Question

Google App Engine具有强大的设置参数，可自动重试分布式任务队列中的失败任务。在documentation explains what these parameters do时，它无法指定默认参数。

Taskqueue的重试参数有哪些默认值。更具体地说，以下重试参数的默认值是什么：

<configSections> <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" /> </configSections>
task_retry_limit
task_age_limit
min_backoff_seconds
max_backoff_seconds

Answer 1

默认行为在this section的开头描述：

任务队列中执行的任务可能由于多种原因而失败。如果一个任务无法执行（通过返回任何HTTP状态代码范围200-299），App Engine重试任务直到成功。通过默认情况下，系统会逐渐降低重试率以避免泛滥您的应用程序请求太多，但计划重试尝试每小时最多重复一次，直到任务成功。

从这个描述中，通过观察没有重试配置的推送队列中的实际失败任务的日志（因此使用所有这些参数的默认值），我“导出”了这些值：

task_retry_limit：无
task_age_limit：无
min_backoff_seconds：0.1
max_backoff_seconds：3600
max_doublings：无

这些是我在开发服务器上看到的一些日志 - 我没有等待重试间隔安定下来，所以：

INFO     2015-09-02 12:50:54,670 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:50:54,670 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 0.100 seconds
INFO     2015-09-02 12:50:54,774 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:50:54,774 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 0.200 seconds
INFO     2015-09-02 12:50:54,983 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:50:54,983 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 0.400 seconds
INFO     2015-09-02 12:50:55,394 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:50:55,394 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 0.800 seconds
INFO     2015-09-02 12:50:56,206 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:50:56,206 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 1.600 seconds
INFO     2015-09-02 12:50:57,815 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:50:57,815 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 3.200 seconds
INFO     2015-09-02 12:51:01,058 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:51:01,058 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 6.400 seconds
INFO     2015-09-02 12:51:07,507 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:51:07,507 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 12.800 seconds
INFO     2015-09-02 12:51:20,346 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:51:20,346 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 25.600 seconds
INFO     2015-09-02 12:51:45,988 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:51:45,989 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 51.200 seconds
INFO     2015-09-02 12:52:37,224 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:52:37,225 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 102.400 seconds
INFO     2015-09-02 12:54:19,668 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:54:19,668 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 204.800 seconds
INFO     2015-09-02 12:57:44,508 module.py:808] my_module: "POST /my/task_q/path HTTP/1.1" 403 55
WARNING  2015-09-02 12:57:44,509 taskqueue_stub.py:1977] Task task2 failed to execute. This task will retry in 409.600 seconds

编辑：其实我找到了一个更好的答案，我曾经纠正过我（我以前错过了其他人之间的0.100s日志条目）：What are the defaults for a task queue in AppEngine?

App Engine：失败的任务队列的默认重试参数是什么

1 个答案: