celery5.2.1以下版本任务调用多耗费1秒
问题
5.0.5版本celery存在一个缺陷, 调用任务耗时多用1秒
这个问题在5.2.0, 5.1.2同样存在
没理解为什么到5.2.1版本才解决，甚至一度把celery排除python技术栈
环境描述
python3.6 celery5.0.5 windows 32位
调用celery任务代码摘要
# 1.send_task返回AsyncResult
# 2.AsyncResult的get()等待返回结果
# 3.get()会比真实多耗费1秒，并且每次请求都会出现
from celery import Celery
class xxxCelery(Celery):
def call_xxx(self, name, timeout=120, **kwargs):
LOG.info("send_task: %s" % locals())
start = time.time()
r = self.send_task(name, **kwargs)
g = eventlet.spawn(r.get, timeout=timeout)
result = g.wait()
print("cost: %s" % time.time()-start)
return
两个版本比对
分析celery源码之后，可以知道问题在drain_events()内部, 比较5.2.0和5.2.1版本
#celery/backends/asynchronuse.py
class greenletDrainer(Drainer):
...
def run(self):
self._started.set()
while not self._stopped.is_set():
try:
self.result_consumer.drain_events(timeout=1)
# 新增了两句, 估摸着是这个问题
self._send_drain_complete_event()
self._create_drain_complete_event()
except socket.timeout:
pass
self._shutdown.set()
解决办法
celery升级到5.2.1
python要升级到3.7以上版本(celery要求python3.7以上版本)
解决效果
耗时从1000多ms变成了30ms
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