Producer.send回調提供了一個消息對象。 message.offset()
通常在看起來是一個錯誤時返回0。confluent-python kafka生產者發送回調message.offset()返回0
這是用的: confluent-kafka python庫版本0.11.0 librdkafka:stable 0.11.0(瓶裝),HEAD。通過的Mac OS自制
下面簡單的測試程序安裝:
import confluent_kafka
import timeit
def delivery_callback(error, message):
print("delivery_callback. error={}. message={}".format(error, message))
print("message.topic={}".format(message.topic()))
print("message.timestamp={}".format(message.timestamp()))
print("message.key={}".format(message.key()))
print("message.value={}".format(message.value()))
print("message.partition={}".format(message.partition()))
print("message.offset={}".format(message.offset()))
def produce_string_messages(kafka_producer, topic_name, num_messages):
start_time = timeit.default_timer()
for i in range(num_messages):
kafka_producer.produce(topic_name, value="cf-k test. v{}".format(i), on_delivery=delivery_callback)
elapsed = timeit.default_timer() - start_time
print("completed producing messages. They are queued for delivery. elapsed={}. elapsed/msg={}".format(elapsed, elapsed/num_messages))
if __name__ == "__main__":
print("starting")
conf = {
'bootstrap.servers': "kafka-broker-1:9092"
}
kafka_producer = confluent_kafka.Producer(conf)
print("opened KafkaProducer")
produce_string_messages(kafka_producer, "my-string-topic", 3)
print("flushing...")
kafka_producer.flush()
print("exiting")
生產:
starting
opened KafkaProducer
completed producing messages. They are queued for delivery. elapsed=0.000994920730591. elapsed/msg=0.00033164024353
flushing...
delivery_callback. error=None. message=<cimpl.Message object at 0x10f986ec0>
message.topic=my-string-topic
message.timestamp=(1, 1508451238822L)
message.key=None
message.value=cf-k test. v0
message.partition=0
message.offset=0
delivery_callback. error=None. message=<cimpl.Message object at 0x10f986ec0>
message.topic=my-string-topic
message.timestamp=(1, 1508451238822L)
message.key=None
message.value=cf-k test. v1
message.partition=0
message.offset=0
delivery_callback. error=None. message=<cimpl.Message object at 0x10f986ec0>
message.topic=my-string-topic
message.timestamp=(1, 1508451238822L)
message.key=None
message.value=cf-k test. v2
message.partition=0
message.offset=24
exiting
注意message.offset()
是用於第一兩個消息和用於第三非零爲零。如果我再次運行這個測試程序,通過3發送三封郵件,第三message.offset
增量這看起來只是其中message.offset()
常常錯誤地返回0。
完美。謝謝!作爲主要作者,您是否可以回覆此問題:https://stackoverflow.com/questions/44732214/apt-get-install-librdkafka1-fails-on-debian-9-x-due-to-libssl-dependency – clay