Implement per-plan subgraph request deduplication by kamilkisiela · Pull Request #779 · graphql-hive/router

kamilkisiela · 2026-02-17T17:42:45Z

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gemini-code-assist · 2026-02-17T17:43:09Z

Summary of Changes

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This pull request significantly enhances the efficiency of GraphQL query execution by preventing redundant network calls to subgraphs. By introducing a per-plan deduplication layer, the system can now identify and reuse responses for identical subgraph requests, leading to reduced latency and improved resource utilization during complex query processing.

Highlights

Per-Plan Subgraph Request Deduplication: Implemented a caching mechanism within the query plan executor to deduplicate identical subgraph requests. If multiple nodes in a query plan require the same subgraph request (based on query, variables, headers, etc.), only the first request will be executed, and subsequent identical requests will reuse the cached response.
Stable Hashing for Subgraph Requests: Introduced a robust and stable hashing implementation for SubgraphExecutionRequest to accurately identify identical requests. This includes careful handling of maps (variables, extensions, headers) by sorting keys to ensure consistent hash values regardless of insertion order.
Concurrent Response Caching: Utilized DashMap and OnceCell to create a thread-safe, concurrent cache for subgraph responses. This allows multiple concurrent execution paths within a query plan to wait for and share the result of a single subgraph request.

Changelog

lib/executor/src/execution/plan.rs
- Added Hash, Hasher, Arc, DashMap, OnceCell, and Xxh3 imports for hashing and concurrent caching.
- Modified the Executor struct to include a response_cache for storing deduplicated subgraph responses.
- Updated the execute_plan_node method to implement the deduplication logic, checking the cache before executing subgraph requests.
- Introduced a new function subgraph_response_cache_key to generate unique keys for the response cache.
- Adjusted test cases to initialize the new response_cache field in Executor.
- Added a new test to verify the caching behavior when HTTP-level deduplication is disabled but plan-level deduplication is active.
lib/executor/src/executors/common.rs
- Added Hash, Hasher, and ResponseValue imports.
- Implemented the Hash trait for SubgraphExecutionRequest to enable consistent fingerprinting of requests.
- Created helper functions (hash_json_value, hash_variables, hash_extensions, hash_headers) to ensure stable hashing of complex data structures by sorting keys.
- Added comprehensive unit tests for the SubgraphExecutionRequest hashing logic, covering identical requests, reordered maps, and field changes.
lib/executor/src/executors/http.rs
- Renamed the request_fingerprint import to http_request_fingerprint to avoid naming conflicts.
- Introduced a new private helper method merged_request_headers to centralize the logic for merging request headers.
- Updated the execute method to use the new merged_request_headers helper and the renamed http_request_fingerprint.
lib/executor/src/response/subgraph_response.rs
- Derived the Clone trait for the SubgraphResponse struct to allow it to be stored and retrieved from the OnceCell cache.

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github-actions · 2026-02-17T17:57:57Z

🐋 This PR was built and pushed to the following Docker images:

Image Names: ghcr.io/graphql-hive/router

Platforms: linux/amd64,linux/arm64

Image Tags: ghcr.io/graphql-hive/router:pr-779 ghcr.io/graphql-hive/router:sha-ee3dd1b

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Implement per-plan subgraph request deduplication

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a bit cleaner

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kamilkisiela added 3 commits February 17, 2026 19:10

slightly different

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Update plan.rs

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Update plan.rs

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Implement per-plan subgraph request deduplication#779

Implement per-plan subgraph request deduplication#779
kamilkisiela wants to merge 5 commits intomainfrom
kamil-reuse-subgraph-responses

kamilkisiela commented Feb 17, 2026

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kamilkisiela commented Feb 17, 2026

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