Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/3715#discussion_r23661437 --- Diff: python/pyspark/streaming/kafka.py --- @@ -0,0 +1,82 @@ +# +# 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_collections import MapConverter +from py4j.java_gateway import java_import, Py4JError + +from pyspark.storagelevel import StorageLevel +from pyspark.serializers import PairDeserializer, NoOpSerializer +from pyspark.streaming import DStream + +__all__ = ['KafkaUtils', 'utf8_decoder'] + + +def utf8_decoder(s): + """ Decode the unicode as UTF-8 """ + return s and s.decode('utf-8') + + +class KafkaUtils(object): + + @staticmethod + def createStream(ssc, zkQuorum, groupId, topics, + storageLevel=StorageLevel.MEMORY_AND_DISK_SER_2, + keyDecoder=utf8_decoder, valueDecoder=utf8_decoder): + """ + Create an input stream that pulls messages from a Kafka Broker. + + :param ssc: StreamingContext object + :param zkQuorum: Zookeeper quorum (hostname:port,hostname:port,..). + :param groupId: The group id for this consumer. + :param topics: Dict of (topic_name -> numPartitions) to consume. + Each partition is consumed in its own thread. + :param storageLevel: RDD storage level. + :param keyDecoder: A function used to decode key + :param valueDecoder: A function used to decode value + :return: A DStream object + """ + java_import(ssc._jvm, "org.apache.spark.streaming.kafka.KafkaUtils") + + param = { + "zookeeper.connect": zkQuorum, + "group.id": groupId, + "zookeeper.connection.timeout.ms": "10000", + } + if not isinstance(topics, dict): + raise TypeError("topics should be dict") + jtopics = MapConverter().convert(topics, ssc.sparkContext._gateway._gateway_client) + jparam = MapConverter().convert(param, ssc.sparkContext._gateway._gateway_client) + jlevel = ssc._sc._getJavaStorageLevel(storageLevel) + + def getClassByName(name): + return ssc._jvm.org.apache.spark.util.Utils.classForName(name) + + try: + array = getClassByName("[B") + decoder = getClassByName("kafka.serializer.DefaultDecoder") + jstream = ssc._jvm.KafkaUtils.createStream(ssc._jssc, array, array, decoder, decoder, + jparam, jtopics, jlevel) + except Py4JError, e: + # TODO: use --jar once it also work on driver + if not e.message or 'call a package' in e.message: --- End diff -- This is clever; the 'call a package' errors are _really_ confusing to users, so this message is pretty helpful.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org