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.kiro/specs/scheduler-controller-msg-gap/design.md
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.kiro/specs/scheduler-controller-msg-gap/design.md
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# Design: scheduler-controller-msg-gap
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> Feature: scheduler-controller-msg-gap
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> Created: 2026-05-11
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> Status: Design Generated
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## Architecture Pattern & Boundary Map
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**Pattern:** Extension of existing message handler infrastructure. The scheduler uses a two-phase processing model:
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1. **Enqueue phase** (handler.c, runs on IO thread) — lightweight: validate, allocate request struct, enqueue into `pend_updates[0]`
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2. **Dequeue phase** (scheduler.c `sched_update()`, runs on main thread) — heavyweight: mutate scheduler state, call plugin hooks, trigger scheduling sessions
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All new handlers follow this pattern. No architectural boundary changes needed.
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**Scope boundary:** Only `src/scheduler/` source files, `src/lib/helper.c`, and `src/include/helper.h` are modified. No controller-side changes. No Cap'n Proto schema changes.
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## Technology Stack & Alignment
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| Aspect | Choice | Rationale |
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|--------|--------|-----------|
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| Language | C99 | Matches existing codebase convention |
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| IPC protocol | Cap'n Proto (existing) | No schema changes — only handler gaps filled |
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| Build system | Meson (existing) | No build changes needed |
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| Threading model | Same as existing — handler enqueues, main thread dequeues | Preserves thread safety guarantees |
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| Logging | Existing `TRACE`/`INFO`/`WARN`/`ERROR` macros | Consistent with codebase |
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| Plugin hooks | Follow existing `plugin_*_update()` pattern | Consistency with established plugin API |
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## Components & Interface Contracts
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### Component 1: handler.c — Notify handlers (Req 3, 4, 5, 6)
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Extend `sched_handle_notify()` to process the four currently-stubbed NotifyData events.
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#### `sched_handle_sched_update_job`
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```
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Signature: static int sched_handle_sched_update_job(
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xce_scheduler_t* sched,
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xce_job_t* job)
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Behavior:
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- If job == NULL, return -EINVAL
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- Enqueue XCE_SCHED_OP_UPDATE_JOB with job pointer
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- On calloc failure, return -ENOMEM
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- Return 0 on success
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```
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**Requirement traceability:** 3.1, 3.2, 3.3
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#### `sched_handle_sched_update_queue`
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```
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Signature: static int sched_handle_sched_update_queue(
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xce_scheduler_t* sched,
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xce_queue_t* queue)
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Behavior:
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- If queue == NULL, return -EINVAL
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- Enqueue XCE_SCHED_OP_UPDATE_QUEUE with queue pointer
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- On calloc failure, return -ENOMEM
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- Return 0 on success
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```
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**Requirement traceability:** 4.1, 4.2, 4.3
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#### `sched_handle_sched_update_resvals`
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```
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Signature: static int sched_handle_sched_update_resvals(
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xce_scheduler_t* sched,
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xce_resval_list_t* resvals)
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Behavior:
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- If resvals == NULL or count == 0, return 0
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- Enqueue XCE_SCHED_OP_UPDATE_RESVALS with resvals pointer
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- On calloc failure, return -ENOMEM
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- Return 0 on success
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```
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**Requirement traceability:** 5.1, 5.2, 5.3
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#### `sched_handle_sched_job_rusage`
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```
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Signature: static int sched_handle_sched_job_rusage(
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xce_scheduler_t* sched,
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xce_job_rusages_t* rusages)
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Behavior:
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- If rusages == NULL, return -EINVAL
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- Enqueue XCE_SCHED_OP_JOB_RUSAGE with rusages pointer
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- On calloc failure, return -ENOMEM
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- Return 0 on success
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```
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**Requirement traceability:** 6.1, 6.2, 6.3
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#### `sched_handle_notify` switch changes
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The existing switch in `sched_handle_notify()` gains four new cases:
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| NotifyData event | Handler function | Previous behavior |
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|---|---|---|
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| `NotifyData_data_schedUpdateJob` | `sched_handle_sched_update_job(sched, notify->data.sched_update_job)` | TRACE log only |
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| `NotifyData_data_schedUpdateQueue` | `sched_handle_sched_update_queue(sched, notify->data.sched_update_queue)` | Empty `break` |
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| `NotifyData_data_schedUpdateResvals` | `sched_handle_sched_update_resvals(sched, notify->data.sched_update_resvals)` | Empty `break` |
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| `NotifyData_data_schedJobRusages` | `sched_handle_sched_job_rusage(sched, notify->data.sched_job_rusages)` | Empty `break` |
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### Component 2: handler.c — Dataset handlers (Req 1)
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#### `sched_handle_resources`
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```
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Signature: static int sched_handle_resources(
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xce_scheduler_t* sched,
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xce_resource_data_t* resdata)
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Behavior:
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- If resdata == NULL or resdata->count == 0, return 0
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- Enqueue XCE_SCHED_OP_UPDATE_RESOURCES with resdata pointer
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- On calloc failure, return -ENOMEM
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- Return 0 on success
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```
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**Requirement traceability:** 1.1, 1.3, 1.4
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#### `sched_handle_resvals`
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```
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Signature: static int sched_handle_resvals(
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xce_scheduler_t* sched,
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xce_resval_data_t* resvaldata)
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Behavior:
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- If resvaldata == NULL or resvaldata->count == 0, return 0
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- Enqueue XCE_SCHED_OP_UPDATE_RESVALS_FULL with resvaldata pointer
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- On calloc failure, return -ENOMEM
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- Return 0 on success
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```
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**Requirement traceability:** 1.2, 1.3, 1.4
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#### `sched_handle_dataset` switch changes
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| Data table | Handler function | Previous behavior |
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|---|---|---|
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| `Data_data_resources` | `sched_handle_resources(sched, dataset->data.resources)` | Empty `break` |
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| `Data_data_resvals` | `sched_handle_resvals(sched, dataset->data.resvals)` | Empty `break` |
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### Component 3: scheduler.h — New op types and update request fields
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Extend `xce_sched_op_t` and `xce_sched_update_request_t`:
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```
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typedef enum {
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XCE_SCHED_OP_NONE = 0,
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XCE_SCHED_OP_UPDATE_CONFIG,
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XCE_SCHED_OP_UPDATE_JOB,
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XCE_SCHED_OP_JSTATE_CHANGE,
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XCE_SCHED_OP_UPDATE_WORKER,
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XCE_SCHED_OP_UPDATE_QUEUE, // NEW
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XCE_SCHED_OP_UPDATE_RESOURCES, // NEW
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XCE_SCHED_OP_UPDATE_RESVALS_FULL, // NEW — from dataset bulk resvals
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XCE_SCHED_OP_UPDATE_RESVALS, // NEW — from notify incremental resvals
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XCE_SCHED_OP_JOB_RUSAGE // NEW
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} xce_sched_op_t;
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```
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Extend `xce_sched_update_request_t` union:
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```
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struct {
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xce_queue_t* queue; // for UPDATE_QUEUE
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} queueupdate;
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struct {
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xce_resource_data_t* resdata; // for UPDATE_RESOURCES
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} resourceupdate;
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struct {
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xce_resval_data_t* resvaldata; // for UPDATE_RESVALS_FULL
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} resvalfullupdate;
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struct {
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xce_resval_list_t* resvals; // for UPDATE_RESVALS (notify)
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} resvalupdate;
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struct {
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xce_job_rusages_t* rusages; // for JOB_RUSAGE
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} job_rusage;
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```
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### Component 4: scheduler.c — Dequeue processing in `sched_update()`
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Extend the `switch (req->op)` in `sched_update()` with new cases:
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#### `XCE_SCHED_OP_UPDATE_QUEUE`
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- Find existing queue by name with `sched_get_queue()`
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- If found: update mutable fields (status, priority, accept_interval, sched_delay, resreq)
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- If not found: return `-ENOENT` — queues are created only via the initial `Conf4Sched` config push, never via notify
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- Call `plugin_queue_update()`
