Azure 函数 host.json：maxPollingInterval
Azure Functions host.json: maxPollingInterval
如果我阅读了 maxPollingInterval 的文档：
The maximum interval between queue polls
我在 host.json 中将其设置为 00:01:00。我的理解是我已经告诉函数运行时它可能不会每 2 分钟进行一次轮询。它必须每分钟做一次 atleast，但是如果它正在读取的队列是 "hot"，也就是说，有一致的消息流，它就会做比我指定的那一分钟更频繁。如果消息流下降，则运行时将开始减少检查频率，直到达到一分钟。
这个理解正确吗？
我试图在 webjob sdk 中找到这种池化机制的代码：https://github.com/Azure/azure-webjobs-sdk and Azure Functions runtime: https://github.com/Azure/Azure-Functions，但我不知道要注意什么（而且我还没有花那么多时间在这上面).
queuetrigger 实现随机指数退避算法。因此，如果队列中没有消息，SDK 将退出并降低轮询频率。
MaxPollingInterval 允许您配置此行为。它用于当队列保持为空时，在检查消息之前等待的最长时间。
例如，如果将其设置为00:01:00，然后将消息发送到队列。函数将被触发然后等待2秒检查，如果没有消息，等待4秒，没有消息，等待8秒等。如果您将消息发送到队列并触发该功能，它将依次等待 2 秒、4 秒、8 秒、...、1 分钟、1 分钟、1 分钟 ...直到队列触发接收消息。
这是Offical doc，下面是我做的测试。大家可以看看我测试的时间间隔，自己试一下。
2019-10-15T07:53:32.884 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=aead524a-cdba-4e43-a956-1a8558dea037)
2019-10-15T07:53:32.884 [Information] Trigger Details: MessageId: e8e9fa50-cda3-4653-bddb-c446807ec986, DequeueCount: 1, InsertionTime: 10/15/2019 7:53:32 AM +00:00
2019-10-15T07:53:32.886 [Information] C# Queue trigger function processed: 1
2019-10-15T07:53:32.886 [Information] Executed 'Function1' (Succeeded, Id=aead524a-cdba-4e43-a956-1a8558dea037)
2019-10-15T07:56:27.105 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=eb01dce6-23fd-4128-bccd-8c26c104361f)
2019-10-15T07:56:27.105 [Information] Trigger Details: MessageId: 9aa0a4ff-d823-4703-a8b4-dca0ff7b61cb, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:54 AM +00:00
2019-10-15T07:56:27.106 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=d5b92a82-5159-4c28-91b0-c84668916f13)
2019-10-15T07:56:27.106 [Information] Trigger Details: MessageId: b9445cc1-8d0e-4f37-9de2-aafd74df4b82, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:55 AM +00:00
2019-10-15T07:56:27.106 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=86d6abb4-9a41-4bac-9259-17d85afd031f)
2019-10-15T07:56:27.106 [Information] Trigger Details: MessageId: f019251e-6d79-448c-baba-13bfd8401494, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:57 AM +00:00
2019-10-15T07:56:27.106 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=01d94b5c-230d-4ae0-adb6-70a949ec97b5)
2019-10-15T07:56:27.106 [Information] Trigger Details: MessageId: a00e1340-e0f7-4aee-a4a7-addb9a210831, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:58 AM +00:00
2019-10-15T07:56:27.107 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=fd928cf3-c0a7-4fa1-88a1-e31eecf069bd)
2019-10-15T07:56:27.107 [Information] Trigger Details: MessageId: 6a8cc1b9-c45c-42e2-b7bf-34f7e96f5471, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:01 AM +00:00
2019-10-15T07:56:27.107 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=8e6de5fc-6696-4030-a2cc-748b5da44ec7)
2019-10-15T07:56:27.107 [Information] Trigger Details: MessageId: 0b100915-7de1-44b9-a706-2fd866169563, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:02 AM +00:00
2019-10-15T07:56:27.107 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=9f1a6e13-93e7-443c-a021-c0b9d5f4dcfa)
2019-10-15T07:56:27.108 [Information] Trigger Details: MessageId: 713159e1-99cd-4727-9793-7540297eb6d0, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:04 AM +00:00
2019-10-15T07:56:27.108 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=564ca50f-58a7-4475-865d-03706298c5fd)
2019-10-15T07:56:27.108 [Information] Trigger Details: MessageId: c9bc6646-15c4-42b8-ac48-44deeb056844, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:06 AM +00:00
2019-10-15T07:56:27.113 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=2d5083ee-e839-4bd1-a59d-3f13a7f04ae2)
2019-10-15T07:56:27.114 [Information] Trigger Details: MessageId: 4a92ad18-3e53-443d-a721-1e84ae77c112, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:08 AM +00:00
