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log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.IllegalArgumentException: Wrong FS: hdfs://sandbox.hortonworks.com:8020/user/testdir, expected: file:///
at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:645)
at org.apache.hadoop.fs.RawLocalFileSystem.pathToFile(RawLocalFileSystem.java:80)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:423)
at org.apache.hadoop.fs.ChecksumFileSystem.mkdirs(ChecksumFileSystem.java:590)
at com.hdfs.directory.CreateDir.main(CreateDir.java:19)
在本机运行是会出现上面的错误，改成下面的代码：
package com.hdfs.directory; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; public class CreateDir { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub Configuration conf=new Configuration(); Path newPath = new Path("hdfs://sandbox.hortonworks.com:8020/user/testdir"); //FileSystem fs=FileSystem.get(conf); FileSystem fs = newPath.getFileSystem(conf); fs.mkdirs(newPath); fs.close(); // FileStatus fileStatus=fs.getFileStatus(new Path("/user/long1657/20130908")); } }
或者hadoop相关的配置信息，放在工程目录下：
执行上面的代码后：/user/testdir目录被成功删除:
在将hadoop相关的配置文件添加到工程中后，用下面的代码就可以成功创建文件夹：
package com.hdfs.directory; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; public class CreateDirWithConf { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub Configuration conf=new Configuration(); FileSystem fs=FileSystem.get(conf); fs.mkdirs(new Path("hdfs://sandbox.hortonworks.com:8020/user/testdir")); fs.close(); // FileStatus fileStatus=fs.getFileStatus(new Path("/user/long1657/20130908")); } }
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原文地址：http://www.cnblogs.com/justinzhang/p/4844137.html
