Github user guoxiaolongzte commented on the issue:
https://github.com/apache/spark/pull/17580
@jerryshao
Excuse me,I would like to ask, these examples of Java examples, why use
some of the Scala to write it?thank you!
SparkConf sparkConf = new
SparkConf().setAppName("**JavaKafkaWordCount**");
// Create the context with 2 seconds batch size
JavaStreamingContext jssc = new JavaStreamingContext(sparkConf, new
Duration(2000));
int numThreads = Integer.parseInt(args[3]);
Map<String, Integer> topicMap = new HashMap<>();
String[] topics = args[2].split(",");
for (String topic: topics) {
topicMap.put(topic, numThreads);
}
JavaPairReceiverInputDStream<String, String> messages =
KafkaUtils.createStream(jssc, args[0], args[1], topicMap);
JavaDStream<String> lines = messages.map**(Tuple2::_2);**
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