我正在尝试通过EMR使用Amazon s3存储。但是，当我当前运行代码时，出现多个错误，例如
java.lang.IllegalArgumentException: This file system object (hdfs://10.254.37.109:9000) does not support access to the request path 's3n://energydata/input/centers_200_10k_norm.csv' You possibly called FileSystem.get(conf) when you should have called FileSystem.get(uri, conf) to obtain a file system supporting your path.
at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:384)
at org.apache.hadoop.hdfs.DistributedFileSystem.getPathName(DistributedFileSystem.java:129)
at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:154)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:429)
at edu.stanford.cs246.hw2.KMeans$CentroidMapper.setup(KMeans.java:112)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:771)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:375)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1132)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
在main中，我像这样设置输入和输出路径，并将s3n://energydata/input/centers_200_10k_norm.csv放入配置CFILE中，该配置文件是在映射器和化简器中检索的:
FileSystem fs = FileSystem.get(conf);
conf.set(CFILE, inPath); //inPath in this case is s3n://energydata/input/centers_200_10k_norm.csv
FileInputFormat.addInputPath(job, new Path(inputDir));
FileOutputFormat.setOutputPath(job, new Path(outputDir));
在我尝试访问CFILE(s3n://energydata/input/centers_200_10k_norm.csv)的mapper和reducer中发生上述错误的特定示例。这是我尝试获取路径的方法:
FileSystem fs = FileSystem.get(context.getConfiguration());
Path cFile = new Path(context.getConfiguration().get(CFILE));
DataInputStream d = new DataInputStream(fs.open(cFile)); ---->Error
s3n://energydata/input/centers_200_10k_norm.csv是该程序的输入参数之一，当我启动EMR作业时，我将输入和输出目录指定为s3n:// energydata / input和s3n:// energydata /输出
我尝试执行file path in hdfs中建议的操作，但仍然出现错误。任何帮助，将不胜感激。
谢谢!
最佳答案
请尝试:
Path cFile = new Path(context.getConfiguration().get(CFILE));
FileSystem fs = cFile.getFileSystem(context.getConfiguration());
DataInputStream d = new DataInputStream(fs.open(cFile));