把eclipse中的hadoop项目,换了一个工作空间,再次启动任务时,发现报如下异常:
- java.io.IOException: No FileSystem for scheme: hdfs
- at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2421)
- at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2428)
- at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:88)
- at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2467)
- at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2449)
- at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367)
- at FileCopyToHdfs.readFromHdfs(FileCopyToHdfs.java:65)
- at FileCopyToHdfs.main(FileCopyToHdfs.java:26)
java.io.IOException: No FileSystem for scheme: hdfs at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2421) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2428) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:88) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2467) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2449) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367) at FileCopyToHdfs.readFromHdfs(FileCopyToHdfs.java:65) at FileCopyToHdfs.main(FileCopyToHdfs.java:26)原因一般是,少导入hadoop-hdfs.jar这个jar包, 导入该包后,重新ant编译,提交任务,运行正常!