Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/4229#discussion_r34662049
--- Diff:
external/mqtt/src/main/scala/org/apache/spark/streaming/mqtt/MQTTUtils.scala ---
@@ -74,3 +75,24 @@ object MQTTUtils {
createStream(jssc.ssc, brokerUrl, topic, storageLevel)
}
}
+
+/**
+ * This is a helper class that wraps the methods in MQTTUtils into more
Python-friendly class and
+ * function so that it can be easily instantiated and called from Python's
MQTTUtils.
+ */
+private class MQTTUtilsPythonHelper {
+
+ def createStream(
+ jssc: JavaStreamingContext,
+ brokerUrl: String,
+ topic: String,
+ storageLevel: StorageLevel
+ ): JavaDStream[Array[Byte]] = {
+ val dstream = MQTTUtils.createStream(jssc, brokerUrl, topic,
storageLevel)
+ dstream.map(new Function[String, Array[Byte]] {
+ override def call(data: String): Array[Byte] = {
+ data.getBytes("UTF-8")
--- End diff --
You don't need to convert to bytes. PythonRDD will do it. You can pass a
Sting DStream and use `UTF8Deserializer` in Python directly.
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