Github user dragos commented on a diff in the pull request:
https://github.com/apache/spark/pull/4178#discussion_r24005992
--- Diff:
examples/src/main/scala/org/apache/spark/examples/streaming/MQTTWordCount.scala
---
@@ -42,25 +40,30 @@ object MQTTPublisher {
StreamingExamples.setStreamingLogLevels()
val Seq(brokerUrl, topic) = args.toSeq
+
+ var client: MqttClient = null
try {
- var peristance:MqttClientPersistence =new
MqttDefaultFilePersistence("/tmp")
- client = new MqttClient(brokerUrl, MqttClient.generateClientId(),
peristance)
- } catch {
- case e: MqttException => println("Exception Caught: " + e)
- }
+ val persistence = new MemoryPersistence()
+ client = new MqttClient(brokerUrl, MqttClient.generateClientId(),
persistence)
- client.connect()
+ client.connect()
- val msgtopic: MqttTopic = client.getTopic(topic)
- val msg: String = "hello mqtt demo for spark streaming"
+ val msgtopic = client.getTopic(topic)
+ val msgContent = "hello mqtt demo for spark streaming"
+ val message = new MqttMessage(msgContent.getBytes("utf-8"))
- while (true) {
- val message: MqttMessage = new
MqttMessage(String.valueOf(msg).getBytes("utf-8"))
- msgtopic.publish(message)
- println("Published data. topic: " + msgtopic.getName() + " Message:
" + message)
+ while (true) {
+ Thread.sleep(100)
+ msgtopic.publish(message)
+ println("Published data. topic: %s; Message:
%s".format(msgtopic.getName(), message))
+ }
+
+ } catch {
+ case e: MqttException => println("Exception Caught: " + e)
--- End diff --
I don't see the point in swallowing this exception. Why not let it
percolate, it will anyway print the stacktrace and stop the process?
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