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**Requirement traceability:** 4.1, 4.2
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#### `XCE_SCHED_OP_UPDATE_RESOURCES`
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- Iterate `resdata->resources[]`
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- For each: call `makeResource(sched->resmgr, r)` to add or update
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- NULL entries skipped (1.3)
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**Requirement traceability:** 1.1
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#### `XCE_SCHED_OP_UPDATE_RESVALS_FULL`
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- Iterate `resvaldata->vals[]`
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- For each: find resource by name in `sched->resmgr`, update value
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- Unknown resources skipped with WARN log
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**Requirement traceability:** 1.2
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#### `XCE_SCHED_OP_UPDATE_RESVALS`
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- Iterate `resvals->vals[]`
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- For each: find worker by host name via `sched_get_worker()`
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- If found: update worker's `resvals` zarray at the resource index
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- Unknown hosts skipped (5.2)
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**Requirement traceability:** 5.1, 5.2, 5.3
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#### `XCE_SCHED_OP_JOB_RUSAGE`
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- Find job by jobid via `sched_get_job()`
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- If not found: return `-ENOENT` (6.2)
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- Store rusage data on job object
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- Call `plugin_job_rusage_update()`
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**Requirement traceability:** 6.1, 6.2
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### Component 5: scheduler.c — Job update-in-place (Req 3)
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#### New function: `sched_update_existing_job`
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```
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Signature: static int sched_update_existing_job(
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xce_scheduler_t* sched,
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xce_job_t* updated)
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Behavior:
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- Find existing job by jobid via sched_get_job()
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- If not found: return -ENOENT — jobs are created only via
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the Data_data_schedjobs dataset push, never via notify
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- If found: update mutable fields (state, priority, allocs)
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- Call plugin_job_update()
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- Return 0 on success, negative on error
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```
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**Requirement traceability:** 3.1, 3.2, 3.3
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This is wired into the existing `XCE_SCHED_OP_UPDATE_JOB` case — no new op type needed since `sched_on_jobs()` already creates new jobs. The change is to make `sched_update_jobs()` also handle job updates for existing jobids by replacing rather than just adding.
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### Component 6: plugin.h / plugin.c — New rusage hook (Req 6)
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Add to `plugin_hooks_t`:
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```
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typedef int (*plugin_job_rusage_hook_t)(void*, xce_sched_job_t*, xce_job_rusages_t*);
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```
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Add to `plugin_hooks_t` struct:
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```
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plugin_job_rusage_hook_t rusage_hook;
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```
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Add global function:
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```
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int plugin_job_rusage_update(void* sched, xce_sched_job_t* job, xce_job_rusages_t* rusages);
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```
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This follows the exact pattern of `plugin_job_state_change()` — iterate registered plugins, call their hook if non-NULL.
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### Component 7: handler.c — Dead code removal (Req 2)
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Remove from `scheduler_req_handler()`:
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- The entire `Request_body_pushmsg` case block (lines 185–198)
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- The static functions `sched_handle_jobpush()` and `sched_handle_workerpush()`
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These are unreachable because `vtask_entry()` in `src/lib/xcectx.c` rewrites all `pushmsg` into `datamsg`.
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**Requirement traceability:** 2.1, 2.2
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### Component 8: helper.c / helper.h — Name-lookup functions (Req 8)
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#### New function: `xce_notify_event_name`
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```
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Signature: char* xce_notify_event_name(int event)
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Behavior: Switch onNotifyData_data_* enum values, return symbolic string.
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Fallback: "UNKNOWN(%d)" with numeric substitution.
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```
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Matches pattern of `xce_dataset_table()` — takes int, returns `char*`.
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#### New function: `xce_sched_op_name`
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```
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Signature: char* xce_sched_op_name(xce_sched_op_t op)
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Behavior: Switch on XCE_SCHED_OP_* enum values, return symbolic string.
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Fallback: "UNKNOWN(%d)" with numeric substitution.
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```
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Required for Requirement 7's error logging in `sched_update()`.
