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From praveenesh kumar <praveen...@gmail.com>
Subject Re: HDFS multi-tenancy and federation
Date Wed, 05 Feb 2014 08:11:22 GMT
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 <shanira14@gmail.com>wrote:

> Hi,
>
> 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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