java.lang.ClassNotFoundException: com.mysql.jdbc.Driver在亚马逊电子病历上的木星笔记本

Question

在尝试从EMR木星笔记本连接RDS中的MySql数据库时，我发现了以下错误：

所用代码：

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：

调用o89.showString时发生错误。：：org.apache.spark.SparkException:由于阶段失败而中止作业:阶段0.0中的任务0失败4次，最近的失败:阶段0.0中丢失的任务0.3 (TID 3，ip-172-31-37-50.us-west-2计算程序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，并按以下方式更新了Spark配置文件：

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

我还需要做些什么，以便从木星笔记本连接到MySql DB吗？

Answer 1

当您从朱庇特笔记本中运行它时，它无法找到驱动程序类，为了避免这种情况，您可以尝试将mysql-connector-java-5.1.47.jar复制到$SPARK_HOME/jars文件夹中。它将解决您的司机问题，根据我的个人经验。

Answer 2

您也可以这样做：

​

spark.conf.set("jars", "s3://bucket-name/folder-name/mysql-connector-java-5.1.38-bin.jar")

​