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#### Changes to `handler.c` logging
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| Current | Changed to |
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|---|---|
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| `TRACE("%s table = %d", __func__, dataset->table)` | `TRACE("%s table = %s", __func__, xce_dataset_table(dataset->table))` |
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| `TRACE("%s...", __func__)` (in stub handlers) | `INFO("%s event = %s jobid = %s", __func__, xce_notify_event_name(notify->event), jobidString)` |
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**Requirement traceability:** 8.1, 8.2, 8.3, 8.4
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### Component 9: scheduler.c — Error logging in `sched_update()` (Req 7)
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In the `sched_update()` main loop, after the `switch (req->op)` block, when `rc < 0`:
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```
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WARN("%s: op %s failed: %s (%d)", __func__,
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xce_sched_op_name(req->op), strerror(-rc), rc);
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```
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**Requirement traceability:** 7.1
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### Component 10: schedobj.c — Queue update function (Req 4)
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#### New function: `sched_update_existing_queue`
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```
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Signature: int sched_update_existing_queue(
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xce_scheduler_t* sched,
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xce_queue_t* updated)
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Behavior:
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- Find existing queue by name via sched_get_queue()
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- If not found: return -ENOENT — queues are created only via
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the initial Conf4Sched config push, never via notify
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- If found: update mutable fields:
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sched_queue->status = updated->status
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sched_queue->priority = updated->priority
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sched_queue->accept_interval = updated->accept_interval
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sched_queue->sched_delay = updated->sched_delay
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// resreq is a string field — reallocate and replace
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- Call plugin_queue_update()
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- Return 0 on success, negative on error
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```
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**Requirement traceability:** 4.1, 4.2
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### Component 11: `sched_pend_update_killer` updates (scheduler.c)
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Extend the `sched_pend_update_killer` destructor to handle new op types:
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```
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case XCE_SCHED_OP_UPDATE_QUEUE:
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// queue pointer belongs to scheduler, no free needed
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break;
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case XCE_SCHED_OP_UPDATE_RESOURCES:
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// resource_data rows belong to scheduler, no free needed
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break;
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case XCE_SCHED_OP_UPDATE_RESVALS_FULL:
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// resval_data rows owned by capnp decode, freed by free_Request
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break;
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case XCE_SCHED_OP_UPDATE_RESVALS:
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// resval_list owned by capnp decode, freed by free_Request
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break;
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case XCE_SCHED_OP_JOB_RUSAGE:
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// rusage struct owned by capnp decode, freed by free_Request
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break;
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```
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**Important:** Memory ownership must be traced carefully. For `XCE_SCHED_OP_UPDATE_JOB` and `XCE_SCHED_OP_UPDATE_WORKER`, the existing pattern nullifies `dataset->nrows` and `dataset->rows` after enqueue to transfer ownership. New queue/rusage/resvals handlers should follow the same pattern — the request struct owns the data, and `free_Request()` in `xcectx.c` handles cleanup.
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## Data Flow Diagrams
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### Notify message processing flow
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```
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Controller (sched.c) Scheduler (handler.c) Scheduler (scheduler.c)
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───────────────────── ───────────────────── ─────────────────────
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xce_notify_req()
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│
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├── schedStartJob ──────────► sched_job_state_change() ──► enq_pend_update(JSTATE_CHANGE)
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│ │
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├── schedExitJob ───────────► sched_job_state_change() ──► │
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│ │
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├── schedFailJob ───────────► sched_job_state_change() ──► │
