У нас есть служба, которая обрабатывает несколько дБ на том же отдельном сервере. Служба вышла из строя, но mysql не прервал все соединения и оставил их открытыми в течение очень долгого времени. Ниже находится журнал MySQL. На основании идентификатора соединения мы можем видеть, что соединение, указанное в последней строке, должно было прерваться вместе с остальными в 00:01, но оно зависало более 2 часов.
110216 0:00:01 [Warning] Aborted connection 11864307 to db: 'foodb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865442 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864559 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11863856 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865445 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864581 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865447 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864566 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865451 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865446 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865444 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864565 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865490 to db: 'foodb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864251 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864299 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864303 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865486 to db: 'foodb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864304 to db: 'foodb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864560 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11864268 to db: 'foodb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865055 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865443 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:01 [Warning] Aborted connection 11865450 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:02 [Warning] Aborted connection 11865448 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 0:00:02 [Warning] Aborted connection 11865485 to db: 'foodb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
110216 2:11:17 [Warning] Aborted connection 11865449 to db: 'bardb' user: 'db_user' host: '10.234.1.15' (Got an error reading communication packets)
Теперь, если предположить, что это проблема с mysql, учитывая приведенные ниже настройки тайм-аута, может ли это быть причиной чего-либо?
mysql> show variables like '%time%';
+----------------------------+-------------------+
| Variable_name | Value |
+----------------------------+-------------------+
| connect_timeout | 10 |
| datetime_format | %Y-%m-%d %H:%i:%s |
| delayed_insert_timeout | 300 |
| flush_time | 0 |
| innodb_lock_wait_timeout | 600 |
| innodb_rollback_on_timeout | OFF |
| interactive_timeout | 28800 |
| lc_time_names | en_US |
| long_query_time | 5 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| slow_launch_time | 2 |
| system_time_zone | GMT |
| table_lock_wait_timeout | 50 |
| time_format | %H:%i:%s |
| time_zone | SYSTEM |
| timed_mutexes | OFF |
| wait_timeout | 28800 |
+----------------------------+-------------------+
mysql> show variables like '%packet%';
+--------------------+----------+
| Variable_name | Value |
+--------------------+----------+
| max_allowed_packet | 16777216 |
+--------------------+----------+