2019-10-15T07:56:27.114 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=b512c3bf-2d80-4e6c-ac6d-fef77f2c93ef)
2019-10-15T07:56:27.114 [Information] Trigger Details: MessageId: 5eace6a2-98e4-4aca-8747-ff2a2d9c5198, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:10 AM +00:00
2019-10-15T07:56:27.114 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=0febda35-e777-4449-b8dd-a0895daa403e)
2019-10-15T07:56:27.114 [Information] Trigger Details: MessageId: 5e7b9f35-afa7-4edd-bb8a-cb98c12c25f5, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:12 AM +00:00
2019-10-15T07:56:27.115 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=78e66fcb-45a5-4612-8dde-ff2c31be1585)
2019-10-15T07:56:27.115 [Information] Trigger Details: MessageId: 623a077d-4bfb-4321-b6c0-2ef475ad11f4, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:15 AM +00:00
2019-10-15T07:56:27.115 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=01afae82-451e-42a7-9ed8-346737efdd01)
2019-10-15T07:56:27.115 [Information] Trigger Details: MessageId: 243a1af2-238d-48b3-930f-0ba629aeb293, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:17 AM +00:00
2019-10-15T07:56:27.115 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=b6aa18b7-d52c-4b33-83ec-d380a5431de8)
2019-10-15T07:56:27.115 [Information] Trigger Details: MessageId: 71c5d964-215a-4a62-a12c-b0d2c2a15756, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:20 AM +00:00
2019-10-15T07:56:27.116 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=3d1c2ed3-d79e-4492-8ce2-3f6980bef396)
2019-10-15T07:56:27.116 [Information] Trigger Details: MessageId: 23121a01-ef82-4339-8df3-0d4fed9f0cab, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:23 AM +00:00
2019-10-15T07:56:27.116 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=72e3bd65-4c14-4b21-ad1a-9055ec0c7491)
2019-10-15T07:56:27.116 [Information] Trigger Details: MessageId: df15e792-fecb-45c9-91d3-73d493faea4f, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:24 AM +00:00
2019-10-15T07:56:27.123 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.123 [Information] Executed 'Function1' (Succeeded, Id=eb01dce6-23fd-4128-bccd-8c26c104361f)
2019-10-15T07:56:27.123 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.124 [Information] Executed 'Function1' (Succeeded, Id=d5b92a82-5159-4c28-91b0-c84668916f13)
2019-10-15T07:56:27.124 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.124 [Information] Executed 'Function1' (Succeeded, Id=86d6abb4-9a41-4bac-9259-17d85afd031f)
2019-10-15T07:56:27.126 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.126 [Information] Executed 'Function1' (Succeeded, Id=01d94b5c-230d-4ae0-adb6-70a949ec97b5)
2019-10-15T07:56:27.132 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.132 [Information] Executed 'Function1' (Succeeded, Id=fd928cf3-c0a7-4fa1-88a1-e31eecf069bd)
2019-10-15T07:56:27.133 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.133 [Information] Executed 'Function1' (Succeeded, Id=8e6de5fc-6696-4030-a2cc-748b5da44ec7)
2019-10-15T07:56:27.134 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.134 [Information] Executed 'Function1' (Succeeded, Id=9f1a6e13-93e7-443c-a021-c0b9d5f4dcfa)
2019-10-15T07:56:27.135 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.135 [Information] Executed 'Function1' (Succeeded, Id=564ca50f-58a7-4475-865d-03706298c5fd)
2019-10-15T07:56:27.142 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.142 [Information] Executed 'Function1' (Succeeded, Id=2d5083ee-e839-4bd1-a59d-3f13a7f04ae2)
2019-10-15T07:56:27.143 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.143 [Information] Executed 'Function1' (Succeeded, Id=b512c3bf-2d80-4e6c-ac6d-fef77f2c93ef)
2019-10-15T07:56:27.144 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.144 [Information] Executed 'Function1' (Succeeded, Id=0febda35-e777-4449-b8dd-a0895daa403e)
2019-10-15T07:56:27.150 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.150 [Information] Executed 'Function1' (Succeeded, Id=78e66fcb-45a5-4612-8dde-ff2c31be1585)
2019-10-15T07:56:27.152 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.152 [Information] Executed 'Function1' (Succeeded, Id=01afae82-451e-42a7-9ed8-346737efdd01)
2019-10-15T07:56:27.153 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.153 [Information] Executed 'Function1' (Succeeded, Id=b6aa18b7-d52c-4b33-83ec-d380a5431de8)
2019-10-15T07:56:27.159 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.160 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.160 [Information] Executed 'Function1' (Succeeded, Id=72e3bd65-4c14-4b21-ad1a-9055ec0c7491)
2019-10-15T07:56:27.161 [Information] Executed 'Function1' (Succeeded, Id=3d1c2ed3-d79e-4492-8ce2-3f6980bef396)
2019-10-15T07:57:25.420 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=a0ba0110-b590-4770-856b-dcd0b9b2fe7e)
2019-10-15T07:57:25.420 [Information] Trigger Details: MessageId: 5203a3c7-30c6-41f3-95af-dafac74512c8, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:21 AM +00:00
2019-10-15T07:57:25.420 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=cb9f04e9-931d-4e09-89b5-0f346043c637)
2019-10-15T07:57:25.421 [Information] Trigger Details: MessageId: 2210c791-0f56-4eae-809d-2060591a5a9b, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:23 AM +00:00
2019-10-15T07:57:25.421 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=0be83ef6-6872-4ed1-bea9-a89ade1aa031)
2019-10-15T07:57:25.421 [Information] Trigger Details: MessageId: 8ec52c1d-584a-4c95-ae74-93beca0ea8dc, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:25 AM +00:00
2019-10-15T07:57:25.422 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:25.422 [Information] Executed 'Function1' (Succeeded, Id=a0ba0110-b590-4770-856b-dcd0b9b2fe7e)
2019-10-15T07:57:25.423 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:25.423 [Information] Executed 'Function1' (Succeeded, Id=cb9f04e9-931d-4e09-89b5-0f346043c637)
2019-10-15T07:57:25.429 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:25.429 [Information] Executed 'Function1' (Succeeded, Id=0be83ef6-6872-4ed1-bea9-a89ade1aa031)
2019-10-15T07:57:27.424 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=14583d91-ec35-42aa-83c8-0727388b663d)
2019-10-15T07:57:27.424 [Information] Trigger Details: MessageId: 0c55402f-b47b-476e-ae5c-f64d9756b65f, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:26 AM +00:00
2019-10-15T07:57:27.425 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:27.425 [Information] Executed 'Function1' (Succeeded, Id=14583d91-ec35-42aa-83c8-0727388b663d)
现在明白了吗？
@BowmanZhu，就complete/update你的回答，好像是Microsoft.Azure.WebJobs版本3.0.16，轮询的触发方式不同。
检查机制是从QueuePollingIntervals.Minimum（不是2秒）开始，也就是100ms，然后按指数递增，直到达到最大值。
注意： 对于开发环境，MaxPollingInterval 默认值不是 1 分钟，而是 2 秒。
MaxPollingInterval 设置为 15 秒（15 000 毫秒）：
dbug: Microsoft.Extensions.Hosting.Internal.Host[2]
Hosting started
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 100 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 199 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 336 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 548 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 916 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 1851 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 3199 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 6222 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 13030 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 15000 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 15000 ms before polling queue 'Whosebug'.
...
如果我阅读了 maxPollingInterval 的文档：
The maximum interval between queue polls
我在 host.json 中将其设置为 00:01:00。我的理解是我已经告诉函数运行时它可能不会每 2 分钟进行一次轮询。它必须每分钟做一次 atleast，但是如果它正在读取的队列是 "hot"，也就是说，有一致的消息流，它就会做比我指定的那一分钟更频繁。如果消息流下降，则运行时将开始减少检查频率，直到达到一分钟。
这个理解正确吗？
我试图在 webjob sdk 中找到这种池化机制的代码：https://github.com/Azure/azure-webjobs-sdk and Azure Functions runtime: https://github.com/Azure/Azure-Functions，但我不知道要注意什么（而且我还没有花那么多时间在这上面).
queuetrigger 实现随机指数退避算法。因此，如果队列中没有消息，SDK 将退出并降低轮询频率。
MaxPollingInterval 允许您配置此行为。它用于当队列保持为空时，在检查消息之前等待的最长时间。
例如，如果将其设置为00:01:00，然后将消息发送到队列。函数将被触发然后等待2秒检查，如果没有消息，等待4秒，没有消息，等待8秒等。如果您将消息发送到队列并触发该功能，它将依次等待 2 秒、4 秒、8 秒、...、1 分钟、1 分钟、1 分钟 ...直到队列触发接收消息。
这是Offical doc，下面是我做的测试。大家可以看看我测试的时间间隔，自己试一下。
2019-10-15T07:53:32.884 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=aead524a-cdba-4e43-a956-1a8558dea037)
2019-10-15T07:53:32.884 [Information] Trigger Details: MessageId: e8e9fa50-cda3-4653-bddb-c446807ec986, DequeueCount: 1, InsertionTime: 10/15/2019 7:53:32 AM +00:00
2019-10-15T07:53:32.886 [Information] C# Queue trigger function processed: 1
2019-10-15T07:53:32.886 [Information] Executed 'Function1' (Succeeded, Id=aead524a-cdba-4e43-a956-1a8558dea037)
2019-10-15T07:56:27.105 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=eb01dce6-23fd-4128-bccd-8c26c104361f)
2019-10-15T07:56:27.105 [Information] Trigger Details: MessageId: 9aa0a4ff-d823-4703-a8b4-dca0ff7b61cb, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:54 AM +00:00
2019-10-15T07:56:27.106 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=d5b92a82-5159-4c28-91b0-c84668916f13)
2019-10-15T07:56:27.106 [Information] Trigger Details: MessageId: b9445cc1-8d0e-4f37-9de2-aafd74df4b82, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:55 AM +00:00
2019-10-15T07:56:27.106 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=86d6abb4-9a41-4bac-9259-17d85afd031f)
2019-10-15T07:56:27.106 [Information] Trigger Details: MessageId: f019251e-6d79-448c-baba-13bfd8401494, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:57 AM +00:00
2019-10-15T07:56:27.106 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=01d94b5c-230d-4ae0-adb6-70a949ec97b5)
2019-10-15T07:56:27.106 [Information] Trigger Details: MessageId: a00e1340-e0f7-4aee-a4a7-addb9a210831, DequeueCount: 1, InsertionTime: 10/15/2019 7:55:58 AM +00:00
2019-10-15T07:56:27.107 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=fd928cf3-c0a7-4fa1-88a1-e31eecf069bd)
2019-10-15T07:56:27.107 [Information] Trigger Details: MessageId: 6a8cc1b9-c45c-42e2-b7bf-34f7e96f5471, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:01 AM +00:00
2019-10-15T07:56:27.107 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=8e6de5fc-6696-4030-a2cc-748b5da44ec7)
2019-10-15T07:56:27.107 [Information] Trigger Details: MessageId: 0b100915-7de1-44b9-a706-2fd866169563, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:02 AM +00:00
2019-10-15T07:56:27.107 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=9f1a6e13-93e7-443c-a021-c0b9d5f4dcfa)
2019-10-15T07:56:27.108 [Information] Trigger Details: MessageId: 713159e1-99cd-4727-9793-7540297eb6d0, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:04 AM +00:00
2019-10-15T07:56:27.108 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=564ca50f-58a7-4475-865d-03706298c5fd)
2019-10-15T07:56:27.108 [Information] Trigger Details: MessageId: c9bc6646-15c4-42b8-ac48-44deeb056844, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:06 AM +00:00
2019-10-15T07:56:27.113 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=2d5083ee-e839-4bd1-a59d-3f13a7f04ae2)
2019-10-15T07:56:27.114 [Information] Trigger Details: MessageId: 4a92ad18-3e53-443d-a721-1e84ae77c112, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:08 AM +00:00
2019-10-15T07:56:27.114 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=b512c3bf-2d80-4e6c-ac6d-fef77f2c93ef)
2019-10-15T07:56:27.114 [Information] Trigger Details: MessageId: 5eace6a2-98e4-4aca-8747-ff2a2d9c5198, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:10 AM +00:00
2019-10-15T07:56:27.114 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=0febda35-e777-4449-b8dd-a0895daa403e)
2019-10-15T07:56:27.114 [Information] Trigger Details: MessageId: 5e7b9f35-afa7-4edd-bb8a-cb98c12c25f5, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:12 AM +00:00
2019-10-15T07:56:27.115 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=78e66fcb-45a5-4612-8dde-ff2c31be1585)
2019-10-15T07:56:27.115 [Information] Trigger Details: MessageId: 623a077d-4bfb-4321-b6c0-2ef475ad11f4, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:15 AM +00:00
2019-10-15T07:56:27.115 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=01afae82-451e-42a7-9ed8-346737efdd01)
2019-10-15T07:56:27.115 [Information] Trigger Details: MessageId: 243a1af2-238d-48b3-930f-0ba629aeb293, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:17 AM +00:00
2019-10-15T07:56:27.115 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=b6aa18b7-d52c-4b33-83ec-d380a5431de8)
2019-10-15T07:56:27.115 [Information] Trigger Details: MessageId: 71c5d964-215a-4a62-a12c-b0d2c2a15756, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:20 AM +00:00
2019-10-15T07:56:27.116 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=3d1c2ed3-d79e-4492-8ce2-3f6980bef396)
2019-10-15T07:56:27.116 [Information] Trigger Details: MessageId: 23121a01-ef82-4339-8df3-0d4fed9f0cab, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:23 AM +00:00
2019-10-15T07:56:27.116 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=72e3bd65-4c14-4b21-ad1a-9055ec0c7491)
2019-10-15T07:56:27.116 [Information] Trigger Details: MessageId: df15e792-fecb-45c9-91d3-73d493faea4f, DequeueCount: 1, InsertionTime: 10/15/2019 7:56:24 AM +00:00
2019-10-15T07:56:27.123 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.123 [Information] Executed 'Function1' (Succeeded, Id=eb01dce6-23fd-4128-bccd-8c26c104361f)
2019-10-15T07:56:27.123 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.124 [Information] Executed 'Function1' (Succeeded, Id=d5b92a82-5159-4c28-91b0-c84668916f13)
2019-10-15T07:56:27.124 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.124 [Information] Executed 'Function1' (Succeeded, Id=86d6abb4-9a41-4bac-9259-17d85afd031f)
2019-10-15T07:56:27.126 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.126 [Information] Executed 'Function1' (Succeeded, Id=01d94b5c-230d-4ae0-adb6-70a949ec97b5)
2019-10-15T07:56:27.132 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.132 [Information] Executed 'Function1' (Succeeded, Id=fd928cf3-c0a7-4fa1-88a1-e31eecf069bd)
2019-10-15T07:56:27.133 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.133 [Information] Executed 'Function1' (Succeeded, Id=8e6de5fc-6696-4030-a2cc-748b5da44ec7)
2019-10-15T07:56:27.134 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.134 [Information] Executed 'Function1' (Succeeded, Id=9f1a6e13-93e7-443c-a021-c0b9d5f4dcfa)
2019-10-15T07:56:27.135 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.135 [Information] Executed 'Function1' (Succeeded, Id=564ca50f-58a7-4475-865d-03706298c5fd)
2019-10-15T07:56:27.142 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.142 [Information] Executed 'Function1' (Succeeded, Id=2d5083ee-e839-4bd1-a59d-3f13a7f04ae2)
2019-10-15T07:56:27.143 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.143 [Information] Executed 'Function1' (Succeeded, Id=b512c3bf-2d80-4e6c-ac6d-fef77f2c93ef)
2019-10-15T07:56:27.144 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.144 [Information] Executed 'Function1' (Succeeded, Id=0febda35-e777-4449-b8dd-a0895daa403e)
2019-10-15T07:56:27.150 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.150 [Information] Executed 'Function1' (Succeeded, Id=78e66fcb-45a5-4612-8dde-ff2c31be1585)
2019-10-15T07:56:27.152 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.152 [Information] Executed 'Function1' (Succeeded, Id=01afae82-451e-42a7-9ed8-346737efdd01)
2019-10-15T07:56:27.153 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.153 [Information] Executed 'Function1' (Succeeded, Id=b6aa18b7-d52c-4b33-83ec-d380a5431de8)
2019-10-15T07:56:27.159 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.160 [Information] C# Queue trigger function processed: 1
2019-10-15T07:56:27.160 [Information] Executed 'Function1' (Succeeded, Id=72e3bd65-4c14-4b21-ad1a-9055ec0c7491)
2019-10-15T07:56:27.161 [Information] Executed 'Function1' (Succeeded, Id=3d1c2ed3-d79e-4492-8ce2-3f6980bef396)
2019-10-15T07:57:25.420 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=a0ba0110-b590-4770-856b-dcd0b9b2fe7e)
2019-10-15T07:57:25.420 [Information] Trigger Details: MessageId: 5203a3c7-30c6-41f3-95af-dafac74512c8, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:21 AM +00:00
2019-10-15T07:57:25.420 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=cb9f04e9-931d-4e09-89b5-0f346043c637)
2019-10-15T07:57:25.421 [Information] Trigger Details: MessageId: 2210c791-0f56-4eae-809d-2060591a5a9b, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:23 AM +00:00
2019-10-15T07:57:25.421 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=0be83ef6-6872-4ed1-bea9-a89ade1aa031)
2019-10-15T07:57:25.421 [Information] Trigger Details: MessageId: 8ec52c1d-584a-4c95-ae74-93beca0ea8dc, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:25 AM +00:00
2019-10-15T07:57:25.422 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:25.422 [Information] Executed 'Function1' (Succeeded, Id=a0ba0110-b590-4770-856b-dcd0b9b2fe7e)
2019-10-15T07:57:25.423 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:25.423 [Information] Executed 'Function1' (Succeeded, Id=cb9f04e9-931d-4e09-89b5-0f346043c637)
2019-10-15T07:57:25.429 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:25.429 [Information] Executed 'Function1' (Succeeded, Id=0be83ef6-6872-4ed1-bea9-a89ade1aa031)
2019-10-15T07:57:27.424 [Information] Executing 'Function1' (Reason='New queue message detected on 'myqueue-items'.', Id=14583d91-ec35-42aa-83c8-0727388b663d)
2019-10-15T07:57:27.424 [Information] Trigger Details: MessageId: 0c55402f-b47b-476e-ae5c-f64d9756b65f, DequeueCount: 1, InsertionTime: 10/15/2019 7:57:26 AM +00:00
2019-10-15T07:57:27.425 [Information] C# Queue trigger function processed: 1
2019-10-15T07:57:27.425 [Information] Executed 'Function1' (Succeeded, Id=14583d91-ec35-42aa-83c8-0727388b663d)
现在明白了吗？
@BowmanZhu，就complete/update你的回答，好像是Microsoft.Azure.WebJobs版本3.0.16，轮询的触发方式不同。 检查机制是从QueuePollingIntervals.Minimum（不是2秒）开始，也就是100ms，然后按指数递增，直到达到最大值。
注意： 对于开发环境，MaxPollingInterval 默认值不是 1 分钟，而是 2 秒。
MaxPollingInterval 设置为 15 秒（15 000 毫秒）：
dbug: Microsoft.Extensions.Hosting.Internal.Host[2]
Hosting started
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 100 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 199 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 336 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 548 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 916 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 1851 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 3199 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 6222 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 13030 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 15000 ms before polling queue 'Whosebug'.
dbug: Microsoft.Azure.WebJobs.Host.Queues.Listeners.QueueListener[2]
Function 'ProcessQueueMessage' will wait 15000 ms before polling queue 'Whosebug'.
...