Walkthrough

This PR refactors the TransferQueue integration to consolidate multi-role train/val clients into a unified single-controller approach. Method signatures across agent_loop, worker, and utils modules are updated to accept controller_info and config instead of separate controller_infos, storage_infos, and role parameters. Data operations shift to partition_id-based identifiers. Documentation receives extensive updates covering interfaces, customization patterns, and integration examples.

Changes

Sequence Diagram(s)

sequenceDiagram
    participant Trainer as RayPPOTrainer
    participant Controller as TransferQueueController
    participant Client as AsyncTransferQueueClient
    participant Storage as AsyncSimpleStorageManager

    Trainer->>Trainer: _initialize_data_system()
    Trainer->>Controller: Initialize (unified, single controller)
    Trainer->>Client: create_transferqueue_client(controller_info, config)
    Client->>Storage: initialize_storage_manager(config)
    
    Trainer->>Client: async_put(partition_id="train_X", data)
    Client->>Storage: Store at partition_id
    
    Trainer->>Client: async_get_meta(partition_id="train_X")
    Client->>Storage: Retrieve metadata
    
    Trainer->>Client: async_get_data(partition_id="train_X")
    Client->>Storage: Retrieve data

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Areas requiring extra attention:

• ray_trainer.py: Dense refactoring affecting data system initialization flow, RPC call migration from global_step to partition_id identifiers, and consolidated controller setup; validate logic correctness for train/val data routing
• transferqueue_utils.py: Removal of VAL client branching logic; ensure all conditional paths previously selecting per-role clients now correctly route through unified client
• API contract consistency: Verify all callers of create_transferqueue_client pass correct controller_info and config structure across agent_loop and worker modules

Possibly related PRs

• [data] feat: TransferQueue - Support managing multiple data partitions for Train/Val/Test in controller #43: Consolidates per-role train/val clients into a single controller/config API, implementing the same signature changes to create_transferqueue_client, removal of VAL client paths, and unified data system initialization.

Suggested reviewers

• baymax591
• 0oshowero0

Poem

🐰 A queue once split in train and val,
Now dances as a single cohort, whole and tall!
With partition_id tags and config in hand,
We unified the client—oh, what a grand land!
Storage sings in harmony, one controller reigns,
Transfer Queue flows sweetly through refactored veins. 🎉

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