在librdkafka中，每次调用produce()后都会调用dr_cb() [英] In librdkafka, dr_cb() is called each time after produce() called

问题描述

我正在开发 C++ Kafka 客户端:librdkafka.库在这里 https://github.com/edenhill/librdkafka/blob/master/examples/rdkafka_example.cpp.每次调用Producer类中的produce()，是否调用了dr_cb()函数(见下面代码)?

I am working on C++ Kafka client: librdkafka. The lib is here https://github.com/edenhill/librdkafka/blob/master/examples/rdkafka_example.cpp. Each time produce() in Producer class is called, is the dr_cb() function (see the following code) called?

/**
* Delivery Report callback class
*/
class DeliveryReportCb {
public:
virtual void dr_cb (Message &message) = 0;
};

推荐答案

交付报告回调 (dr_cb) 仅在应用程序调用 poll() 时调用生产者句柄，它们不是从 produce() 调用中调用的.

The delivery report callbacks (dr_cb) are only called when the application calls poll() on the Producer handle, they are not called from within the produce() call.

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