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我有两个简单的周期性 celery 任务，它们在晚上运行，一个在凌晨 2 点运行，另一个在凌晨 3 点运行，并且有时会抛出关于djcelery_periodictask我不太了解的桌子上的死锁的异常。似乎一个任务试图更新djcelery_periodictask，而另一个任务仍然持有共享锁：

deadlock detected Detail: Process 32353 waits for ShareLock on transaction 39280165; blocked by process 32306. Process 32306 waits for ShareLock on transaction 39280166; blocked by process 32353. 
Process 32353: 
UPDATE "djcelery_periodictask" SET "name" = 'app.tasks.task1', "task" = 'app.tasks.task1', "interval_id" = NULL, "crontab_id" = 4, "args" = '[]', "kwargs" = '{}', "queue" = NULL, "exchange" = NULL, "routing_key" = NULL, "expires" = NULL, "enabled" = true, "last_run_at" = '2015-02-10 03:00:00.001297+01:00', "total_run_count" = 117, "date_changed" = '2015-02-10 02:00:00.010033+00:00', "description" = '' WHERE "djcelery_periodictask"."id" = 4 
Process 32306: 
UPDATE "djcelery_periodictask" SET "name" = 'app.tasks.task2', "task" = 'app.tasks.task2', "interval_id" = NULL, "crontab_id" = 6, "args" = '[]', "kwargs" = '{}', "queue" = NULL, "exchange" = NULL, "routing_key" = NULL, "expires" = NULL, "enabled" = true, "last_run_at" = '2015-02-10 02:00:00.014189+01:00', "total_run_count" = 63, "date_changed" = '2015-02-10 02:00:00.015097+00:00', "description" = '' WHERE "djcelery_periodictask"."id" = 6 
Hint: See server log for query details. Query: 
UPDATE "djcelery_periodictask" SET "name" = 'app.tasks.task2', "task" = 'appt.tasks.task2', "interval_id" = NULL, "crontab_id" = 4, "args" = '[]', "kwargs" = '{}', "queue" = NULL, "exchange" = NULL, "routing_key" = NULL, "expires" = NULL, "enabled" = true, "last_run_at"

对仅包含几行的表的两个简单更新怎么会陷入死锁？

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1 回答 1

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我的问题是我的所有工作人员都从参数开始，-B该参数使每个工作人员都进入了定期任务调度程序：

-B, --beat            Also run the celery beat periodic task scheduler.
                      Please note that there must only be one instance of
                      this service.

结果，计划任务在同一时间启动了多次，在尝试更新djcelery_periodictask表时产生了死锁。

于 2015-02-13T09:13:02.207 回答