pyspark kafka createDirectStream和createStream 区别

from pyspark.streaming.kafka import KafkaUtils

 kafkaStream = KafkaUtils.createStream(streamingContext, 
     [ZK quorum], [consumer group id], [per-topic number of Kafka partitions to consume])

 from pyspark.streaming.kafka import KafkaUtils
 directKafkaStream = KafkaUtils.createDirectStream(ssc, [topic], {"metadata.broker.list": brokers})

就是参数不一样。其中createStream用的ZK quorum是zk的2181端口。而createDirectStream用的是kafka进程9092端口。

Kafka的进程ID为9300，占用端口为9092

QuorumPeerMain为对应的zookeeper实例，进程ID为6379，在2181端口监听

所以在运行官方例子时候

一个是

./bin/spark-submit --jars ~/spark-streaming-kafka-0-8-assembly_2.11-2.2.0.jar examples/src/main/python/streaming/direct_kafka_wordcount.py localhost:9092 test

另外一个是：

 ./bin/spark-submit --jars ~/spark-streaming-kafka-0-8-assembly_2.11-2.2.0.jar examples/src/main/python/streaming/direct_kafka_wordcount.py localhost:2181 test

参考：

https://spark.apache.org/docs/1.6.1/streaming-kafka-integration.html

http://zhangfengzhe.blog.51cto.com/8855103/1556650