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Asked: 2026-05-26T11:13:03+00:00

ultra-noob . I have a server machine with cdh3u1 pseudo-distrib, and a client machine

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ultra-noob. I have a server machine with cdh3u1 pseudo-distrib, and a client machine with a java application using the cdh3u1 API.

How do I configure the client to talk to the server? I’ve been googling for hours and couldn’t find where is the “client configuration” file. The “hdfs-default”, “core-default” and “mapred-default” and their “-site” counterparts all look like server (namenode and datanode) config to me.

Is it just “multipurpose client server” config and I should cherry-pick the attributes in these files that are appropriate to the client? which are they? probably missing something big here…

Thanks, Ido

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  1. Editorial Team

    make sure that the client machine can access the hadoop server machine ip. If you use a virtualbox for the hadoop server (cdh3 vm), then add a “host-only” network interface (see details here: host-only networking with virtualbox. I’m assuming that your static ip for the hadoop server is 192.168.56.101 and that you’re able to ping it from your client.

    configure a hostname for your hadoop server machine in both the server and client machine. If you want to name your hadoop server “local-elephant”, add the following line to /etc/hosts in both machines: 192.168.56.101 local-elephant.

    in the server machine goto /etc/hadoop/conf change the values of the following properties from “localhost” to “local-elephant”: in core-site.xml the value of fs.default.name and in mapred-site.xml the value of mapred.job.tracker.

    in the client machine, create core-site.xml and mapred-site.xml in the classpath of your java application. In those files put only the fs.default.name and mapred.job.tracker properties.

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