问hadoop cosn工具不改变原来的fs.defaultFS配置即同时可以访问hdfs和cos？

hadoop cosn工具不改变原来的fs.defaultFS配置即同时可以访问hdfs 和 cos,就像访问亚马逊s3那样：

直接通过：hadoop fs -ls -R s3n://path这样访问,目前通过https://cloud.tencent.com/document/product/436/6884进行了配置，没修改fs.defaultFS

通过：hadoop fs -ls -R cosn://bigdata-1251448501/查询报错：

java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.fs.CosFileSystem not found

at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2267)

at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2652)

at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2665)

at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:93)

at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2701)

at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2683)

at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:372)

at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)

at org.apache.hadoop.fs.shell.PathData.expandAsGlob(PathData.java:325)

at org.apache.hadoop.fs.shell.Command.expandArgument(Command.java:235)

at org.apache.hadoop.fs.shell.Command.expandArguments(Command.java:218)

at org.apache.hadoop.fs.shell.Command.processRawArguments(Command.java:201)

at org.apache.hadoop.fs.shell.Command.run(Command.java:165)

at org.apache.hadoop.fs.FsShell.run(FsShell.java:287)

at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)

at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)

at org.apache.hadoop.fs.FsShell.main(FsShell.java:340)

Caused by: java.lang.ClassNotFoundException: Class org.apache.hadoop.fs.CosFileSystem not found

at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2171)

at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2265)

... 16 more