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Why MapR dfs is better than HDFS?

Question asked by xxqonline on Jul 17, 2011
Latest reply on Jul 18, 2011 by srivas
Hello guys:
      I have read [mcsrivas ppt][1], it compare the namenode implementation between HDFS and MapR.
    I still do not understand why disttributed name node is better than the central one.
    Where can I get all file information? Let client query each namenode?
    In slides 14, seems it is.
    Is there sample code for file sytem query?