Hi Shani, I haven't done any implementation on HDFS federation, but as far as I know, 1 namenode can handle only 1 namespace at this time. I hope that helps.
Regards Prav On Wed, Feb 5, 2014 at 8:05 AM, Shani Ranasinghe <shanir...@gmail.com>wrote: > Hi, > > Any help on this please? > > > > On Mon, Feb 3, 2014 at 12:14 PM, Shani Ranasinghe <shanir...@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. >> >> >> >> >
