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基于spark3.4.2+iceberg1.6.1搭建本地调试环境

环境准备

• IntelliJ IDEA 2024.1.2 (Ultimate Edition)
• JDK 1.8
• Spark 3.4.2
• Iceberg 1.6.1

使用maven构建sparksql

pom文件

<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.donny.demo</groupId><artifactId>iceberg-demo</artifactId><version>1.0-SNAPSHOT</version><packaging>jar</packaging><name>iceberg-demo</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><spark.version>3.4.2</spark.version><iceberg.version>1.6.1</iceberg.version><parquet.version>1.13.1</parquet.version><avro.version>1.11.3</avro.version><parquet.hadoop.bundle.version>1.8.1</parquet.hadoop.bundle.version></properties><dependencies><dependency><groupId>org.apache.spark</groupId><artifactId>spark-core_2.12</artifactId><version>${spark.version}</version><exclusions><exclusion><groupId>org.apache.avro</groupId><artifactId>avro</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.spark</groupId><artifactId>spark-sql_2.12</artifactId><version>${spark.version}</version><exclusions><exclusion><groupId>org.apache.parquet</groupId><artifactId>parquet-column</artifactId></exclusion><exclusion><groupId>org.apache.parquet</groupId><artifactId>parquet-hadoop-bundle</artifactId></exclusion><exclusion><groupId>org.apache.parquet</groupId><artifactId>parquet-hadoop</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.iceberg</groupId><artifactId>iceberg-core</artifactId><version>${iceberg.version}</version></dependency><dependency><groupId>org.apache.iceberg</groupId><artifactId>iceberg-spark-3.4_2.12</artifactId><version>${iceberg.version}</version></dependency><dependency><groupId>org.apache.iceberg</groupId><artifactId>iceberg-spark-extensions-3.4_2.12</artifactId><version>${iceberg.version}</version><exclusions><exclusion><groupId>org.antlr</groupId><artifactId>antlr4</artifactId></exclusion><exclusion><groupId>org.antlr</groupId><artifactId>antlr4-runtime</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.parquet</groupId><artifactId>parquet-column</artifactId><version>${parquet.version}</version></dependency><dependency><groupId>org.apache.parquet</groupId><artifactId>parquet-hadoop</artifactId><version>${parquet.version}</version></dependency><dependency><groupId>org.apache.parquet</groupId><artifactId>parquet-hadoop-bundle</artifactId><version>${parquet.hadoop.bundle.version}</version></dependency><dependency><groupId>org.apache.avro</groupId><artifactId>avro</artifactId><version>${avro.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency></dependencies>
</project>

在 idea 中 直接使用iceberg 生成好的 runtime jar，无法attach 不上 iceberg 的源码，为了解决这个问题把maven 依赖改成上面的pom文件上的iceberg依赖。

<dependency><groupId>org.apache.iceberg</groupId><artifactId>iceberg-spark-runtime-3.4_2.12</artifactId><version>1.6.1</version>
</dependency>

编辑SparkSQL简单任务

1. 指定了 catalog 类型为 hadoop。可以方便简单的本地调试。
2. 创建非分区的iceberg原生表
3. 插入数据
4. 查询数据（展示数据）

package com.donny.demo;import org.apache.iceberg.expressions.Expressions;
import org.apache.iceberg.spark.Spark3Util;
import org.apache.iceberg.spark.actions.SparkActions;
import org.apache.spark.api.java.function.FilterFunction;
import org.apache.spark.sql.AnalysisException;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;
import org.apache.spark.sql.catalog.Table;import java.util.Objects;/*** @author 1792998761@qq.com* @version 1.0* @since 2024年09月26日*/
public class IcebergSparkDemo {public static void main(String[] args) throws AnalysisException {SparkSession spark = SparkSession.builder().master("local").appName("Iceberg spark example").config("spark.sql.extensions", "org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions").config("spark.sql.catalog.local", "org.apache.iceberg.spark.SparkCatalog").config("spark.sql.catalog.local.type", "hadoop") //指定catalog 类型.config("spark.sql.catalog.local.warehouse", "iceberg_warehouse").getOrCreate();spark.sql("create database iceberg_db");spark.sql("CREATE TABLE local.iceberg_db.table (id bigint, data string) USING iceberg ");spark.sql("INSERT INTO local.iceberg_db.table VALUES (1, 'a'), (2, 'b'), (3, 'c')");Dataset<Row> result = spark.sql("select * from local.iceberg_db.table order by data");result.show();spark.close();}
}

附录A iceberg术语

• Schema – 表中的字段名称和类型
• Partition spec – 定义如何从数据字段导出分区值。
• Partition tuple – 分区元组是存储在每个数据文件中的分区数据的元组或结构体。
• Snapshot – 表在某个时间点的状态，包括所有数据文件的集合。
• Snapshot log – 快照日志是记录表当前快照随时间变化情况的元数据日志。该日志是一个时间戳和ID对的列表:当前快照发生变化的时间和当前快照发生变化的ID。
• Manifest list – 列出清单文件的文件；每个快照一个。
• Manifest – 列出数据或删除文件的文件；快照的子集。
• Data file – 包含表行的文件。
• Delete file – 对表格中按位置或数据值删除的行进行编码的文件。

参考

Iceberg 源码阅读(一) 搭建本地调试环境