SparkContext addFile cause FileNotFoundException

Question

我想用sparkContext.addFile方法將大文件傳遞給每個執行器。這個大文件的

來源是亞馬遜S3（注：在源的情況下是HDFS一切正常）

val context = stream.context.sparkContext 
context.addFile("s3n://bucket-name/file-path") 
... 
SparkFiles.get(file-name) 

這是一個錯誤的原因：

java.io.FileNotFoundException: File s3n://bucket-name/file-path does not exist. 
    at com.amazon.ws.emr.hadoop.fs.s3n.S3NativeFileSystem.listStatus(S3NativeFileSystem.java:945) 
    at com.amazon.ws.emr.hadoop.fs.s3n.S3NativeFileSystem.listStatus(S3NativeFileSystem.java:887) 
    at com.amazon.ws.emr.hadoop.fs.EmrFileSystem.listStatus(EmrFileSystem.java:343) 
    at org.apache.spark.util.Utils$.fetchHcfsFile(Utils.scala:596) 
    at org.apache.spark.util.Utils$.doFetchFile(Utils.scala:566) 
    at org.apache.spark.util.Utils$.fetchFile(Utils.scala:356) 
    at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$3.apply(Executor.scala:393) 
    at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$3.apply(Executor.scala:390) 
    at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772) 
    at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98) 
    at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98) 
    at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226) 
    at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39) 
    at scala.collection.mutable.HashMap.foreach(HashMap.scala:98) 
    at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771) 
    at org.apache.spark.executor.Executor.org$apache$spark$executor$Executor$$updateDependencies(Executor.scala:390) 
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:193) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at java.lang.Thread.run(Thread.java:745) 

但當我做「fs -ls」時，文件可訪問

hadoop fs -ls s3n://bucket-name/file-path 

可能是什麼原因？

PS：Spark版本：1.5.2

Answer 1

突然之間，這是憑證問題。 當我將s3 URL更改爲

s3n://accessKey:secretKey@backet-name/path 

問題已解決。