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docs: Redis cluster connection schemes #3534

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BrynCooke opened this issue Aug 3, 2023 · 0 comments · Fixed by #3556
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docs: Redis cluster connection schemes #3534

BrynCooke opened this issue Aug 3, 2023 · 0 comments · Fixed by #3556
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documentation Improvements or additions to documentation

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@BrynCooke
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BrynCooke commented Aug 3, 2023 •
edited by abernix
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✍️ This is just a request to document.

We currently use the fred redis client in the router.
It seems that redis has no automatic negotiation of connections when connecting to a single node or a cluster, and drivers usually need to be configured explicitly.

The fred library does this using URL scheme:

  /// * `redis` - TCP connected to a centralized server.
  /// * `rediss` - TLS connected to a centralized server.
  /// * `redis-cluster` - TCP connected to a cluster.
  /// * `rediss-cluster` - TLS connected to a cluster.
  /// * `redis-sentinel` - TCP connected to a centralized server behind a sentinel layer.
  /// * `rediss-sentinel` - TLS connected to a centralized server behind a sentinel layer.

https://github.com/aembke/fred.rs/blob/main/src/types/config.rs#L524-L582
@BrynCooke BrynCooke assigned BrynCooke and unassigned BrynCooke Aug 3, 2023
@BrynCooke BrynCooke changed the title APQ Redis always resulting in a cache miss when range movement has occured Configuration for redis cluster connections needs to documented and possibly wrapped Aug 4, 2023
@BrynCooke BrynCooke changed the title Configuration for redis cluster connections needs to documented and possibly wrapped Configuration for redis cluster connections needs to documented Aug 4, 2023
@abernix abernix added the documentation Improvements or additions to documentation label Aug 7, 2023
@abernix abernix changed the title Configuration for redis cluster connections needs to documented docs: Configuration for redis cluster connection schemes Aug 7, 2023
@abernix abernix changed the title docs: Configuration for redis cluster connection schemes docs: Redis cluster connection schemes Aug 7, 2023
@Geal Geal mentioned this issue Aug 9, 2023
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Geal added a commit that referenced this issue Aug 11, 2023
@Geal
document the Redis URL format (#3556)
e18f6f8 
Fix #3534
This was referenced Aug 11, 2023
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o0Ignition0o added a commit that referenced this issue Aug 18, 2023
@o0Ignition0o @garypen
@BrynCooke @abernix @chandrikas
prep release: v1.27.0 (#3602)
3adfaa0 
> **Note**
>
> When approved, this PR will merge into **the `1.27.0` branch** which
will — upon being approved itself — merge into `main`.
>
> **Things to review in this PR**:
> - Changelog correctness (There is a preview below, but it is not
necessarily the most up to date. See the _Files Changed_ for the true
reality.)
>  - Version bumps
>  - That it targets the right release branch (`1.27.0` in this case!).
>
---
## 🚀 Features

### Add a metric tracking coprocessor latency ([Issue
#2924](#2924))

Introduces a new metric for the router:

```
apollo.router.operations.coprocessor.duration
```

It has one attribute:

```
coprocessor.stage: string (RouterRequest, RouterResponse, SubgraphRequest, SubgraphResponse)
```

It is a histogram metric tracking the time spent calling into the
coprocessor.

Note that the name of this metric may change in the future.

By [@Geal](https://github.com/Geal) in
#3513

### Configure AWS SigV4 authentication for subgraph requests ([PR
#3365](#3365))

Secure your router to subgraph communication on AWS using [Signature
Version
4](https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html)
(Sigv4)!
This changeset provides you with a way to set up hard-coded credentials,
as well as a default provider chain.
We recommend using the default provider chain configuration.

