Glusterfs session #4 call frame and programming model

Apr 26, 20211 like66 views

Glusterfs uses an asynchronous programming model where each component (xlator) calls into the next using STACK_WIND, passing a callback. The next xlator performs its task and then callbacks the original using STACK_UNWIND. This non-blocking approach prevents any xlator from blocking on network operations. Key data structures like the call_frame track the asynchronous call and callback between xlators, maintaining a stack. Debugging information within frames helps track errors like frame loss or stuck operations.

Glusterfs Session #4
Call_frame and programming model

Scope
- What is the programming model used in gluster
- Why this model is used
- What are the data structures that help with implementing it

What is the programming model used in gluster
- Glusterfs xlators use asynchronous programming model.
- Each xlator calls into the other xlator using a macro called STACK_WIND
giving it a callback function
- The other xlator once it finishes its part callback using the callback function
passed using STACK_UNWIND macro

Why this model is used
- Any xlator can’t assume what the other xlator is going to do with the fop
- If the xlator(Like client xlator) does a network operation, blocking the calling
xlator until response comes from server will kill performance. So non-blocking
sockets are used for communication.
- This forces every xlator to follow asynchronous programming model using
call/callback model.

Code walkthrough
- Stack wind and variants
- Stack unwind and variants
- C stack and gluster stack

$Difference between C stack and gluster stack struct _call_frame { call_stack_t *root; /* stack root */ call_frame_t *parent; /* previous BP */ struct list_head frames; gf_lock_t lock; void *cookie; /* unique cookie */ xlator_t *this; /* implicit object */ ret_fn_t ret; /* op_return address */ ... };$

$Call_frame_t continued struct _call_frame { ... void *local; /* local variables */ glusterfs_fop_t op; int32_t complete; const char *wind_from; const char *wind_to; const char *unwind_from; const char *unwind_to; };$

Stack-wind/unwind with cluster xlators
- Demo that shows the importance of call-count
- local is not accessed once all stack-winds are complete
- Demo

Debug information in frames
- What information is stored for debugging purposes
- How to debug frame-loss/stuck frames using statedumps
- Demo completed=0
- Demo how to look at frames and interpret

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Glusterfs session #4 call frame and programming model

1. Glusterfs Session #4 Call_frame and programming model

2. Scope - What is the programming model used in gluster - Why this model is used - What are the data structures that help with implementing it

3. What is the programming model used in gluster - Glusterfs xlators use asynchronous programming model. - Each xlator calls into the other xlator using a macro called STACK_WIND giving it a callback function - The other xlator once it finishes its part callback using the callback function passed using STACK_UNWIND macro

4. Why this model is used - Any xlator can’t assume what the other xlator is going to do with the fop - If the xlator(Like client xlator) does a network operation, blocking the calling xlator until response comes from server will kill performance. So non-blocking sockets are used for communication. - This forces every xlator to follow asynchronous programming model using call/callback model.

6. Code walkthrough - Stack wind and variants - Stack unwind and variants - C stack and gluster stack

7. Difference between C stack and gluster stack struct _call_frame { call_stack_t *root; /* stack root */ call_frame_t *parent; /* previous BP */ struct list_head frames; gf_lock_t lock; void *cookie; /* unique cookie */ xlator_t *this; /* implicit object */ ret_fn_t ret; /* op_return address */ ... };

8. Call_frame_t continued struct _call_frame { ... void *local; /* local variables */ glusterfs_fop_t op; int32_t complete; const char *wind_from; const char *wind_to; const char *unwind_from; const char *unwind_to; };

9. Stack-wind/unwind with cluster xlators - Demo that shows the importance of call-count - local is not accessed once all stack-winds are complete - Demo

10. Debug information in frames - What information is stored for debugging purposes - How to debug frame-loss/stuck frames using statedumps - Demo completed=0 - Demo how to look at frames and interpret

11. Q & A

Glusterfs session #4 call frame and programming model

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