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我使用apscheduler執行常規作業，並且出現了一些錯誤。apscheduler在查詢期間丟失了與MySQL服務器的連接
爲了找到答案「查詢時MySQL服務器失去連接」，我嘗試一些關於它的測試，並發現瞭如果我的數據庫（MySQL的）「WAIT_TIMEOUT」小於計劃間隔時間，然後這個錯誤發生。 （這裏對不起，我弄錯了......不到......）
測試：
我的任務設置
scheduler.add_job（period_job， '間隔'，分鐘= 5，ID = 'my_job_id'）
我的數據庫中設置
WAIT_TIMEOUT = 60
我的測試代碼
from apscheduler.schedulers.background import BackgroundScheduler from flask import Flask app = Flask(__name__) scheduler = BackgroundScheduler({'apscheduler.jobstores.default': { 'type': 'sqlalchemy', 'url': 'mysql+pymysql://user:[email protected]:3306/test_apscheduler?charset=utf8' }, 'apscheduler.executors.default': { 'class': 'apscheduler.executors.pool:ThreadPoolExecutor', 'max_workers': '20' }, 'apscheduler.executors.processpool': { 'type': 'processpool', 'max_workers': '5' }, 'apscheduler.job_defaults.coalesce': 'false', 'apscheduler.job_defaults.max_instances': '3', 'apscheduler.timezone': 'UTC', }) scheduler.start() @app.route('/') def hello_world(): scheduler.add_job(period_job, 'interval', minutes=5, id='my_job_id') return 'Hello World!' def period_job(): print("hihi") if __name__ == '__main__': app.run()
總錯誤信息：
Exception in thread APScheduler:
Traceback (most recent call last):
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 1139, in _execute_context context)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\default.py", line 450, in do_execute cursor.execute(statement, parameters)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\cursors.py", line 158, in execute result = self._query(query)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\cursors.py", line 308, in _query conn.query(q)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 820, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 1002, in _read_query_result result.read()
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 1285, in read first_packet = self.connection._read_packet()
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 946, in _read_packet packet_header = self._read_bytes(4)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 982, in _read_bytes 2013, "Lost connection to MySQL server during query")
pymysql.err.OperationalError: (2013, 'Lost connection to MySQL server during query')
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Python34\lib\threading.py", line 921, in _bootstrap_inner self.run()
File "C:\Python34\lib\threading.py", line 869, in run self._target(*self._args, **self._kwargs)
File "C:\Users\skuo\apshcduler\lib\site-packages\apscheduler\schedulers\blocking.py", line 27, in _main_loop wait_seconds = self._process_jobs()
File "C:\Users\skuo\apshcduler\lib\site-packages\apscheduler\schedulers\base.py", line 801, in _process_jobs for job in jobstore.get_due_jobs(now):
File "C:\Users\skuo\apshcduler\lib\site-packages\apscheduler\jobstores\sqlalchemy.py", line 69, in get_due_jobs return self._get_jobs(self.jobs_t.c.next_run_time <= timestamp)
File "C:\Users\skuo\apshcduler\lib\site-packages\apscheduler\jobstores\sqlalchemy.py", line 131, in _get_jobs for row in self.engine.execute(selectable):
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 1991, in execute return connection.execute(statement, *multiparams, **params)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 914, in execute return meth(self, multiparams, params)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\sql\elements.py", line 323, in _execute_on_connection return connection._execute_clauseelement(self, multiparams, params)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 1010, in _execute_clauseelement compiled_sql, distilled_params
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 1146, in _execute_context context)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 1341, in _handle_dbapi_exception exc_info
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\util\compat.py", line 200, in raise_from_cause reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\util\compat.py", line 183, in reraise raise value.with_traceback(tb)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\base.py", line 1139, in _execute_context context)
File "C:\Users\skuo\apshcduler\lib\site-packages\sqlalchemy\engine\default.py", line 450, in do_execute cursor.execute(statement, parameters)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\cursors.py", line 158, in execute result = self._query(query)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\cursors.py", line 308, in _query conn.query(q)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 820, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 1002, in _read_query_result result.read()
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 1285, in read first_packet = self.connection._read_packet()
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 946, in _read_packet packet_header = self._read_bytes(4)
File "C:\Users\skuo\apshcduler\lib\site-packages\pymysql\connections.py", line 982, in _read_bytes 2013, "Lost connection to MySQL server during query")
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2013, 'Lost connection to MySQL server during query') [SQL: 'SELECT apscheduler_jobs.id, apscheduler_jobs.job_state \nFROM apscheduler_jobs \nWHERE apscheduler_jobs.next_run_time <= %(next_run_time_1)s ORDER BY apscheduler_jobs.next_run_time'] [parameters: {'next_run_time_1': 1457445220.361246}]
沒有人知道發生了什麼呢？以及如何解決它？
什麼是interactive_timeout –