HDP on Linux – Installation Forum

Can I start without secondary namenode (with Ambari)?

  • #44515
    Lebing XIE
    Member

    Hello,

    Currently we have 4 servers and have to start 1NN+3DN or 2NN + 2DN. As I install with Ambari, I can’t deselect 2nd Namenode. Which option is better? start with 2NN or 2DN? In case 2DN, should I set the replica to 2? Thank you!

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  • #44524
    Kenny Zhang
    Moderator

    Hi Lebing,

    With secondary Namenode, your cluster will be more robust. You restore the namenode image and edits log from secondary namenode if necessary. FYI, 2nd namenode and DN can runs on the same node, so you can start with 1NN + 2nd namenode + 3 DN on a 4 nodes cluster.

    Hope this helps.

    Thanks,
    Kenny

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