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
