resolve watcher high cpu usage

[pro4jhu]

version: 2.0.1
python version: 3.8.13
operate system: CentOS Linux release 7.9.2009

while syntax cause high cpu use, because of the different mechanism, below code when run in linux, it will use hign cpu. windows normal

test code:

import nacos
import yaml
from flask import Flask

app = Flask(name)

class NacosCofig:
namespace = "public"
group = "DEFAULT_GROUP"
server_name = "test"
server_port = "7004"
data_id = "test"
server_addresses = "http://127.0.0.1:8848"
server_ip = "127.0.0.1"

client = nacos.NacosClient(NacosCofig.server_addresses, namespace=NacosCofig.namespace)
yaml_data = yaml.load(client.get_config(NacosCofig.data_id, NacosCofig.group), Loader=yaml.FullLoader)

def start_nacos():
global yaml_data, client
client.add_config_watcher(NacosCofig.data_id, NacosCofig.group, _modify_config_cb)

def _modify_config_cb(config):
global yaml_data
yaml_data = yaml.load(client.get_config(NacosCofig.data_id, NacosCofig.group), Loader=yaml.FullLoader)
print(yaml_data)

def service_register():
global client
client.add_naming_instance(NacosCofig.server_name, NacosCofig.server_ip, NacosCofig.server_port,
ephemeral=False, group_name=NacosCofig.group, heartbeat_interval=5)

if name == 'main':
start_nacos()
service_register()
app.run(debug=False, port=7004, host="0.0.0.0")

before:

after:

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