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Hortonworks Sandbox Forum

NameNode metadata service

  • #17885
    Artem Arapov

    I’m trying to load some data from Sandbox, but keep getting error “sandbox/ Connection refused”. Tried to restart Sandbox and namenode service several times, but “telnet 8020” saying “connection refused”.
    Has anyone had this issue?

  • Author
  • #17892
    Seth Lyubich

    Hi Artem,

    Can you please clarify how you are connecting to sandbox address Do you have hadoop client installed somewhere else? In general this error looks like firewall or network issue.


    Artem Arapov

    Hi Seth,
    I have an Aster Express VM in the same network. I can obtain metadata from Sandbox via WebHCat Server (port 50111), but unable to load data.

    Larry Liu

    Hi, Artem

    Is your Aster Espress VM up running? If it is, can you try to turn it off and try again?


    Artem Arapov

    i found out that namenode listened port 8020 on ip-address that belongs “host-only” VM network adapter. But connection with Aster was set up on another VM adapter (“NAT”), since sandbox has 2 of them by default. Switching connection to the host-only network resolved the issue and now it seems working fine. But it’s not a nice solution, it would be better to switch listener to desired ip-address. Does anyone know how to do that? Like command or config file?

    Thanks for your help.

    Larry Liu

    Hi, Artem

    I did some test that my other VM running on NAT can’t talk to NAT ip on sandbox. But it can talk to the host-only interface.

    I think this is how VM works.


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