hadoop集群启动成功，spark集群启动报错

<p>环境说明：</p><p><strong>centos 6.8,64位</strong></p><p><strong>hadoop-2.6.5.tar</strong></p><p><strong>spark-2.4.0-bin-without-hadoop</strong></p><p><strong>java 1.8</strong></p><p><br ></p><p>老师您好，参见您的这个帖子<br ></p><p><a href="https://dblab.xmu.edu.cn/blog/1714-2/" >https://dblab.xmu.edu.cn/blog/1714-2/</a> </p><p>hadoop,spark我都正确安装了，</p><p><br ></p><p>#hadoop启动OK</p><p><code class="brush:bash;toolbar:false" >cd&nbsp;/usr/local/hadoop/ sbin/start-all.sh</code></p><p><br ></p><p>#spark启动出现了如下错误，请问是什么原因呢，希望老师您能抽空解答下，</p><p><code class="brush:bash;toolbar:false" >[hadoop@devin&nbsp;sbin]$&nbsp;pwd /usr/local/spark/sbin [hadoop@devin&nbsp;sbin]$&nbsp;start-master.sh starting&nbsp;org.apache.spark.deploy.master.Master,&nbsp;logging&nbsp;to&nbsp;/usr/local/spark/logs/spark-hadoop-org.apache.spark.deploy.master.Master-1-devin.out failed&nbsp;to&nbsp;launch:&nbsp;nice&nbsp;-n&nbsp;0&nbsp;/usr/local/spark/bin/spark-class&nbsp;org.apache.spark.deploy.master.Master&nbsp;--host&nbsp;devin&nbsp;--port&nbsp;7077&nbsp;--webui-port&nbsp;8080 &nbsp;&nbsp; at&nbsp;java.net.URLClassLoader.defineClass(URLClassLoader.java:443) &nbsp;&nbsp; at&nbsp;java.net.URLClassLoader.access$100(URLClassLoader.java:65) &nbsp;&nbsp; at&nbsp;java.net.URLClassLoader$1.run(URLClassLoader.java:355) &nbsp;&nbsp; at&nbsp;java.net.URLClassLoader$1.run(URLClassLoader.java:349) &nbsp;&nbsp; at&nbsp;java.security.AccessController.doPrivileged(Native&nbsp;Method) &nbsp;&nbsp; at&nbsp;java.net.URLClassLoader.findClass(URLClassLoader.java:348) &nbsp;&nbsp; at&nbsp;java.lang.ClassLoader.loadClass(ClassLoader.java:430) &nbsp;&nbsp; at&nbsp;sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:323) &nbsp;&nbsp; at&nbsp;java.lang.ClassLoader.loadClass(ClassLoader.java:363) &nbsp;&nbsp; at&nbsp;sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482) full&nbsp;log&nbsp;in&nbsp;/usr/local/spark/logs/spark-hadoop-org.apache.spark.deploy.master.Master-1-devin.out</code></p><p>日志查看如下，</p><p><code class="brush:bash;toolbar:false" >[hadoop@devin&nbsp;logs]$&nbsp;cat&nbsp;spark-hadoop-org.apache.spark.deploy.master.Master-1-devin.out Exception&nbsp;in&nbsp;thread&nbsp;&quot;main&quot;&nbsp;java.lang.UnsupportedClassVersionError:&nbsp;org/apache/spark/launcher/Main&nbsp;:&nbsp;Unsupported&nbsp;major.minor&nbsp;version&nbsp;52.0 at&nbsp;java.lang.ClassLoader.defineClass1(Native&nbsp;Method) at&nbsp;java.lang.ClassLoader.defineClass(ClassLoader.java:808) at&nbsp;java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at&nbsp;java.net.URLClassLoader.defineClass(URLClassLoader.java:443) at&nbsp;java.net.URLClassLoader.access$100(URLClassLoader.java:65) at&nbsp;java.net.URLClassLoader$1.run(URLClassLoader.java:355) at&nbsp;java.net.URLClassLoader$1.run(URLClassLoader.java:349) at&nbsp;java.security.AccessController.doPrivileged(Native&nbsp;Method) at&nbsp;java.net.URLClassLoader.findClass(URLClassLoader.java:348) at&nbsp;java.lang.ClassLoader.loadClass(ClassLoader.java:430) at&nbsp;sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:323) at&nbsp;java.lang.ClassLoader.loadClass(ClassLoader.java:363) at&nbsp;sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)</code></p>