sparksql啟動報錯The specified datastore driver ("com.mysql.jdbc.Driver") was not found in the CLASSPATH
要啟動sparksql並訪問到Hive，有兩個步驟：
1、將$HIVE_HOME/conf/hive-site.xml拷貝到$SPARK_HOME/conf下 2、配置MySQL驅動包，將MySQL驅動包放在一個自定義目錄下，在$SPARK_HOME/conf裡面的spark-defaults.conf配置兩個引數 spark.executor.extraClassPath /home/hadoop/jars/mysql-connector-java-5.1.34.jar spark.driver.extraClassPath /home/hadoop/jars/mysql-connector-java-5.1.34.jar 或者可以將mysql驅動包放到$SPARK_HOME/lib下，但是如果叢集升級需要再次操作這個步驟，所以推薦第一個做法。
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