scala - 包部署中的对象 SparkHadoopUtil 无法在包 org.apache.spark.deploy 中访问

Question

为什么 SparkHadoopUtil 在此处无法访问，而在较低版本的 spark 中即使已导入也可以访问？

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Using Scala version 2.12.10 (OpenJDK 64-Bit Server VM, Java 1.8.0_282)
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scala> import org.apache.spark.deploy.SparkHadoopUtil
import org.apache.spark.deploy.SparkHadoopUtil

scala> import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.conf.Configuration

scala> 

scala> 

scala>  val hadoopConf: Configuration = SparkHadoopUtil.get.conf
<console>:25: error: object SparkHadoopUtil in package deploy cannot be accessed in package org.apache.spark.deploy
        val hadoopConf: Configuration = SparkHadoopUtil.get.conf
                                        ^

scala> 

Answer 1

那是因为SparkHadoopUtil在 Spark 3 中该类已更改为私有类。这里是Spark 2.4和Spark 3.0的源之间的区别。

火花 2.4：

@DeveloperApi
class SparkHadoopUtil extends Logging {

火花 3.0：

private[spark] class SparkHadoopUtil extends Logging {