安装好spark（spark-2.0.0-bin-hadoop2.6）后在ubuntu的终端输入pyspark启动时出现错误提示：Exception in thread "main" java.lang.UnsupportedClassVersionError，上百度搜了一下，很多博客说这是因为The problem is that you compiled with/for Java 8, but you are running Spark on Java 7 or older，所以就下载安装了java8,重新在ubuntu终端输入pyspark启动后成功：
如何在ubuntu14下下载安装java8可以参照zhuxp1的博客：https://blog.csdn.net/zhuxiaoping54532/article/details/70158200