Can't run Flask+gevent with milvus connections.connect

[sealzjh]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

`
from flask import Flask
from pymilvus import connections, Collection

app = Flask(name)

milvus_config = {
"host": "127.0.0.1",
"port": "19530",
"cover_table": "trend_cover_cnnvec"
}
connections.connect(
alias="default",
host=milvus_config['host'],
port=milvus_config['port']
)
cover_collection = Collection(milvus_config["cover_table"])

@app.route("/health")
def health():
return "ok"

if name == 'main':
app.run(host='0.0.0.0', port=5000)
`

Expected Behavior

不能启动

gunicorn -w 1 -b 0.0.0.0:5000 main:app -k gevent

正常启动

gunicorn -w 1 -b 0.0.0.0:5000 main:app -k eventlet

Steps/Code To Reproduce behavior

run service timeout

Environment details

pymilvus==2.2.6

Anything else?

No response

[xiaofan-luan]

/assign @XuanYang-cn could you help to verifying that

[XuanYang-cn]

@sealzjh According to grpc team, you need a special patch to make grpc work with gevent, I tested it myself and it works.

Be sure to init_gevent before connect()

grpc/grpc#4629 (comment)

[XuanYang-cn]

/unassign
/assign @sealzjh