from fastapi import FastAPI\nfrom fastapi.middleware.cors import CORSMiddleware\nimport uvicorn\nimport time\nfrom loguru import logger\nfrom apscheduler.schedulers.background import BackgroundScheduler\n\napp = FastAPI()\napp.add_middleware(\n CORSMiddleware,\n allow_origins=["*"],\n allow_credentials=True,\n allow_methods=["*"],\n allow_headers=["*"],\n)\n\ntest_list = ["1"]*10\n\ndef check_list_len():\n global test_list\n while True:\n time.sleep(5)\n logger.info(f"check_list_len\xef\xbc\x9a{len(test_list)}")\n\n@app.on_event('startup')\ndef init_data():\n scheduler = BackgroundScheduler()\n scheduler.add_job(check_list_len, 'cron', second='*/5')\n scheduler.start()\n\n@app.get("/pop")\nasync def list_pop():\n global test_list\n test_list.pop(1)\n logger.info(f"current_list_len:{len(test_list)}")\n\n\nif __name__ == '__main__':\n uvicorn.run(app="main3:app", host="0.0.0.0", port=80, reload=False, debug=False)\n上面是我的代码，我想通过get请求取出一个列表元素，并设置一个周期性任务不断检查列表中的元素数量，但是当我运行时，总是出现以下错误：
\nExecution of job "check_list_len (trigger: cron[second='*/5'], next run at: 2021-11-25 09:48:50 CST)" skipped: maximum number of running instances reached (1)\n2021-11-25 09:48:50.016 | INFO | …