运行SparkStreaming的NetworkWordCount实例出错：Error connecting to localhost:9999 java.net.ConnectException: Connection refused 解决办法

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运行SparkStreaming的NetworkWordCount实例出错：Error connecting to localhost:9999 java.net.ConnectException: Connection refused 解决办法

一.背景首先按照Spark的官方文档来运行此实例,具体方法参见这里,当运行命令$ nc -lk 9999开启端口后,再运行命令$ ./bin/run-example streaming.NetworkWordCount localhost 9999,却出现错误"Error connecting to localhost:9999 java.net.ConnectException: Connection refused ",也就是9999端口无法连接. 二.解决办法 (1)首先代码要…

error: not found: value sqlContext/import sqlContext.implicits._/error: not found: value sqlContext /import sqlContext.sql/Caused by: java.net.ConnectException: Connection refused

1.今天启动启动spark的spark-shell命令的时候报下面的错误,百度了很多,也没解决问题,最后想着是不是没有启动hadoop集群的问题 ,可是之前启动spark-shell命令是不用启动hadoop集群也是可以启动起来的.今天突然报错了. [hadoop@slaver1 spark--bin-hadoop2.]$ bin/spark-shell \ > --master spark://slaver1:7077 \ > --executor-memory 512M \ > --…

WARN Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn) java.net.ConnectException: Connection refused

1.启动kafka的脚本程序报如下所示的错误: [hadoop@slaver1 script_hadoop]$ kafka-start.sh start kafkaServer... [-- ::,] INFO Verifying properties (kafka.utils.VerifiableProperties) [-- ::,] INFO Property broker.id (kafka.utils.VerifiableProperties) [-- ::,] INFO Proper…

Error: IO_ERROR : java.io.IOException: Error while connecting Oozie server. No of retries = 5. Exception = Connection refused (Connection refused)解决办法（图文详解）

不多说,直接上干货! 问题详情解决办法 Copy/Paste oozie.services property tag set from oozie-default.xml to oozie-site.xml. Remove org.apache.oozie.service.KerberosHadoopAccessorService. https://stackoverflow.com/questions/44839025/oozie-connection-exception-has-occur…