Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/3947#discussion_r22707632
--- Diff:
examples/src/main/scala/org/apache/spark/examples/streaming/MQTTWordCount.scala
---
@@ -42,25 +41,34 @@ object MQTTPublisher {
StreamingExamples.setStreamingLogLevels()
val Seq(brokerUrl, topic) = args.toSeq
+ val tempDir = Utils.createTempDir()
+
+ var client: MqttClient = null
try {
- var peristance:MqttClientPersistence =new
MqttDefaultFilePersistence("/tmp")
+ val peristance:MqttClientPersistence = new
MqttDefaultFilePersistence(tempDir.getAbsolutePath)
client = new MqttClient(brokerUrl, MqttClient.generateClientId(),
peristance)
- } catch {
- case e: MqttException => println("Exception Caught: " + e)
- }
- client.connect()
+ client.connect()
+
+ val msgtopic: MqttTopic = client.getTopic(topic)
+ val msgContent: String = "hello mqtt demo for spark streaming"
+ val message: MqttMessage = new
MqttMessage(msgContent.getBytes("utf-8"))
- val msgtopic: MqttTopic = client.getTopic(topic)
- val msg: String = "hello mqtt demo for spark streaming"
+ while (true) {
+ msgtopic.publish(message)
+ println("Published data. topic: " + msgtopic.getName() + "
Message: " + message)
+ }
+ }
+
+ catch {
+ case e: MqttException => println("Exception Caught: " + e)
+ }
- while (true) {
- val message: MqttMessage = new
MqttMessage(String.valueOf(msg).getBytes("utf-8"))
- msgtopic.publish(message)
- println("Published data. topic: " + msgtopic.getName() + " Message:
" + message)
+ finally {
+ client.disconnect()
+ Utils.deleteRecursively(tempDir)
--- End diff --
Do not use this. This Utils class is private to Spark, and should not be
used in an example as other wont be able to access this class (unless they put
their code in package org.apache.spark....).
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