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From Shani Ranasinghe <shanir...@gmail.com>
Subject Re: HDFS multi-tenancy and federation
Date Wed, 05 Feb 2014 08:05:05 GMT

Any help on this please?

On Mon, Feb 3, 2014 at 12:14 PM, Shani Ranasinghe <shanira14@gmail.com>wrote:

> Hi,
> I would like to know the following.
> 1) Can there be multiple namespaces in a single namenode? is it
> recommended?  (I'm having a multi-tenant environment in mind)
> 2) Let's say I have a federated namespace/namenodes. There are two
> namenodes A /namespace A1 and namenode B/namespace B1, and have 3
> datanodes. Can someone from namespace A1,  access the datanode's data in
> anyway (hacking) belonging to namespace B1. If not how is it handled?
> After going through a lot  of reference, my understanding on HDFS
> multi-tenancy and federation is that for multi-tenancy what we could do is
> use file/folder permissions (u,g,o) and ACL's. Or we could dedicate a
> namespace per tenant. The issue here is that a namenode (active namenode,
> passive namenode and secondary namenode) has to be assigned per tenant.  Is
> there any other way that multi tenancy can be achieved?
> On federation, let's say I have a namenode for /marketing and another for
> /finance. Lets say that marketing bears the most load. How can we load
> balance this? is it possible?
> Appreciate any help on this.
> Regards,
> Shani.

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