错误:SparkContext只能在驱动程序上使用，而不能在工作程序上运行的代码中使用.有关更多信息，请参见SPARK-5063 [英] ERROR:SparkContext can only be used on the driver, not in code that it run on workers. For more information, see SPARK-5063

问题描述

我目前正在使用ASN 1解码器.我将从生产者处获取十六进制十进制代码，并将其收集到消费者中. 然后，在我将十六进制代码转换为RDD之后，然后将十六进制值RDD传递给具有相同类Decode_Module的另一个函数，并将使用python asn1解码器对十六进制数据进行解码，然后将其返回并打印出来. 我不明白我的代码有什么问题，我也已经在工作节点中安装了asn1解析器依赖项. 我在lambda表达式或其他方式中调用的方式有任何错误.

I am presently working with ASN 1 Decoder.I will be getting a Hex decimal code from producer and i will be collecting it in consumer. Then after i will be converting the hex code to RDD and then pass the hex value RDD to another function with in same class Decode_Module and will be using python asn1 decoder to decode the hex data and return it back and print it. I don't understand whats wrong with my code.I have already installed my asn1 parser dependencies in worker nodes too. Any wrong with the way i call in lambda expression or something else.

我的错误:异常:看来您正在尝试从广播变量，操作或转换中引用SparkContext. SparkContext只能在驱动程序上使用，而不能在工作程序上运行的代码中使用.有关更多信息，请参阅SPARK-5063

My ERROR: Exception: It appears that you are attempting to reference SparkContext from a broadcast variable, action, or transformation. SparkContext can only be used on the driver, not in code that it run on workers. For more information, see SPARK-5063

请帮助我

我的验证码:

class telco_cn:

 def __init__(self,sc):
    self.sc = sc
    print ('in init function')
    logging.info('eneterd into init function')

 def decode_module(self,msg):
        try:
            logging.info('Entered into generate module')
            ### Providing input for module we need to load
            load_module(config_values['load_module'])
            ### Providing Value for Type of Decoding
            ASN1.ASN1Obj.CODEC = config_values['PER_DECODER']
            ### Providing Input for Align/UnAlign
            PER.VARIANT = config_values['PER_ALIGNED']
            ### Providing Input for pdu load
            pdu = GLOBAL.TYPE[config_values['pdu_load']]
            ### Providing Hex value to buf
            buf = '{}'.format(msg).decode('hex')
            return val
        except Exception as e:
            logging.debug('error in decode_module function %s' %str(e))


 def consumer_input(self,sc,k_topic):
            logging.info('entered into consumer input');print(k_topic)
            consumer = KafkaConsumer(ip and other values given)
            consumer.subscribe(k_topic)
            for msg in consumer:
                print(msg.value);
                a = sc.parallelize([msg.value])
                d = a.map(lambda x: self.decode_module(x)).collect()
                print d

if __name__ == "__main__":
    logging.info('Entered into main')
    conf = SparkConf()
    conf.setAppName('telco_consumer')
    conf.setMaster('yarn-client')
    sc = SparkContext(conf=conf)
    sqlContext = HiveContext(sc)
    cn = telco_cn(sc)
    cn.consumer_input(sc,config_values['kafka_topic'])

推荐答案

这是因为self.decode_module包含SparkContext的实例.

This is because self.decode_module contain instance of SparkContext.

要修复代码，可以使用@staticmethod:

To fix your code you can use @staticmethod:

class telco_cn:
    def __init__(self, sc):
        self.sc = sc

    @staticmethod
    def decode_module(msg):
        return msg

    def consumer_input(self, sc, k_topic):
        a = sc.parallelize(list('abcd'))
        d = a.map(lambda x: telco_cn.decode_module(x)).collect()
        print d


if __name__ == "__main__":
    conf = SparkConf()
    sc = SparkContext(conf=conf)
    cn = telco_cn(sc)
    cn.consumer_input(sc, '')

有关更多信息:

http://spark.apache .org/docs/latest/programming-guide.html#passing-functions-to-spark

这篇关于错误:SparkContext只能在驱动程序上使用，而不能在工作程序上运行的代码中使用.有关更多信息，请参见SPARK-5063的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！