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Python Environment: add gevent based WSGI server framework (#750)

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* Python Environment: add gevent based WSGI server framework

This supply gevent based WSGI server framework to Python Environment, to
allow customer to run their functions under multi-threads.

* classify the flask based application

This set up the flask based application as individual class, to make
sure the consistent and integrity.

* Add instruction of WSGI server selection applied in Python Environment

* Python Environment starting logger: provide framework name
This commit is contained in:
xiekeyang
2018-06-26 15:50:06 +08:00
committed by Ta-Ching Chen
parent c863616b38
commit 71d8b769d5
3 changed files with 109 additions and 80 deletions
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environments/python/README.md
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@@ -43,3 +43,23 @@ Or, if you already have an environment, you can update its image:
After this, fission functions that have the env parameter set to the
same environment name as this command will use this environment.
## Web Server Framework
Python environment build and start a WSGI server, to support high HTTP
traffic. As it is applied in different use cases, this provides two server
frameworks: `bjoern` and `gevent`. They all support high concurrency request.
`bjoern` has good performance on RPS, to be ideal for most light resource
utilization cases.
`gevent` is a good supplement because of its internal multi-threads. It
supports heavy resource load functions, with well distribution of response
time.
Python environment pod remains `bjoern` framework by default. And it runs `gevent`
framework by setting the container environment `WSGI_FRAMEWORK` value to `GEVENT`.
The environment value is configured normally in two ways. One way is to set in Dockerfile
and build it into image. The other way is to set in Kubernetes deployment spec during
pod running and restart it.