spark安装后启动：
[zdwy@master spark]$ sbin/start-all.sh
starting org.apache.spark.deploy.master.Master, logging to /home/zdwy/cdh5.9/spark/logs/spark-zdwy-org.apache.spark.deploy.master.Master-1-master.out
failed to launch org.apache.spark.deploy.master.Master:
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
full log in /home/zdwy/cdh5.9/spark/logs/spark-zdwy-org.apache.spark.deploy.master.Master-1-master.out
slave1: starting org.apache.spark.deploy.worker.Worker, logging to /home/zdwy/cdh5.9/spark/logs/spark-zdwy-org.apache.spark.deploy.worker.Worker-1-slave1.out
slave2: starting org.apache.spark.deploy.worker.Worker, logging to /home/zdwy/cdh5.9/spark/logs/spark-zdwy-org.apache.spark.deploy.worker.Worker-1-slave2.out
slave1: failed to launch org.apache.spark.deploy.worker.Worker:
slave1: at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
slave1: ... 6 more
slave1: full log in /home/zdwy/cdh5.9/spark/logs/spark-zdwy-org.apache.spark.deploy.worker.Worker-1-slave1.out
slave2: failed to launch org.apache.spark.deploy.worker.Worker:
slave2: at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
slave2: ... 6 more
slave2: full log in /home/zdwy/cdh5.9/spark/logs/spark-zdwy-org.apache.spark.deploy.worker.Worker-1-slave2.out
原因：缺少hadoop和spark之间通信的jar包
解决方案：下载3个jar包：jackson-core-xxx.jar,jackson-annotations-xxx.jar,jackson-databind-xxx.jar,下载地址：http://mvnrepository.com/artifact/com.fasterxml.jackson.core/
下载后将jar包放入到hadoop/share/hadoop/commom/目录下，重新启动spark即可。