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│ │
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├── schedUpdateJob ────────► sched_handle_sched_update_job() ─► enq_pend_update(UPDATE_JOB) [NEW]
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│ │
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├── schedUpdateQueue ──────► sched_handle_sched_update_queue() ─► enq_pend_update(UPDATE_QUEUE) [NEW]
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│ │
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├── schedUpdateResvals ────► sched_handle_sched_update_resvals() ─► enq_pend_update(UPDATE_RESVALS) [NEW]
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│ │
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└── schedJobRusages ───────► sched_handle_sched_job_rusage() ──► enq_pend_update(JOB_RUSAGE) [NEW]
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│
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▼
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sched_update() main loop
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├── UPDATE_JOB ──► sched_update_existing_job()
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├── UPDATE_QUEUE ──► sched_update_existing_queue()
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├── UPDATE_RESVALS ──► update worker resvals
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├── UPDATE_RESOURCES ──► update resmgr [NEW]
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├── UPDATE_RESVALS_FULL ──► update sharedInst [NEW]
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└── JOB_RUSAGE ──► store on job + plugin hook [NEW]
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```
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### Dataset message processing flow
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```
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Controller (dataex.c) Scheduler (handler.c) Scheduler (scheduler.c)
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──────────────────── ───────────────────── ─────────────────────
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xce_push_data_req()
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│
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├── Data_data_schedjobs ──► sched_on_jobs() ──────────► enq_pend_update(UPDATE_JOB)
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│ │
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├── Data_data_schedworkers ► sched_on_workers() ───────► enq_pend_update(UPDATE_WORKER)
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│ │
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├── Data_data_resources ──► sched_handle_resources() ─► enq_pend_update(UPDATE_RESOURCES) [NEW]
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│ │
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└── Data_data_resvals ────► sched_handle_resvals() ───► enq_pend_update(UPDATE_RESVALS_FULL) [NEW]
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│
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▼
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sched_update() main loop
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```
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||||
## File Change Summary
|
||||
|
||||
| File | Change Type | Requirements |
|
||||
|------|-------------|-------------|
|
||||
| `src/scheduler/src/handler.c` | Modified — add handlers, remove dead code, update logging | 1, 2, 3, 4, 5, 6, 8 |
|
||||
| `src/scheduler/include/scheduler.h` | Modified — extend enums and structs | 1, 3, 4, 5, 6 |
|
||||
| `src/scheduler/src/scheduler.c` | Modified — add dequeue cases, error logging, update functions | 1, 3, 4, 5, 6, 7 |
|
||||
| `src/scheduler/include/plugin.h` | Modified — add rusage hook typedef and global function | 6 |
|
||||
| `src/scheduler/src/plugin.c` | Modified — add `plugin_job_rusage_update()` implementation | 6 |
|
||||
| `src/scheduler/src/schedobj.c` | Modified — add `sched_update_existing_queue()` | 4 |
|
||||
| `src/lib/helper.c` | Modified — add `xce_notify_event_name()`, `xce_sched_op_name()` | 8 |
|
||||
| `src/include/helper.h` | Modified — add function declarations | 8 |
|
||||
| `src/scheduler/testsuite/test.c` | Modified — add unit tests for all new handlers | All |
|
||||
|
||||
## Build Order
|
||||
|
||||
1. `src/include/helper.h` — add declarations (no dependencies)
|
||||
2. `src/lib/helper.c` — add implementations (depends on step 1)
|
||||
3. `src/scheduler/include/scheduler.h` — extend enums and structs (depends on typemap headers)
|
||||
4. `src/scheduler/include/plugin.h` — add rusage hook typedef (depends on xce/types.h)
|
||||
5. `src/scheduler/src/plugin.c` — add `plugin_job_rusage_update()` (depends on step 4)
|
||||
6. `src/scheduler/src/schedobj.c` — add `sched_update_existing_queue()` (depends on step 3)
|
||||
7. `src/scheduler/src/scheduler.c` — add dequeue processing, error logging, update functions (depends on steps 3–6)
|
||||
8. `src/scheduler/src/handler.c` — add handlers, remove dead code, update logging (depends on steps 1–7)
|
||||
9. `src/scheduler/testsuite/test.c` — add unit tests (depends on all above)
|
||||
|
||||
## Risks & Mitigations
|
||||
|
||||
| Risk | Severity | Mitigation |
|
||||
|------|----------|-----------|
|
||||
| Memory ownership of queued data — capnp-decoded structs freed before dequeue processes them | High | Follow existing pattern: for dataset paths, nullify `dataset->nrows`/`dataset->rows` after enqueue to transfer ownership. For notify paths, copy essential data into the request struct rather than holding pointers to capnp memory. |
|
||||
| `sched_update_existing_job` must handle concurrent modification — handler thread enqueues while main thread processes | Medium | Already mitigated by existing double-buffer swap in `sched_update()`. The handler thread only touches `pend_updates[0]` while the main thread drains `pend_updates[1]`. |
|
||||
| New `UPDATE_QUEUE` op requires queue name lookup — potential lock contention | Low | `sched_get_queue()` already uses read lock. Queue updates are infrequent. |
|
||||
| `xce_sched_op_name` must handle future enum additions | Low | Follow `xce_dataset_table` pattern — return `"UNKNOWN(%d)"` for unrecognized values. |
|
||||
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