我运行一个Python Djanogo应用程序，一天一次向数据库发出请求。
while True:
today = datetime.date.today()
for _ in range(3):
print("checking...")
# Access objects in the database.
events = Event.objects.filter(deadline__gt=last, deadline__lt=today, processed=False)
#Sleep once day.
sleep(24*60*60)
我从python应用程序附加日志文件时收到错误，并且还附加了MySQL日志中的文件。
Python app log
0 events resolved.
checking...
0 events resolved.
checking...
Traceback (most recent call last):
File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Python36\lib\site-packages\django\db\backends\mysql\base.py", line 101, in execute
return self.cursor.execute(query, args)
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "C:\Python36\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 247, in execute
res = self._query(query)
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 374, in _do_query
db.query(q)
File "C:\Python36\lib\site-packages\MySQLdb\connections.py", line 277, in query
_mysql.connection.query(self, query)
_mysql_exceptions.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 "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "C:\Python36\lib\site-packages\django\core\management\__init__.py", line 364, in execute_from_command_line
utility.execute()
File "C:\Python36\lib\site-packages\django\core\management\__init__.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python36\lib\site-packages\django\core\management\base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Python36\lib\site-packages\django\core\management\base.py", line 330, in execute
output = self.handle(*args, **options)
File "applicationFile.py", line 32, in handle
for i, event in enumerate(events):
File "C:\Python36\lib\site-packages\django\db\models\query.py", line 250, in __iter__
self._fetch_all()
File "C:\Python36\lib\site-packages\django\db\models\query.py", line 1118, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "C:\Python36\lib\site-packages\django\db\models\query.py", line 53, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
File "C:\Python36\lib\site-packages\django\db\models\sql\compiler.py", line 894, in execute_sql
raise original_exception
File "C:\Python36\lib\site-packages\django\db\models\sql\compiler.py", line 884, in execute_sql
cursor.execute(sql, params)
File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 80, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Python36\lib\site-packages\django\db\utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Python36\lib\site-packages\django\utils\six.py", line 685, in reraise
raise value.with_traceback(tb)
File "C:\Python36\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Python36\lib\site-packages\django\db\backends\mysql\base.py", line 101, in execute
return self.cursor.execute(query, args)
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "C:\Python36\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 247, in execute
res = self._query(query)
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "C:\Python36\lib\site-packages\MySQLdb\cursors.py", line 374, in _do_query
db.query(q)
File "C:\Python36\lib\site-packages\MySQLdb\connections.py", line 277, in query
_mysql.connection.query(self, query)
django.db.utils.OperationalError: (2013, 'Lost connection to MySQL server during query')
MySQL log
2018-01-26T13:46:04.518560Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 4844ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
2018-01-26T23:09:13.208203Z 451 [Note] Aborted connection 451 to db: 'mydb' user: 'user' host: 'localhost' (Got timeout reading communication packets)
2018-01-27T07:08:00.507190Z 449 [Note] Aborted connection 449 to db: 'mydb' user: 'user' host: 'localhost' (Got timeout reading communication packets)
更新
我尝试更改mysql的数据包大小
my.ini
max_allowed_packet的= 40M
使连接超时无限制。
我尝试添加
'CONN_MAX_AGE': None
到数据库配置。我会在几天内看到它是如何工作的。
更新
mysql> SHOW GLOBAL VARIABLES LIKE "%vers%";
+-------------------------+------------------------------+
| Variable_name | Value |
+-------------------------+------------------------------+
| innodb_version | 5.7.20 |
| protocol_version | 10 |
| slave_type_conversions | |
| tls_version | TLSv1,TLSv1.1 |
| version | 5.7.20-log |
| version_comment | MySQL Community Server (GPL) |
| version_compile_machine | x86_64 |
| version_compile_os | Win64 |
+-------------------------+------------------------------+
8 rows in set (0.19 sec)
mysql> SHOW GLOBAL VARIABLES LIKE "%connect%";
+-----------------------------------------------+-----------------+
| Variable_name | Value |
+-----------------------------------------------+-----------------+
| character_set_connection | utf8 |
| collation_connection | utf8_general_ci |
| connect_timeout | 10 |
| disconnect_on_expired_password | ON |
| init_connect | |
| max_connect_errors | 100 |
| max_connections | 151 |
| max_user_connections | 0 |
| performance_schema_session_connect_attrs_size | 512 |
+-----------------------------------------------+-----------------+
9 rows in set (0.00 sec)
mysql> SHOW GLOBAL STATUS LIKE "%connect%";
+-----------------------------------------------+---------------------+
| Variable_name | Value |
+-----------------------------------------------+---------------------+
| Aborted_connects | 1 |
| Connection_errors_accept | 0 |
