[App] Cold start proxy in autoscaler (#16094)

* cold start proxy

* Update src/lightning_app/components/serve/auto_scaler.py

* changelog

* better-doc

Co-authored-by: Akihiro Nitta <[email protected]>
Co-authored-by: thomas chaton <[email protected]>
Co-authored-by: Jirka Borovec <[email protected]>

(cherry picked from commit 7cbdc68)

Author: Sherin Thomas

docs/source-app/api_references.rst

@@ -46,6 +46,7 @@ ___________________
     ~multi_node.pytorch_spawn.PyTorchSpawnMultiNode
     ~multi_node.trainer.LightningTrainerMultiNode
     ~serve.auto_scaler.AutoScaler
+    ~serve.auto_scaler.ColdStartProxy
 
 ----
 

requirements/app/test.txt

@@ -4,6 +4,7 @@ pytest==7.2.0
 pytest-timeout==2.1.0
 pytest-cov==4.0.0
 pytest-doctestplus>=0.9.0
+pytest-asyncio==0.20.3
 playwright==1.28.0
 httpx
 trio<0.22.0

src/lightning_app/CHANGELOG.md

@@ -11,17 +11,25 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Added partial support for fastapi `Request` annotation in `configure_api` handlers ([#16047](https://github.com/Lightning-AI/lightning/pull/16047))
 
+
 - Added a nicer UI with URL and examples for the autoscaler component ([#16063](https://github.com/Lightning-AI/lightning/pull/16063))
 
+
 - Enabled users to have more control over scaling out/in interval ([#16093](https://github.com/Lightning-AI/lightning/pull/16093))
 
+
 - Added more datatypes to serving component ([#16018](https://github.com/Lightning-AI/lightning/pull/16018))
 
+
 - Added `work.delete` method to delete the work ([#16103](https://github.com/Lightning-AI/lightning/pull/16103))
 
+
 - Added `display_name` property to LightningWork for the cloud ([#16095](https://github.com/Lightning-AI/lightning/pull/16095))
 
 
+- Added `ColdStartProxy` to the AutoScaler ([#16094](https://github.com/Lightning-AI/lightning/pull/16094))
+
+
 ### Changed
 
 
@@ -31,7 +39,6 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - The utility `lightning.app.utilities.cloud.is_running_in_cloud` now returns `True` during loading of the app locally when running with `--cloud` ([#16045](https://github.com/Lightning-AI/lightning/pull/16045))
 
 
-
 ### Deprecated
 
 -
@@ -47,6 +54,17 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed `PythonServer` messaging "Your app has started" ([#15989](https://github.com/Lightning-AI/lightning/pull/15989))
 
 
+- Fixed auto-batching to enable batching for requests coming even after batch interval but is in the queue ([#16110](https://github.com/Lightning-AI/lightning/pull/16110))
+
+
+- Fixed a bug where `AutoScaler` would fail with min_replica=0 ([#16092](https://github.com/Lightning-AI/lightning/pull/16092)
+
+
+- Fixed a non-thread safe deepcopy in the scheduler ([#16114](https://github.com/Lightning-AI/lightning/pull/16114))
+
+
+- Fixed Http Queue sleeping for 1 sec by default if no delta were found ([#16114](https://github.com/Lightning-AI/lightning/pull/16114))
+
 
 ## [1.8.5] - 2022-12-15
 
@@ -71,13 +89,6 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed a bug where apps that had previously been deleted could not be run again from the CLI ([#16082](https://github.com/Lightning-AI/lightning/pull/16082))
 - Fixed install/upgrade - removing single quote ([#16079](https://github.com/Lightning-AI/lightning/pull/16079))
 
-- Fixed a bug where `AutoScaler` would fail with min_replica=0 ([#16092](https://github.com/Lightning-AI/lightning/pull/16092)
-
-
-- Fixed a non-thread safe deepcopy in the scheduler ([#16114](https://github.com/Lightning-AI/lightning/pull/16114))
-
-- Fixed Http Queue sleeping for 1 sec by default if no delta were found ([#16114](https://github.com/Lightning-AI/lightning/pull/16114))
-
 
 ## [1.8.4] - 2022-12-08
 

src/lightning_app/components/__init__.py

@@ -8,7 +8,7 @@
 )
 from lightning_app.components.python.popen import PopenPythonScript
 from lightning_app.components.python.tracer import Code, TracerPythonScript
-from lightning_app.components.serve.auto_scaler import AutoScaler
+from lightning_app.components.serve.auto_scaler import AutoScaler, ColdStartProxy
 from lightning_app.components.serve.gradio import ServeGradio
 from lightning_app.components.serve.python_server import Category, Image, Number, PythonServer, Text
 from lightning_app.components.serve.serve import ModelInferenceAPI
@@ -17,6 +17,7 @@
 
 __all__ = [
     "AutoScaler",
+    "ColdStartProxy",
     "DatabaseClient",
     "Database",
     "PopenPythonScript",

src/lightning_app/components/serve/__init__.py

@@ -1,6 +1,16 @@
-from lightning_app.components.serve.auto_scaler import AutoScaler
+from lightning_app.components.serve.auto_scaler import AutoScaler, ColdStartProxy
 from lightning_app.components.serve.gradio import ServeGradio
 from lightning_app.components.serve.python_server import Category, Image, Number, PythonServer, Text
 from lightning_app.components.serve.streamlit import ServeStreamlit
 
-__all__ = ["ServeGradio", "ServeStreamlit", "PythonServer", "Image", "Number", "Category", "Text", "AutoScaler"]
+__all__ = [
+    "ServeGradio",
+    "ServeStreamlit",
+    "PythonServer",
+    "Image",
+    "Number",
+    "Category",
+    "Text",
+    "AutoScaler",
+    "ColdStartProxy",
+]