The Hortonworks Community Connection is now live. A completely rebuilt Q&A forum, Knowledge Base, Code Hub and more, backed by the experts in the industry.

You will be redirected here in 10 seconds. If your are not redirected, click here to visit the new site.

The legacy Hortonworks Forum is now closed. You can view a read-only version of the former site by clicking here. The site will be taken offline on January 31,2016

Hortonworks Sandbox Forum

NameNode metadata service

  • #17885
    Artem Arapov
    Member

    I’m trying to load some data from Sandbox, but keep getting error “sandbox/192.168.100.128:8020 Connection refused”. Tried to restart Sandbox and namenode service several times, but “telnet 192.168.100.128 8020” saying “connection refused”.
    Has anyone had this issue?

  • Author
    Replies
  • #17892
    Seth Lyubich
    Moderator

    Hi Artem,

    Can you please clarify how you are connecting to sandbox address 192.168.100.128:8020? Do you have hadoop client installed somewhere else? In general this error looks like firewall or network issue.

    Thanks,
    Seth

    #18033
    Artem Arapov
    Member

    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.

    #18110
    Larry Liu
    Moderator

    Hi, Artem

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

    Larry

    #18139
    Artem Arapov
    Member

    Greetings,
    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.

    #18145
    Larry Liu
    Moderator

    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.

    Larry

The forum ‘Hortonworks Sandbox’ is closed to new topics and replies.

Support from the Experts

A HDP Support Subscription connects you experts with deep experience running Apache Hadoop in production, at-scale on the most demanding workloads.

Enterprise Support »

Become HDP Certified

Real world training designed by the core architects of Hadoop. Scenario-based training courses are available in-classroom or online from anywhere in the world

Training »

Hortonworks Data Platform
The Hortonworks Data Platform is a 100% open source distribution of Apache Hadoop that is truly enterprise grade having been built, tested and hardened with enterprise rigor.
Get started with Sandbox
Hortonworks Sandbox is a self-contained virtual machine with Apache Hadoop pre-configured alongside a set of hands-on, step-by-step Hadoop tutorials.
Modern Data Architecture
Tackle the challenges of big data. Hadoop integrates with existing EDW, RDBMS and MPP systems to deliver lower cost, higher capacity infrastructure.