IntrospectionQuery is causing huge memory consumption after the latest updates

[flymedllva]

Component(s)

router

Component version

0119c2d656674c07dde45372298a7b6ab625e70f

wgc version

0.58.5

controlplane version

-

router version

0119c2d656674c07dde45372298a7b6ab625e70f

What happened?

Description

After one of the recent Cosmo updates, there is an abnormal increase in memory consumption when calling IntrospectionQuery (e.g. in the Playground refresh button).

Our schema (config.json), from which we get this result, weighs 13.7M. On older versions of cosmo we didn't have this problem.

Occurs after executing err = t.loader.LoadGraphQLResponseData(ctx, response, t.resolvable) in resolve.go (wundergraph/graphql-go-tools/v2@v2.0.0-rc.63)

Steps to Reproduce

• Prepare a huge scheme
• Prepare a config from that schematic
• Run the cosmo with this config
• Press the refresh button in Playground

Expected Result

Consume the normal amount of memory for this request)

Actual Result

Brutal memory consumption)

https://github.com/user-attachments/assets/4793a6be-76a3-4647-91e3-667967081b5d

Environment information

Environment

OS: (e.g., "Ubuntu 20.04") macOS / Linux Package Manager: npm Compiler(if manually compiled): go version go1.22.3 darwin/arm64

Router configuration

version: "1"

# General router options
graph:
  name: "production"
  token: ""

log_level: "info"
listen_addr: "localhost:3002"
playground_enabled: true
introspection_enabled: true
json_log: true
shutdown_delay: 15s
grace_period: 20s
poll_interval: 10s
health_check_path: "/health"
readiness_check_path: "/health/ready"
liveness_check_path: "/health/live"
router_config_path: "config.json"

cors:
  allow_origins: ["*"]
  allow_methods:
    - HEAD
    - GET
    - POST
  allow_headers:
    - Origin
    - Content-Length
    - Content-Type
  allow_credentials: true
  max_age_minutes: 5m

# Config for custom modules   
# See "https://cosmo-docs.wundergraph.com/router/custom-modules" for more information   
modules:
  myModule:
    # Arbitrary values, unmarshalled by the module
    value: 1

Router execution config

No response

Log output

No response

Additional context

No response

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[jensneuse]

Does the same behavior happen when you make a introspection query from e.g. curl while disabling brotli? We've got a suspicion that the brotli Middleware is responsible, which gets usually activated by browsers.

[flymedllva]

OK, 50MB – router@0.95.1 Memory running out, 10GB+ – router@0.95.2

Video of work using router@0.95.2 https://github.com/user-attachments/assets/ab57f1c7-f7ea-4a73-b801-e0cc927ec53e

I haven't figured out how to disable brotli on this version, hint? I couldn't find it in the doc. I can cut it in the code if you tell me where)

[flymedllva]

Could it be?

https://github.com/wundergraph/graphql-go-tools/pull/845/files

[flymedllva]

8d7f20a7f43c29a1a0e80510afb6e7c318fcd080 in cosmo increased memory consumption in this scenario

[flymedllva]

Just in case. That PR https://github.com/wundergraph/cosmo/pull/968 didn't solve the problem

Since it seems to be consuming memory in graphql-go-tools/v2

[StarpTech]

Hi @flymedllva please retry the latest release. We did couple of optimizations. We will take a deeper look if it is still reproducible. Thank you.

[flymedllva]

Hi @StarpTech, I tried router@0.99.1, the result is the same

Please note my recent posts

https://github.com/user-attachments/assets/26cd1c75-6b7c-4d78-ba00-88937fdd8665

[StarpTech]

Hi, thanks for the test. Could you attach your router config here or send me via dustin@wundergraph.com? Thank you!

[YassineElbouchaibi]

Same on my side, 4gb has always be enough memory but since a few releases introspection has been failing and pods restarting: The spikes timestamps match with introspection queries.

[StarpTech]

@flymedllva please send me your router config. https://cosmo-docs.wundergraph.com/cli/router/fetch

[flymedllva]

Hi @StarpTech, sent it to your email dustin@wundergraph.com

[flymedllva]

@jensneuse @StarpTech

I tried https://github.com/wundergraph/cosmo/pull/986, no introspection problems on it, thanks!