星火无法读取本地文件

Question

我有所有Spark节点上可用在EMR集群下列权限的本地文件：

-rw-rw---- 1 test_user test_group 30 Jun 21 14:20 /tmp/foo_test 

我运行集群ec2-user，使用纱调度。为了使Spark/Yarn能够访问文件，我在所有节点上添加了test_group作为yarn用户的辅助组。

$ sudo -u yarn groups 
    yarn hadoop test_group 

在火花外壳，我得到以下错误读取文件：

scala> val rdd = sc.textFile("file:///tmp/foo_test") 
    org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 4 times, most recent failure: Lost task 0.3 in stage 0.0: 
java.io.FileNotFoundException: /tmp/foo_test (Permission denied) 
    at java.io.FileInputStream.open(Native Method) 
    at java.io.FileInputStream.<init>(FileInputStream.java:146) 
    at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileInputStream.<init>(RawLocalFileSystem.java:111) 
    at org.apache.hadoop.fs.RawLocalFileSystem.open(RawLocalFileSystem.java:207) 
    at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.<init>(ChecksumFileSystem.java:141) 
    at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:341) 
    at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:771) 
    at org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:109) 
    at org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:67) 
    at org.apache.spark.rdd.HadoopRDD$$anon$1.<init>(HadoopRDD.scala:237) 
    at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:208) 
    at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:101) 
    at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306) 
    at org.apache.spark.rdd.RDD.iterator(RDD.scala:270) 
    at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38) 
    at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306) 
    at org.apache.spark.rdd.RDD.iterator(RDD.scala:270) 
    at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66) 
    at org.apache.spark.scheduler.Task.run(Task.scala:89) 
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214) 
    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) 

如何阅读与EMR星火组级权限的文件吗？

Answer 1

将权限更改为770 - 即chmod -R 770 /tmp并重试。