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app-server: Only unload threads which were unused for some time (#17398)

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Currently app-server may unload actively running threads once the last
connection disconnects, which is not expected.
Instead track when was the last active turn & when there were any
subscribers the last time, also add 30 minute idleness/no subscribers
timer to reduce the churn.
This commit is contained in:
Ruslan Nigmatullin
2026-04-13 12:25:26 -07:00
committed by GitHub
parent d905376628
commit a5507b59c4
6 changed files with 495 additions and 160 deletions
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9
codex-rs/app-server/README.md
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@@ -143,7 +143,7 @@ Example with notification opt-out:
- `thread/memoryMode/set` — experimental; set a thread’s persisted memory eligibility to `"enabled"` or `"disabled"` for either a loaded thread or a stored rollout; returns `{}` on success.
- `thread/status/changed` — notification emitted when a loaded thread’s status changes (`threadId` + new `status`).
- `thread/archive` — move a thread’s rollout file into the archived directory; returns `{}` on success and emits `thread/archived`.
- `thread/unsubscribe` — unsubscribe this connection from thread turn/item events. If this was the last subscriber, the server shuts down and unloads the thread, then emits `thread/closed`.
- `thread/unsubscribe` — unsubscribe this connection from thread turn/item events. If this was the last subscriber, the server keeps the thread loaded and unloads it only after it has had no subscribers and no thread activity for 30 minutes, then emits `thread/closed`.
- `thread/name/set` — set or update a thread’s user-facing name for either a loaded thread or a persisted rollout; returns `{}` on success and emits `thread/name/updated` to initialized, opted-in clients. Thread names are not required to be unique; name lookups resolve to the most recently updated thread.
- `thread/unarchive` — move an archived rollout file back into the sessions directory; returns the restored `thread` on success and emits `thread/unarchived`.
- `thread/compact/start` — trigger conversation history compaction for a thread; returns `{}` immediately while progress streams through standard turn/item notifications.
@@ -338,11 +338,16 @@ When `nextCursor` is `null`, you’ve reached the final page.
- `notSubscribed` when the connection was not subscribed to that thread.
- `notLoaded` when the thread is not loaded.
If this was the last subscriber, the server unloads the thread and emits `thread/closed` and a `thread/status/changed` transition to `notLoaded`.
If this was the last subscriber, the server does not unload the thread immediately. It unloads the thread after the thread has had no subscribers and no thread activity for 30 minutes, then emits `thread/closed` and a `thread/status/changed` transition to `notLoaded`.
```json
{ "method": "thread/unsubscribe", "id": 22, "params": { "threadId": "thr_123" } }
{ "id": 22, "result": { "status": "unsubscribed" } }
```
Later, after the idle unload timeout:
```json
{ "method": "thread/status/changed", "params": {
"threadId": "thr_123",
"status": { "type": "notLoaded" }