1 Error initializing SparkContext A master URL must be set in your configuration
https://blog.csdn.net/caiandyong/article/details/51736980
2 zookeeper报错
java.net.ConnectException: Connection refused: no further information
本地和服务器端口不一致导致
3解决 Intellij IDEA Cannot Resolve Symbol ‘XXX’
点击File | Invalidate Caches，清理了缓存重启IDEA就可以了。
https://blog.csdn.net/chinazgr/article/details/51050543
