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  Allen Wittenauer commented on HDFS-1499:
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  What do you store the hbase files in then?
  > mv the namenode NameSpace and BlocksMap to hbase to save the namenode memory
  > ----------------------------------------------------------------------------
  >
  > Key: HDFS-1499
  > URL:
  > Project: Hadoop HDFS
  > Issue Type: Improvement
  > Components: name-node
  > Reporter: dl.brain.ln
  >
  > The NameNode stores all its metadata in the main memory of the machine on which it is
  deployed. With the file-count and block number growing, namenode machine can't hold anymore
  files and blocks in its memory and thus restrict the HDFS cluster growth. So many people are
  talking and thinking abont this problem. Google's next version of GFS use bigtable to store
  the metadata of the DFS and that seem works. What if we use hbase as the same?
  > In the namenode structure, the namespace of the filesystem and the map of block ->
  datanodes, datanode->blocks which keeped in memory are consume most of the namenode's heap,
  what if we store those data structure in hbase to decrease the namenode's memory?
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