Hi, Thanks for the information.
Can I have an answer for the question 2 please? Appreciate any help. On Wed, Feb 5, 2014 at 1:41 PM, praveenesh kumar <praveen...@gmail.com> wrote: > 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. >>> >>> >>> >>> >> >