| Connection_errors_internal | 0 |
| Connection_errors_max_connections | 0 |
| Connection_errors_peer_address | 0 |
| Connection_errors_select | 0 |
| Connection_errors_tcpwrap | 0 |
| Connections | 27 |
| Locked_connects | 0 |
| Max_used_connections | 3 |
| Max_used_connections_time | 2018-03-07 14:10:15 |
| Performance_schema_session_connect_attrs_lost | 0 |
| Ssl_client_connects | 0 |
| Ssl_connect_renegotiates | 0 |
| Ssl_finished_connects | 0 |
| Threads_connected | 3 |
+-----------------------------------------------+---------------------+
16 rows in set (0.09 sec)
mysql> SHOW GLOBAL VARIABLES LIKE "%clean%";
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| innodb_page_cleaners | 1 |
+----------------------+-------+
1 row in set (0.00 sec)
mysql> SHOW GLOBAL VARIABLES LIKE "%max%";
+------------------------------------------------------+----------------------+
| Variable_name | Value |
+------------------------------------------------------+----------------------+
| binlog_max_flush_queue_time | 0 |
| ft_max_word_len | 84 |
| group_concat_max_len | 1024 |
| innodb_adaptive_max_sleep_delay | 150000 |
| innodb_change_buffer_max_size | 25 |
| innodb_compression_pad_pct_max | 50 |
| innodb_file_format_max | Barracuda |
| innodb_ft_max_token_size | 84 |
| innodb_io_capacity_max | 2000 |
| innodb_max_dirty_pages_pct | 75.000000 |
| innodb_max_dirty_pages_pct_lwm | 0.000000 |
| innodb_max_purge_lag | 0 |
| innodb_max_purge_lag_delay | 0 |
| innodb_max_undo_log_size | 1073741824 |
| innodb_online_alter_log_max_size | 134217728 |
| max_allowed_packet | 41943040 |
| max_binlog_cache_size | 18446744073709547520 |
| max_binlog_size | 1073741824 |
| max_binlog_stmt_cache_size | 18446744073709547520 |
| max_connect_errors | 100 |
| max_connections | 151 |
| max_delayed_threads | 20 |
| max_digest_length | 1024 |
| max_error_count | 64 |
| max_execution_time | 0 |
| max_heap_table_size | 16777216 |
| max_insert_delayed_threads | 20 |
| max_join_size | 18446744073709551615 |
| max_length_for_sort_data | 1024 |
| max_points_in_geometry | 65536 |
| max_prepared_stmt_count | 16382 |
| max_relay_log_size | 0 |
| max_seeks_for_key | 4294967295 |
| max_sort_length | 1024 |
| max_sp_recursion_depth | 0 |
| max_tmp_tables | 32 |
| max_user_connections | 0 |
| max_write_lock_count | 4294967295 |
| myisam_max_sort_file_size | 107374182400 |
| optimizer_trace_max_mem_size | 16384 |
| parser_max_mem_size | 18446744073709551615 |
| performance_schema_max_cond_classes | 80 |
| performance_schema_max_cond_instances | -1 |
| performance_schema_max_digest_length | 1024 |
| performance_schema_max_file_classes | 80 |
| performance_schema_max_file_handles | 32768 |
| performance_schema_max_file_instances | -1 |
| performance_schema_max_index_stat | -1 |
| performance_schema_max_memory_classes | 320 |
| performance_schema_max_metadata_locks | -1 |
| performance_schema_max_mutex_classes | 210 |
| performance_schema_max_mutex_instances | -1 |
| performance_schema_max_prepared_statements_instances | -1 |
| performance_schema_max_program_instances | -1 |
| performance_schema_max_rwlock_classes | 40 |
| performance_schema_max_rwlock_instances | -1 |
| performance_schema_max_socket_classes | 10 |
| performance_schema_max_socket_instances | -1 |
| performance_schema_max_sql_text_length | 1024 |
| performance_schema_max_stage_classes | 150 |
| performance_schema_max_statement_classes | 193 |
| performance_schema_max_statement_stack | 10 |
| performance_schema_max_table_handles | -1 |
| performance_schema_max_table_instances | -1 |
| performance_schema_max_table_lock_stat | -1 |
| performance_schema_max_thread_classes | 50 |
| performance_schema_max_thread_instances | -1 |
| range_optimizer_max_mem_size | 8388608 |
| slave_max_allowed_packet | 1073741824 |
| slave_pending_jobs_size_max | 16777216 |
+------------------------------------------------------+----------------------+
70 rows in set (0.00 sec)
mysql> SHOW GLOBAL VARIABLES LIKE "%thread%";
+-----------------------------------------+---------------------------+
| Variable_name | Value |
+-----------------------------------------+---------------------------+
| innodb_purge_threads | 4 |
| innodb_read_io_threads | 4 |
| innodb_thread_concurrency | 9 |
| innodb_thread_sleep_delay | 0 |
| innodb_write_io_threads | 4 |
| max_delayed_threads | 20 |
| max_insert_delayed_threads | 20 |
| myisam_repair_threads | 1 |
| performance_schema_max_thread_classes | 50 |
| performance_schema_max_thread_instances | -1 |
| thread_cache_size | 10 |
| thread_handling | one-thread-per-connection |
| thread_stack | 262144 |
+-----------------------------------------+---------------------------+
13 rows in set (0.00 sec)
mysql> SHOW GLOBAL STATUS LIKE "%thread%";
+------------------------------------------+-------+
| Variable_name | Value |
+------------------------------------------+-------+
| Delayed_insert_threads | 0 |
| Performance_schema_thread_classes_lost | 0 |
| Performance_schema_thread_instances_lost | 0 |
| Slow_launch_threads | 0 |
| Threads_cached | 0 |
| Threads_connected | 3 |
| Threads_created | 3 |
| Threads_running | 1 |
+------------------------------------------+-------+
8 rows in set (0.00 sec)