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[GH-ISSUE #423] Clarification on C++ function flow and asynchronous execution in 3FS #242

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opened 2026-10-26 09:47:41 +00:00 by bsakaguchi · 0 comments
bsakaguchi commented 2026-10-26 09:47:41 +00:00
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Originally created by @jsramesh1990 on GitHub (Aug 18, 2026).
Original GitHub issue: https://github.com/deepseek-ai/3FS/issues/423

Hi,

I am trying to understand the asynchronous execution model used in 3FS.

When a client performs a read/write operation, I see that the operation
eventually completes asynchronously.

Could someone explain the C++ function call flow for one complete request?

Specifically:

  1. Which function is the initial entry point?
  2. Which object owns the asynchronous request?
  3. How is the request submitted?
  4. What mechanism is used to notify completion?
  5. Where is the callback/future/promise triggered?
  6. How does the result finally return to the original caller?
  7. How are object lifetimes managed while the operation is pending?

A simplified example such as:

request()
-> submit()
-> async operation
-> RDMA/network
-> completion
-> callback
-> return result

would help me understand the C++ architecture.

I am mainly interested in the actual C++ classes/functions involved and
their call sequence.

Originally created by @jsramesh1990 on GitHub (Aug 18, 2026). Original GitHub issue: https://github.com/deepseek-ai/3FS/issues/423 Hi, I am trying to understand the asynchronous execution model used in 3FS. When a client performs a read/write operation, I see that the operation eventually completes asynchronously. Could someone explain the C++ function call flow for one complete request? Specifically: 1. Which function is the initial entry point? 2. Which object owns the asynchronous request? 3. How is the request submitted? 4. What mechanism is used to notify completion? 5. Where is the callback/future/promise triggered? 6. How does the result finally return to the original caller? 7. How are object lifetimes managed while the operation is pending? A simplified example such as: request() -> submit() -> async operation -> RDMA/network -> completion -> callback -> return result would help me understand the C++ architecture. I am mainly interested in the actual C++ classes/functions involved and their call sequence.
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