea

comments

313956f

simplify discover module -- no need for NewService

6dfb1a2

naming

c42282b

comments/logs

4676518

hawkw approved these changes Jan 10, 2023

View reviewed changes

olix0r merged commit 6d2abbc into main Jan 10, 2023

olix0r deleted the ver/nubal branch January 10, 2023 22:47

olix0r mentioned this pull request Feb 16, 2023

proxy: v2.190.1 linkerd/linkerd2#10342

Merged

jeremychase added this to the stable-2.13.0 milestone Mar 8, 2023

Parameterize the load balancer stack #2142

Parameterize the load balancer stack #2142

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olix0r commented Jan 9, 2023 •

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