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From Shani Ranasinghe <shanir...@gmail.com>
Subject Fwd: HDFS multi-tenancy and federation
Date Mon, 03 Feb 2014 06:44:32 GMT
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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