我正在尝试将数据从Google BigQuery加载到在Google Dataproc上运行的Spark中(我正在使用Java)。我尝试按照此处的说明进行操作:https://cloud.google.com/dataproc/docs/tutorials/bigquery-connector-spark-example
我收到错误消息:“ ClassNotFoundException: Failed to find data source: bigquery
。”
我的pom.xml看起来像这样:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.virtualpairprogrammers</groupId>
<artifactId>learningSpark</artifactId>
<version>0.0.3-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>com.google.cloud.spark</groupId>
<artifactId>spark-bigquery_2.11</artifactId>
<version>0.9.1-beta</version>
<classifier>shaded</classifier>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<archive>
<manifest>
<mainClass>com.virtualpairprogrammers.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
在我的pom.xml文件中添加了依赖项之后,要下载大量内容以构建.jar,所以我认为我应该具有正确的依赖项?但是,Eclipse还警告我“从不使用import com.google.cloud.spark.bigquery”。
这是我收到错误的代码的一部分:
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;
import com.google.cloud.spark.bigquery.*;
public class Main {
public static void main(String[] args) {
SparkSession spark = SparkSession.builder()
.appName("testingSql")
.getOrCreate();
Dataset<Row> data = spark.read().format("bigquery")
.option("table","project.dataset.tablename")
.load()
.cache();
答案 0 :(得分:1)
我认为您只是将BQ连接器添加为编译时间依赖项,但是在运行时缺少它。您需要制作一个在工作jar中包含连接器的uber jar(需要更新文档),或者在提交工作gcloud dataproc jobs submit spark --properties spark.jars.packages=com.google.cloud.spark:spark-bigquery_2.11:0.9.1-beta
时将其包括在内。
答案 1 :(得分:-1)
我遇到了同样的问题,并将格式从“bigquery”更新为“com.google.cloud.spark.bigquery”,这对我有用。