Full use example:

```yaml
    authentication:
      subgraph:
        all: # configuration that will apply to all subgraphs
          aws_sig_v4:
            default_chain:
              profile_name: "my-test-profile" # https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html#ec2-instance-profile
              region: "us-east-1" # https://docs.aws.amazon.com/general/latest/gr/rande.html
              service_name: "lambda" # https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html
              assume_role: # https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles.html
                role_arn: "test-arn"
                session_name: "test-session"
                external_id: "test-id"
        subgraphs:
          products:
            aws_sig_v4:
              hardcoded: # Not recommended, prefer using default_chain as shown above
                access_key_id: "my-access-key"
                secret_access_key: "my-secret-access-key"
                region: "us-east-1"
                service_name: "vpc-lattice-svcs" # "s3", "lambda" etc.
```

The full documentation can be found in the [router
documentation](https://www.apollographql.com/docs/router/configuration/authn-subgraph).

By [@o0Ignition0o](https://github.com/o0Ignition0o) and
[@BlenderDude](https://github.com/BlenderDude) in
#3365

### Helm: add init containers to deployment ([Issue
#3248](#3248))

This is a new option when deploying the router, so that containers may
be specified which execute before the Router container (or any extra
Containers) begin executing. You can read more about [init
containers](https://kubernetes.io/docs/concepts/workloads/pods/init-containers/)
in the Kubernetes documentation.

By [@laszlorostas](https://github.com/laszlorostas) in
#3444

### Helm: expose the `lifecycle` object on the router container ([Issue
#3563](#3563))

You can now set the [Kubernetes `lifecycle`
object](https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/)
on the router container in the helm chart.

By [@bjoernw](https://github.com/bjoernw) in
#3570

## 🐛 Fixes

### Require the main (GraphQL) route to shutdown before other routes
([Issue #3521](#3521))

Router shutdown sequence has been improved to ensure that the main
(GraphQL) route is shutdown before other routes are shutdown. Prior to
this change all routes shut down in parallel and this would mean that,
for example, health checks stopped responding prematurely.

This was particularly undesirable when the router is executing in
Kubernetes, since continuing to report live/ready checks during shutdown
is a requirement.

By [@garypen](https://github.com/garypen) in
#3557

### Spelling of `content_negociation` corrected to `content_negotiation`
([Issue #3204](#3204))

We had a bit of a French twist on one of our internal module names. We
won't promise it won't happen again, but `content_negociation` is
spelled as `content_negotiation` now. 😄

Thank you for this contribution!

By [@krishna15898](https://github.com/krishna15898) in
#3162

### Fix Redis reconnections ([Issue
#3045](#3045))

Redis reconnection policy was using an exponential backoff delay with a
maximum number of attempts. Once that maximum is reached, reconnection
was never tried again (there's no baseline retry). The router will now
always retry with a maximum delay of 2 seconds, and a timeout of 1
millisecond, so that the router can continue serving requests in the
meantime.

This commit contains additional fixes:
- Release the lock on the in-memory cache while waiting for Redis, to
let the in memory cache serve other requests.
- Add a custom serializer for the `SubSelectionKey` type. This type is
used as key in a `HashMap` which is converted to a JSON object. Since
object keys in JSON must be strings, a specific serializer was needed
instead of the derived one.

By [@Geal](https://github.com/Geal) in
#3509

### Close the subscription when a new supergraph becomes active ([Issue
#3320](#3320))

Router schema/supergraph updates weren't resetting existing
subscriptions which meant they could run with an out of date query plan.

With this change, the router will signal clients that a
`SUBSCRIPTION_SCHEMA_RELOAD` has occurred and close the running
subscription. Clients will then subscribe again:


```json
{
  "errors": [
    {
      "message": "subscription has been closed due to a schema reload",
      "extensions": {
        "code": "SUBSCRIPTION_SCHEMA_RELOAD"
      }
    }
  ]
}
```


By [@bnjjj](https://github.com/bnjjj) in
#3341

### Redis storage: return an error if a non serializable value is sent.
([#3594](#3594))

An error will now be logged when a value is unable to be serialized
before being sent to the Redis storage backend. The message suggests
opening an issue since this would be a router bug that we'd need to fix!

By [@o0Ignition0o](https://github.com/o0Ignition0o) in
#3597

### Handle ping/pong websocket messages before the Ack message is
received ([PR #3562](#3562))

Websocket servers will sometimes send Ping() messages before they Ack
the connection initialization. This changeset allows the router to send
Pong() messages, while still waiting until either
`CONNECTION_ACK_TIMEOUT` elapsed, or the server successfully Acked the
websocket connection start.

