我有一個公共可用的Amazon s3資源(文本文件)並希望從spark中訪問它。這意味着 - 我沒有任何憑據亞馬遜 - 它工作得很好,如果我想只要下載:從Apache Spark訪問公共可用的Amazon S3文件
val bucket = "<my-bucket>"
val key = "<my-key>"
val client = new AmazonS3Client
val o = client.getObject(bucket, key)
val content = o.getObjectContent // <= can be read and used as input stream
然而,當我嘗試從火花背景
val conf = new SparkConf().setAppName("app").setMaster("local")
val sc = new SparkContext(conf)
val f = sc.textFile(s"s3a://$bucket/$key")
println(f.count())
訪問同一資源我收到堆棧跟蹤以下錯誤:
Exception in thread "main" com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
at com.amazonaws.auth.AWSCredentialsProviderChain.getCredentials(AWSCredentialsProviderChain.java:117)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3521)
at com.amazonaws.services.s3.AmazonS3Client.headBucket(AmazonS3Client.java:1031)
at com.amazonaws.services.s3.AmazonS3Client.doesBucketExist(AmazonS3Client.java:994)
at org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:297)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2653)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:92)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2687)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2669)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:371)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:221)
at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:270)
at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:207)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:217)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:217)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:32)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:217)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:217)
at org.apache.spark.SparkContext.runJob(SparkContext.scala:1781)
at org.apache.spark.rdd.RDD.count(RDD.scala:1099)
at com.example.Main$.main(Main.scala:14)
at com.example.Main.main(Main.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
我不想提供任何AWS憑據 - 我只是想訪問資源匿名(現在) - 如何實現這一目標?我可能需要使它像AnonymousAWSCredentialsProvider - 但如何把它放在火花或hadoop?
P.S.我的build.sbt以防萬一
scalaVersion := "2.11.7"
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % "1.4.1",
"org.apache.hadoop" % "hadoop-aws" % "2.7.1"
)
更新:我做了一些調查後 - 我看到了它爲什麼沒有工作的原因。
首先,S3AFileSystem創建AWS客戶端憑證的順序如下:
AWSCredentialsProviderChain credentials = new AWSCredentialsProviderChain(
new BasicAWSCredentialsProvider(accessKey, secretKey),
new InstanceProfileCredentialsProvider(),
new AnonymousAWSCredentialsProvider()
);
「ACCESSKEY」和「祕密密鑰」值從火花的conf例如採取(密鑰必須「fs.s3a。 access.key「和」fs.s3a.secret.key「org.apache.hadoop.fs.s3a.Constants.ACCESS_KEY和org.apache.hadoop.fs.s3a.Constants.SECRET_KEY常量,這樣更方便)。
其次 - 您可能會看到AnonymousAWSCredentialsProvider是第三個選項(最後優先級) - 可能會出現什麼錯誤?請參見AnonymousAWSCredentials的實現:
public class AnonymousAWSCredentials implements AWSCredentials {
public String getAWSAccessKeyId() {
return null;
}
public String getAWSSecretKey() {
return null;
}
}
它對訪問密鑰和密鑰都只是返回null。聽起來很合理。但是,看看裏面AWSCredentialsProviderChain:
AWSCredentials credentials = provider.getCredentials();
if (credentials.getAWSAccessKeyId() != null &&
credentials.getAWSSecretKey() != null) {
log.debug("Loading credentials from " + provider.toString());
lastUsedProvider = provider;
return credentials;
}
它不選擇供應商的情況下,兩個鍵是空 - 這意味着匿名憑據不能工作。看起來像aws-java-sdk-1.7.4中的一個bug。我試圖使用最新版本 - 但它與hadoop-aws-2.7.1不兼容。
還有其他想法嗎?
你有過任何成功,可能與最近的版本提供共享? –
不,我沒有嘗試這一段時間 - 我甚至忘了它,不要使用亞馬遜s3的任何東西 – pkozlov