0

我正在尝试将 Amazon s3 存储与 EMR 一起使用。但是,当我当前运行我的代码时,我会遇到多个错误,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 放在配置 CFILE 中,并在映射器和减速器中检索:

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) 的映射器和减速器中发生上述错误的具体示例。这就是我尝试获取路径的方式:

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

我尝试按照 hdfs 文件路径中的建议进行操作,但仍然出现错误。任何帮助,将不胜感激。

谢谢!

4

2 回答 2

3

改为尝试:

Path cFile = new Path(context.getConfiguration().get(CFILE));
FileSystem fs = cFile.getFileSystem(context.getConfiguration());
DataInputStream d = new DataInputStream(fs.open(cFile));
于 2013-04-29T11:55:41.583 回答
2

谢谢。我实际上使用以下代码修复了它:

String uriStr =  "s3n://energydata/centroid/";
URI uri = URI.create(uriStr);
FileSystem fs = FileSystem.get(uri, context.getConfiguration());    
Path cFile = new Path(context.getConfiguration().get(CFILE));  
DataInputStream d = new DataInputStream(fs.open(cFile));
于 2013-04-29T16:40:10.667 回答