再启动spark时报错：
Caused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the “DBCP” plugin to create a ConnectionPool gave an error : The specified datastore driver (“com.mysql.jdbc.Driver”) was not found in the CLASSPATH. Please check your CLASSPATH specification, and the name of the driver.
是因为在使用hive on spark时 启动没有找到 mysql的驱动
解决：
1、
再启动时把mysql驱动加上， spark-shell --master local[2] --jars $HIVE_HOME/lib/mysql驱动
2 在spark-env.sh中添加 export
SPARK_CLASSPATH=$HIVE_HOME/lib/mysql-connector-java-5.1.17.jar