Hi Praveenesh, Thank you for pointing this out. Will go through this.
On Tue, Jul 15, 2014 at 3:36 PM, praveenesh kumar <praveen...@gmail.com> wrote: > Federation is just a namenode namespace management capability. It is > designed to control namenode management and to provide scalability for > namenode. I don't think it poses any security or restrictions on accesssing > the HDFS filesystem. I guess this link would help for your question 2 - > http://hadoop.apache.org/docs/r2.4.0/hadoop-project-dist/hadoop-hdfs/ViewFs.html > > > > > > On Tue, Jul 15, 2014 at 10:06 AM, Shani Ranasinghe <shanir...@gmail.com> > wrote: > >> 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. >>>>> >>>>> >>>>> >>>>> >>>> >>> >> >
