HDFS Forum

Running external NameNode

  • #50616


    I installed HDP 2 with ambari, now I have got a problem with the NameNode.

    I already had a self set up hadoop v1 cluster (not HDP) where I used an external NameNode.
    I used the parameter “fs.default.name” and added the hdfs:// address., and it worked.

    Now I tried the same thing with ambari and HDP 2, but I did not find a way, to avoid setting up a NameNode, so that I can use my external NN.
    I tried adding the NN address at “fs.defaultFS”, but it does not work.
    The internal NameNode is still started (and fails starting).

    Is there a way to avoid setting up a Namenode for HDP, and include my external one?
    Or what is the normal way to attach external storage, located at a fileserver, to the Namenode with HDP?


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  • Author
  • #50639
    Robert Molina

    Hi Lars,
    For your namenode, you can have multiple mounts so you can have redundancy with the namenode data just in case one fails. You can use an nfs mount on your node where namenode runs hence it can be written to storage outside of the local machine. Ideally, you should also have a local mount to write the fsimage and edits files of the namenode. Also, use soft mount vs. hard mount when doing an nfs mount.


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