在librdkafka中，每次在调用generate()之后调用dr_cb() [英] In librdkafka, dr_cb() is called each time after produce() called

问题描述

我正在使用C ++ Kafka客户端:librdkafka.该库位于 https://github.com/edenhill/librdkafka/blob/master/examples/rdkafka_example.cpp .每次调用Producer类中的 produce()时，是否会调用 dr_cb()函数(请参见以下代码)?

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

仅当应用程序在服务器上调用 poll()时，才会调用传递报告回调( dr_cb ).生产者句柄，不会在 produce()调用中调用它们.

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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