add mqtt

Author: Davies Liu

python/pyspark/streaming/kafka.py

@@ -68,4 +68,4 @@ def createStream(ssc, zkQuorum, groupId, topics,
             stream = stream.map(lambda (k, v): (keyDecoder(k), v))
         if valueDecoder is not None:
             stream = stream.mapValues(valueDecoder)
-        return stream
+        return stream

python/pyspark/streaming/mqtt.py

@@ -0,0 +1,53 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+
+from py4j.java_gateway import java_import, Py4JError
+
+from pyspark.storagelevel import StorageLevel
+from pyspark.serializers import UTF8Deserializer
+from pyspark.streaming import DStream
+
+__all__ = ['MQTTUtils']
+
+
+class MQTTUtils(object):
+
+    @staticmethod
+    def createStream(ssc, brokerUrl, topic, storageLevel=StorageLevel.MEMORY_AND_DISK_SER_2):
+        """
+        Create an input stream that receives messages pushed by a MQTT publisher.
+
+        :param ssc:  StreamingContext object
+        :param brokerUrl:  Url of remote MQTT publisher
+        :param topic:  Topic name to subscribe to
+        :param storageLevel:  RDD storage level.
+        :return: A DStream object
+        """
+        java_import(ssc._jvm, "org.apache.spark.streaming.mqtt.MQTTUtils")
+        jlevel = ssc._sc._getJavaStorageLevel(storageLevel)
+        try:
+            jstream = ssc._jvm.MQTTUtils.createStream(ssc._jssc, brokerUrl, topic, jlevel)
+        except Py4JError, e:
+            if 'call a package' in e.message:
+                print "No MQTT package, please build it and add it into classpath:"
+                print " $ sbt/sbt streaming-mqtt/package"
+                print " $ bin/submit --driver-class-path external/mqtt/target/scala-2.10/" \
+                      "spark-streaming-mqtt_2.10-1.3.0-SNAPSHOT.jar"
+                raise Exception("No mqtt package")
+            raise e
+        return DStream(jstream, ssc, UTF8Deserializer())