使用spark操作kudu

Spark与KUDU集成支持：

• DDL操作（创建/删除）

• 本地Kudu RDD

• Native Kudu数据源，用于DataFrame集成

• 从kudu读取数据

• 从Kudu执行插入/更新/ upsert /删除

• 谓词下推

• Kudu和Spark SQL之间的模式映射

  到目前为止，我们已经听说过几个上下文，例如SparkContext，SQLContext，HiveContext，SparkSession，现在，我们将使用Kudu引入一个KuduContext。这是可在Spark应用程序中广播的主要可序列化对象。此类代表在Spark执行程序中与Kudu Java客户端进行交互。

  KuduContext提供执行DDL操作所需的方法，与本机Kudu RDD的接口，对数据执行更新/插入/删除，将数据类型从Kudu转换为Spark等。

  比较常见的操作：

// Create a Spark and SQL context
val sc = new SparkContext(sparkConf)
val sqlContext = new SQLContext(sc)
 
// Comma-separated list of Kudu masters with port numbers
val master1 = "ip-10-13-4-249.ec2.internal:7051"
val master2 = "ip-10-13-5-150.ec2.internal:7051"
val master3 = "ip-10-13-5-56.ec2.internal:7051"
val kuduMasters = Seq(master1, master2, master3).mkString(",")
 
// Create an instance of a KuduContext
val kuduContext = new KuduContext(kuduMasters)

Maven导包

 <repositories>
        <repository>
            <id>cloudera</id>
            <url>https://repository.cloudera.com/artifactory/cloudera-repos/</url>
        </repository>
    </repositories>


<dependencies>
    <!-- https://mvnrepository.com/artifact/org.apache.kudu/kudu-client -->
    <dependency>
        <groupId>org.apache.kudu</groupId>
        <artifactId>kudu-client</artifactId>
        <version>1.6.0-cdh5.14.0</version>
        <scope>test</scope>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.apache.kudu/kudu-client-tools -->
    <dependency>
        <groupId>org.apache.kudu</groupId>
        <artifactId>kudu-client-tools</artifactId>
        <version>1.6.0-cdh5.14.0</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.apache.kudu/kudu-spark2 -->
    <dependency>
        <groupId>org.apache.kudu</groupId>
        <artifactId>kudu-spark2_2.11</artifactId>
        <version>1.6.0-cdh5.14.0</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-sql -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.11</artifactId>
        <version>2.1.0</version>
    </dependency>
</dependencies>

具体详细代码看下一章介绍