By [@o0Ignition0o](https://github.com/o0Ignition0o) in
#3562

### Subscription requests only count in telemetry if the feature is
actually enabled ([PR
#3500](#3500))

Count subscription requests only if the feature is enabled.

The router would previously count subscription requests regardless of
whether the feature was enabled or not. This fix changes the behavior to
only count subscription requests when the feature is enabled.

By [@bnjjj](https://github.com/bnjjj) in
#3500

## 🛠 Maintenance

### Update `datadog-subgraph/`'s npm dependencies ([PR
#3560](#3560))

This changeset updates the `dd-trace` dependency and the Node.js version
of the example Dockerfile.

By [@o0Ignition0o](https://github.com/o0Ignition0o) in
#3560

### Remove some `panic!` calls in persisted query logic ([PR
#3527](#3527))

Replace a few `panic!` calls with `expect()`s in the persisted query
code to improve clarity.

By [@BrynCooke](https://github.com/BrynCooke) in
#3527

### Add a warning if we think `istio-proxy` injection is causing
problems ([Issue
#3533](#3533))

We have encountered situations where the injection of `istio-proxy` in a
router pod (executing in Kubernetes) causes networking errors during
[Apollo
Uplink](https://www.apollographql.com/docs/federation/managed-federation/uplink/)
communication.

The situation isn't due to Apollo Uplink, but rather the router is
executing and attempting to retrieve Apollo Uplink data while the
`istio-proxy` is simultaneously modifying its network configuration.

This new warning message directs users to information which should help
them to configure their Kubernetes cluster or pod to avoid this problem.

By [@garypen](https://github.com/garypen) in
#3545

### Log when custom plugins are detected with potentially-silenced log
entries ([Issue
#3526](#3526))

Since [PR #3477](#3477),
users with custom plugins lost some log entries. This is because the
default logging filter now restricts log entries to those that are in
the `apollo` module, as originally intended.

Users that have custom plugins need to configure the logging filter to
include their modules, but may not have realised this.

Now, if a custom plugin is detected, a message will be logged to the
console indicating that the logging filter may need to be configured.

By [@BrynCooke](https://github.com/BrynCooke) in
#3540

### Parent based sampling tests ([PR
#3136](#3136))

This adds test for OpenTelemetry sampling defined either in the
configuration or in headers carried by the request

By [@Geal](https://github.com/Geal) in
#3136

## 📚 Documentation

### Redis URL format ([Issue
#3534](#3534))

The Redis client used in the Router follows a convention on Redis server
URLs to indicate TLS, cluster or sentinel usage


By [@Geal](https://github.com/Geal) in
#3556

### Request lifecycle ([PR
#3391](#3391))

This adds in-depth documentation of:
- the entire request lifecycle
- which services exist in the router
- the request and response types they use
- where plugins can attach themselves

By [@Geal](https://github.com/Geal)
[@Meschreiber](https://github.com/Meschreiber) in
#3391

### TLS termination and subgraph overrides ([Issue
#3100](#3100))

TLS termination was added in [PR
#2614](#2614) but never
documented. Subgraph certificate override was added in [PR
#2008](#2008) but the
documentation missed some details on self-signed certificates. These
have both been corrected!

By [@Geal](https://github.com/Geal) in
#3436

### `self` is immutable in the `Plugin` trait's methods ([Issue
#3539](#3539))

The documentation previously displayed `Plugin`'s methods as taking a
mutable reference to `self`, while they actually take an _immutable_
reference to it.

We've fixed the documentation.

By [@Geal](https://github.com/Geal) in
#3555

---------

Co-authored-by: Gary Pennington <[email protected]>
Co-authored-by: Bryn Cooke <[email protected]>
Co-authored-by: Jesse Rosenberger <[email protected]>
Co-authored-by: Chandrika Srinivasan <[email protected]>
@abernix abernix mentioned this issue Dec 1, 2023
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document the Redis URL format apollographql/router
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