Cloudera快速入门VM illegalargumementexception: Wrong FS: hdfs: e

Question

我有一个简单的java代码复制文本文件从我的本地到hdfs。我正在使用cloudera的快速入门虚拟机。

Configuration conf = new Configuration();
conf.addResource(new Path("/etc/hadoop/conf/core-site.xml"));
conf.addResource(new Path("/etc/hadoop/conf/hdfs-site.xml"));
FileSystem fs = FileSystem.get(conf);
fs.copyFromLocalFile(new Path("/home/cloudera/workspace/Downloader/output/data.txt"), 
                          new Path("hdfs://quickstart.cloudera:8020/user/cloudera/"));

我得到这个错误后运行这段代码:

Exception in thread "main" java.lang.IllegalArgumentException: Wrong FS: hdfs://quickstart.cloudera:8020/user/cloudera, expected: file:///
at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:381)
at org.apache.hadoop.fs.RawLocalFileSystem.pathToFile(RawLocalFileSystem.java:55)
at org.apache.hadoop.fs.LocalFileSystem.pathToFile(LocalFileSystem.java:61)
at org.apache.hadoop.fs.LocalFileSystem.exists(LocalFileSystem.java:51)
at org.apache.hadoop.fs.FileUtil.checkDest(FileUtil.java:355)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:211)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:163)
at org.apache.hadoop.fs.LocalFileSystem.copyFromLocalFile(LocalFileSystem.java:67)
at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:1143)

我做错了什么?

Answer 1

我解决了这个问题。您必须小心添加到类路径中的jar文件类型，特别是在使用cloudera quickstart vm时。如果可以，使用cloudera提供的jar文件。它们可以在这个文件夹中找到:/usr/lib/hadoop/client/这段代码将正常工作，没有任何问题。

Configuration conf = new Configuration();
conf.addResource(new Path("/etc/hadoop/conf/core-site.xml"));
conf.addResource(new Path("/etc/hadoop/conf/hdfs-site.xml"));
FileSystem fs = FileSystem.get(conf);
fs.copyFromLocalFile(new Path("/home/cloudera/workspace/Downloader/output/data.txt"), 
                      new Path("hdfs://quickstart.cloudera:8020/user/cloudera/"));

Answer 2

不正确的路径("hdfs://快速启动。Cloudera:8020/user/Cloudera/"使用以下示例:

Configuration conf = getConf();
System.out.println("fs.default.name : - " + conf.get("fs.default.name"));
// It prints uri  as : hdfs://10.214.15.165:9000 or something...
String uri = conf.get("fs.default.name");
FileSystem fs = FileSystem.get(uri,getConf());