Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4178#discussion_r24432610
--- Diff:
examples/src/main/scala/org/apache/spark/examples/streaming/MQTTWordCount.scala
---
@@ -42,25 +40,33 @@ 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)
+ val persistence = new MemoryPersistence()
+ client = new MqttClient(brokerUrl, MqttClient.generateClientId(),
persistence)
+
+ client.connect()
+
+ val msgtopic = client.getTopic(topic)
+ val msgContent = "hello mqtt demo for spark streaming"
+ val message = new MqttMessage(msgContent.getBytes("utf-8"))
+
+ while (true) {
+ try {
+ msgtopic.publish(message)
+ println("Published data. topic: %s; Message:
%s".format(msgtopic.getName(), message))
+ } catch {
+ case e: MqttException if e.getReasonCode ==
MqttException.REASON_CODE_MAX_INFLIGHT =>
--- End diff --
OK, at least log a warning. Or else this could silently spin forever as
long as the queue is full. Yes it's an example but still seems funny.
Also, really minor but the `org.apache.spark.streaming.StreamingContext`
import you moved in `MQTTUtils` is now out of order.
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