E-MapReduce：基礎使用

EMR-3.32.0以及後續版本中，已經將Hudi相關依賴整合到各個開源組件中，包括Spark、Hive和Presto，因此運行時不需要引入額外的Hudi依賴，只需要在pom檔案中添加Hudi依賴即可。不同的EMR版本使用的Hudi版本不同，詳細資料請參見下表。

<dependency>
   <groupId>org.apache.hudi</groupId>
   <artifactId>hudi-spark_2.11</artifactId>
   <!-- for spark3 <artifactId>hudi-spark_2.12</artifactId> -->
   <version>${hudi_version}</version>
  <scope>provided</scope>
</dependency>

樣本如下。

 val spark = SparkSession
      .builder()
      .master("local[*]")
      .appName("hudi test")
      .config("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
      .getOrCreate()

import spark.implicits._
    val df = (for (i <- 0 until 10) yield (i, s"a$i", 30 + i * 0.2, 100 * i + 10000, s"p${i % 5}"))
      .toDF("id", "name", "price", "version", "dt")

    df.write.format("hudi")
      .option(TABLE_NAME, "hudi_test_0")
      // .option(OPERATION_OPT_KEY, UPSERT_OPERATION_OPT_VAL) for update
      .option(OPERATION_OPT_KEY, INSERT_OPERATION_OPT_VAL) // for insert
      .option(RECORDKEY_FIELD_OPT_KEY, "id")
      .option(PRECOMBINE_FIELD_OPT_KEY, "version")
      .option(KEYGENERATOR_CLASS_OPT_KEY, classOf[SimpleKeyGenerator].getName)
      .option(HIVE_PARTITION_EXTRACTOR_CLASS_OPT_KEY, classOf[MultiPartKeysValueExtractor].getCanonicalName)
      .option(PARTITIONPATH_FIELD_OPT_KEY, "dt")
      .option(HIVE_PARTITION_FIELDS_OPT_KEY, "ds")
      .option(META_SYNC_ENABLED_OPT_KEY, "true")
      .option(HIVE_USE_JDBC_OPT_KEY, "false")
      .option(HIVE_DATABASE_OPT_KEY, "default")
      .option(HIVE_TABLE_OPT_KEY, "hudi_test_0")
      .option(INSERT_PARALLELISM, "8")
      .option(UPSERT_PARALLELISM, "8")
      .mode(Overwrite)
      .save("/tmp/hudi/h0")

樣本如下。

df.write.format("hudi")
      .option(TABLE_NAME, "hudi_test_0")
      .option(OPERATION_OPT_KEY, DELETE_OPERATION_OPT_VAL) // for delete
      .option(RECORDKEY_FIELD_OPT_KEY, "id")
      .option(PRECOMBINE_FIELD_OPT_KEY, "version")
      .option(KEYGENERATOR_CLASS_OPT_KEY, classOf[SimpleKeyGenerator].getName)
      .option(HIVE_PARTITION_EXTRACTOR_CLASS_OPT_KEY, classOf[MultiPartKeysValueExtractor].getCanonicalName)
      .option(PARTITIONPATH_FIELD_OPT_KEY, "dt")
      .option(DELETE_PARALLELISM, "8")
      .mode(Append)
      .save("/tmp/hudi/h0")