java.lang.ClassNotFoundException:com.mysql.jdbc.Driver在Amazon EMR上的Jupyter笔记本中

Question

在尝试从EMR Jupyter Notebook连接到RDS中的MySql数据库时，我发现以下错误：

使用的代码：

from pyspark.sql import SparkSession
hostname="hostname"
dbname = "mysql"
jdbcPort = 3306
username = "user"
password = "password"
jdbc_url = "jdbc:mysql://{0}:{1}/{2}?user={3}&password={4}".format(hostname,jdbcPort, dbname,username,password)
query = "(select * from framework.File_Columns) as table1"
df1 = spark.read.format('jdbc').options(driver = 'com.mysql.jdbc.Driver',url=jdbc_url, dbtable=query ).load()
df1.show()

错误消息：

An error occurred while calling o89.showString. : org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 4 times, most recent failure: Lost task 0.3 in stage 0.0 (TID 3, ip-172-31-37-50.us-west-2.compute.internal, executor 1): java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

我已将所需的mysql-connector-java-5.1.47.jar下载到/home/hadoop/mysql-connector-java-5.1.47.jar，并更新了Spark配置文件，如下所示：

spark.master                     yarn

spark.driver.extraClassPath      :/usr/lib/hadoop-lzo/lib/*:/usr/lib/hadoop/hadoop-aws.jar:/usr/share/aws/aws-java-sdk/*:/usr/share/aws/emr/emrfs/conf:/usr/share/aws/emr/emrfs/lib/*:/usr/share/aws/emr/emrfs/auxlib/*:/usr/share/aws/emr/goodies/lib/emr-spark-goodies.jar:/usr/share/aws/emr/security/conf:/usr/share/aws/emr/security/lib/*:/usr/share/aws/hmclient/lib/aws-glue-datacatalog-spark-client.jar:/usr/share/java/Hive-JSON-Serde/hive-openx-serde.jar:/usr/share/aws/sagemaker-spark-sdk/lib/sagemaker-spark-sdk.jar:/home/hadoop/extrajars/*:/home/hadoop/extrajars/mysql-connector-java-5.1.47.jar

spark.driver.extraLibraryPath    /usr/lib/hadoop/lib/native:/usr/lib/hadoop-lzo/lib/native:/home/hadoop/extrajars/*:/home/hadoop/extrajars/mysql-connector-java-5.1.47.jar

spark.executor.extraClassPath    :/usr/lib/hadoop-lzo/lib/*:/usr/lib/hadoop/hadoop-aws.jar:/usr/share/aws/aws-java-sdk/*:/usr/share/aws/emr/emrfs/conf:/usr/share/aws/emr/emrfs/lib/*:/usr/share/aws/emr/emrfs/auxlib/*:/usr/share/aws/emr/goodies/lib/emr-spark-goodies.jar:/usr/share/aws/emr/security/conf:/usr/share/aws/emr/security/lib/*:/usr/share/aws/hmclient/lib/aws-glue-datacatalog-spark-client.jar:/usr/share/java/Hive-JSON-Serde/hive-openx-serde.jar:/usr/share/aws/sagemaker-spark-sdk/lib/sagemaker-spark-sdk.jar:/home/hadoop/extrajars/*:/home/hadoop/extrajars/mysql-connector-java-5.1.47.jar

spark.executor.extraLibraryPath  /usr/lib/hadoop/lib/native:/usr/lib/hadoop-lzo/lib/native:/home/hadoop/extrajars/*:/home/hadoop/extrajars/mysql-connector-java-5.1.47.jar

为了从Jupyter笔记本连接到MySql数据库，我还需要做什么

Answer 1

由于从Jupyter笔记本运行驱动程序类时无法找到驱动程序类，为了避免这种情况，可以尝试将mysql-connector-java-5.1.47.jar复制到$SPARK_HOME/jars文件夹。它将根据我的个人经验解决您的驾驶员问题