我正在尝试使用spark3.0.0（通过scala2.12.10实现）对我设置的s3存储桶进行简单的读取。但是，我在提交脚本时收到以下错误：

No AWS Credentials provided by BasicAWSCredentialsProvider EnvironmentVariableCredentialsProvider InstanceProfileCredentialsProvider : com.amazonaws.SdkClientException: Unable to load credentials from service endpoint: No AWS Credentials provided by BasicAWSCredentialsProvider EnvironmentVariableCredentialsProvider InstanceProfileCredentialsProvider : 

com.amazonaws.SdkClientException: Unable to load credentials from service endpoint

我正在实现当前的spark脚本：

package org.knd

import scala.util.Properties
import org.apache.spark.{SparkConf, SparkContext}
import org.apache.spark.sql.{SparkSession, SQLContext}
import io.delta.tables._
import org.apache.spark.sql.functions._

object App {

  def main(args: Array[String]) : Unit = {

    val spark = SparkSession
      .builder()
      .appName("covid-delta-lake")
      .master("local")
      .config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
      .config("spark.sql.catalog.spark_catalog", "org.apache.spark.sql.delta.catalog.DeltaCatalog")
      .getOrCreate()

    val aws_access_key = scala.util.Properties.envOrElse("AWS_ACCESS_KEY", "notAvailable" )
    val aws_secret = scala.util.Properties.envOrElse("AWS_SECRET_ACCESS_KEY_ID", "notAvailable" )

    spark.sparkContext.hadoopConfiguration.set("fs.s3a.awsAccessKeyId", aws_access_key)
    spark.sparkContext.hadoopConfiguration.set("fs.s3a.awsSecretAccessKey", aws_secret)
    spark.sparkContext.hadoopConfiguration.set("fs.s3a.endpoint", "s3.amazonaws.com")

    print("\n" + "====================HERE====================" + "\n")

    val data = spark.read.parquet("s3a://[url-to-my-s3]/*.parquet")
    data.show(10)

  }

}

我已经仔细检查了我的aws密钥和s3url，所以我确信这些不是问题所在。我试过从其他桶读取数据，但收到了相同的错误。我已将我的pom文件包括在下面：

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.knd</groupId>
  <artifactId>delta-lake-scala</artifactId>
  <version>1.0-SNAPSHOT</version>
  <inceptionYear>2020</inceptionYear>
  <properties>
    <scala.version>2.12.10</scala.version>
  </properties>

  <repositories>
    <repository>
      <id>scala-tools.org</id>
      <name>Scala-Tools Maven2 Repository</name>
      <url>http://scala-tools.org/repo-releases</url>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>scala-tools.org</id>
      <name>Scala-Tools Maven2 Repository</name>
      <url>http://scala-tools.org/repo-releases</url>
    </pluginRepository>
  </pluginRepositories>

  <dependencies>

    <dependency>
      <groupId>org.scala-lang</groupId>
      <artifactId>scala-library</artifactId>
      <version>${scala.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-core_2.12</artifactId>
      <version>3.0.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-sql -->
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-sql_2.12</artifactId>
      <version>3.0.0</version>
    </dependency>
    <dependency>
      <groupId>io.delta</groupId>
      <artifactId>delta-core_2.12</artifactId>
      <version>0.7.0</version>
    </dependency>
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-common</artifactId>
      <version>3.0.0</version>
    </dependency>
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-client</artifactId>
      <version>3.0.0</version>
    </dependency>
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-aws</artifactId>
      <version>3.0.0</version>
    </dependency>
  </dependencies>

  <build>
    <sourceDirectory>src/main/scala</sourceDirectory>
    <testSourceDirectory>src/test/scala</testSourceDirectory>
    <plugins>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-eclipse-plugin</artifactId>
        <configuration>
          <downloadSources>true</downloadSources>
          <buildcommands>
            <buildcommand>ch.epfl.lamp.sdt.core.scalabuilder</buildcommand>
          </buildcommands>
          <additionalProjectnatures>
            <projectnature>ch.epfl.lamp.sdt.core.scalanature</projectnature>
          </additionalProjectnatures>
          <classpathContainers>
            <classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</classpathContainer>
            <classpathContainer>ch.epfl.lamp.sdt.launching.SCALA_CONTAINER</classpathContainer>
          </classpathContainers>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <reporting>
    <plugins>

    </plugins>
  </reporting>
</project>