Spark jar包找不到解决方法，sparkjar


今天在使用Spark中DataFrame往Mysql中插入RDD，但是一直报出以下的异常次信息：

[itelbog@iteblog ~]$  bin/spark-submit --master local[2] 
	--jars lib/mysql-connector-java-5.1.35.jar 
	--class  spark.sparkToJDBC ./spark-test_2.10-1.0.jar

spark assembly has been built with Hive, including Datanucleus jars on classpath
Exception in thread "main" java.sql.SQLException: No suitable driver found for 
jdbc:mysql://www.iteblog.com:3306/spark?user=root&password=123&useUnicode=
true&characterEncoding=utf8&autoReconnect=true
	at java.sql.DriverManager.getConnection(DriverManager.java:602)
	at java.sql.DriverManager.getConnection(DriverManager.java:207)
	at org.apache.spark.sql.DataFrame.createJDBCTable(DataFrame.scala:1189)
	at spark.<span class="wp_keywordlink_affiliate"><a href="http://www.iteblog.com/archives/tag/spark" title="" target="_blank" data-original-title="View all posts in Spark">Spark</a></span>ToJDBC$.toMysqlFromJavaBean(SparkToJDBC.scala:20)
	at spark.SparkToJDBC$.main(SparkToJDBC.scala:47)
	at spark.SparkToJDBC.main(SparkToJDBC.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$
$runMain(SparkSubmit.scala:569)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

感觉很奇怪，我在启动作业的时候加了Mysql驱动啊在，怎么会出现这种异常呢？？经过查找，发现在–jars参数里面加入Mysql是没有用的。通过查找，发现提交的作业可以通过加入--driver-class-path参数来设置driver的classpath，试了一下果然没有出现错误！

[itelbog@iteblog ~]$  bin/spark-submit --master local[2] 
	--driver-class-path lib/mysql-connector-java-5.1.35.jar 
	--class  spark.SparkToJDBC ./spark-test_2.10-1.0.jar
其实，我们还可以在spark安装包的conf/spark-env.sh通过配置SPARK_CLASSPATH来设置driver的环境变量，如下：

export SPARK_CLASSPATH=$SPARK_CLASSPATH:/iteblog/com/mysql-connector-java-5.1.35.jar

这样也可以解决上面出现的异常。但是，我们不能同时在conf/spark-env.sh里面配置SPARK_CLASSPATH和提交作业加上–driver-class-path参数，否则会出现以下异常：

[itelbog@iteblog ~]$  bin/spark-submit --master local[2] 
	--driver-class-path lib/mysql-connector-java-5.1.35.jar 
	--class  spark.SparkToJDBC ./spark-test_2.10-1.0.jar

Spark assembly has been built with Hive, including Datanucleus jars on classpath
Exception in thread "main" org.apache.spark.SparkException: 
	Found both spark.driver.extraClassPath and SPARK_CLASSPATH. Use only the former.
	at org.apache.spark.SparkConf$$anonfun$validateSettings$6$$anonfun$apply
$7.apply(SparkConf.scala:339)
	at org.apache.spark.SparkConf$$anonfun$validateSettings$6$$anonfun$apply
$7.apply(SparkConf.scala:337)
	at scala.collection.immutable.List.foreach(List.scala:318)
	at org.apache.spark.SparkConf$$anonfun$validateSettings$6.apply(SparkConf.scala:337)
	at org.apache.spark.SparkConf$$anonfun$validateSettings$6.apply(SparkConf.scala:325)
	at scala.Option.foreach(Option.scala:236)
	at org.apache.spark.SparkConf.validateSettings(SparkConf.scala:325)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:197)
	at spark.SparkToJDBC$.main(SparkToJDBC.scala:41)
	at spark.SparkToJDBC.main(SparkToJDBC.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$
		deploy$SparkSubmit$$runMain(SparkSubmit.scala:569)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

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