Dear Harsh, Thanks for your prompt reply, I just try the command line way, but it seems doesn't work si...@nn1 $ hadoop dfs -ls "hdfs://nn2:/user/simon" ls: For input string: "" Usage: java FsShell [-ls <path>] even if I remove the ditto, the error is the same
I would try multiple filesystem object way latter, Anyway, million thank you's, Harsh Best Regards, 瑞興 2011/1/12 Harsh J <qwertyman...@gmail.com> > You can create multiple FileSystem objects, for different URIs and use > them to query specific NNs code-wise. > > From command-line, a simple tricks like `u...@nn1 $ hadoop dfs -ls > hdfs://nn2/dir` should work (i.e. pass entire URI of the path you're > looking for). > > See this exact method for the code question: > > http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/fs/FileSystem.html#get(java.net.URI > , > org.apache.hadoop.conf.Configuration, java.lang.String) > > On Wed, Jan 12, 2011 at 1:06 AM, simon <randyh...@gmail.com> wrote: > > Dear all, > > I want to know if their is any class or any way to access the file list > and > > meta data from a remote HDFS namenode. > > for example, there are two hadoop instances, which mean two namenodes > (nn1 > > and nn2) > > If I was super user in both two hadoop instances, > > and now I am in nn1, want to get nn2's file list and meta data > > Is there any way to get that? > > Now I could just try the most traditional way, which is > > si...@nn1:~$ ssh nn2 "/hadoop/bin/hadoop fs -lsr " > > and then parse the result to get each file's meta data > > Is there any class or api I could use with? > > My dream way is to make my own jar in nn1, through bin/hadoop jar > remote.jar > > remote > > I can get certain directory inform of remote hdfs > > thanks a lot > > Best Regards, > > Simon > > > > > > -- > Harsh J > www.harshj.com >
