Question

我使用apscheduler来执行常规作业，但我遇到了一些错误。

＆＃34;查询期间与MySQL服务器的连接丢失＆＃34;

为了找到答案，我尝试对它进行一些测试，并发现我的数据库（MySQL）＆＃34; wait_timeout＆＃34;小于调度间隔时间然后发生此错误。（对不起，我犯了一些错误......不到......）

在测试中：

我的工作设置

scheduler.add_job（period_job，＆＃39; interval＆＃39;，minutes = 5，id =＆＃39; my_job_id＆＃39;）
我的数据库设置

wait_timeout = 60

我的测试代码

from apscheduler.schedulers.background import BackgroundScheduler
from flask import Flask
app = Flask(__name__)

scheduler = BackgroundScheduler({'apscheduler.jobstores.default': {
        'type': 'sqlalchemy',
        'url': 'mysql+pymysql://user:pass@url: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()

总错误信息：

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}]

有谁知道发生了什么事？以及如何解决它？

Answer 1

interactive_timeout的设置是什么？

<强> WAIT_TIMEOUT：

描述：服务器在关闭连接之前等待连接变为活动状态的时间（以秒为单位）。当线程从全局值启动时，如果连接是非交互式，则会初始化会话值，如果连接是交互式的，则从interactive_timeout值启动会话值。

apscheduler在查询期间丢失了与MySQL服务器的连接

1 个答案: