Azure 队列触发函数错误

Question

当 Azure Queue 触发函数失败时，消息何时可以在队列中重试？

是吗：

• 可见性超时后

或

• 立即失败

失败 = 函数抛出 Exception。

Answer 1

我找不到文档，所以可以在这个 repo https://github.com/Azure/azure-webjobs-sdk 中询问它

但查看代码 here 应该可以回答您的问题

    /// <summary>
    /// This method completes processing of the specified message, after the job function has been invoked.
    /// </summary>
    /// <remarks>
    /// If the message was processed successfully, the message should be deleted. If message processing failed, the
    /// message should be release back to the queue, or if the maximum dequeue count has been exceeded, the message
    /// should be moved to the poison queue (if poison queue handling is configured for the queue).
    /// </remarks>
    /// <param name="message">The message to complete processing for.</param>
    /// <param name="result">The <see cref="FunctionResult"/> from the job invocation.</param>
    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to use</param>
    /// <returns></returns>
    public virtual async Task CompleteProcessingMessageAsync(CloudQueueMessage message, FunctionResult result, CancellationToken cancellationToken)
    {
        if (result.Succeeded)
        {
            await DeleteMessageAsync(message, cancellationToken);
        }
        else if (_poisonQueue != null)
        {
            if (message.DequeueCount >= MaxDequeueCount)
            {
                // These values may change if the message is inserted into another queue. We'll store them here and make sure
                // the message always has the original values before we pass it to a customer-facing method.
                string id = message.Id;
                string popReceipt = message.PopReceipt;

                await CopyMessageToPoisonQueueAsync(message, _poisonQueue, cancellationToken);

                // TEMP: Re-evaluate these property updates when we update Storage SDK: https://github.com/Azure/azure-webjobs-sdk/issues/1144
                message.UpdateChangedProperties(id, popReceipt);

                await DeleteMessageAsync(message, cancellationToken);
            }
            else
            {
                await ReleaseMessageAsync(message, result, VisibilityTimeout, cancellationToken);
            }
        }
        else
        {
            // For queues without a corresponding poison queue, leave the message invisible when processing
            // fails to prevent a fast infinite loop.
            // Specifically, don't call ReleaseMessage(message)
        }

}

Answer 2

它会立即再次被拾取。我运行了一个示例失败的队列触发函数，它在几秒钟内被触发了 5 次。尝试 5 次后，该项目已移至 xyz-poison 队列。