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From Elazar Leibovich <elaz...@gmail.com>
Subject Re: hadoop security
Date Fri, 22 Nov 2013 06:33:02 GMT
The reason you must use jsvc, is to start as root and then bind to
privilleged ports. Secure Datanode won't run on non privilleged port (i.e.
>1024).

The advantages are, users on your machine cannot take this port and pretend
they're DN. Only root can.

Like you, I don't think this should be mandatory, but it is now.


On Mon, Nov 18, 2013 at 11:42 AM, lei liu <liulei412@gmail.com> wrote:

> When I use the hadoop security, I must use jsvc to start datanode. Why
> must use jsvc to start datanode? What are the advantages do that?
>
> Thanks,
>
> LiuLei
>

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