Hi, I have made a mistake on the hadoop versions. It is hadoop version 2.2.0. https://hadoop.apache.org/releases.html#15+October%2C+2013%3A+Release+2.2.0+available, this is the latest recommended release.
On Mon, Feb 3, 2014 at 6:23 PM, Shani Ranasinghe <[email protected]> wrote: > Hi, > > Hadoop 2.1.0 release [1] is mentioned to be stable. I suggest we use this > feature for SS future release. > > In hadoop 2, a main feature that is introduced is federation. This is > where there can be multiple namenodes/namespaces per cluster. A namenode > here means a active namenode, a passive namenode and a secondary namenode. > So with this approach, if we dedicate one namenode/namespace per tenant we > can get the tenant isolation. > > As per the discussion I had with Prabath A, and Dhanuka on friday, we had > 2 questions, > > 1) Can there be multiple namespaces in a single namenode? is it > recommended? > > 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 belonging to namespace B1. If not how is it handled? > > IMO this could be handled to some extend with the usage of kerberos in > HDFS. The delegation tokens could be of use in this case. However will need > to look into this more. > > I have raised these questions on the HDFS mailing lists, but have not yet > got any response. > > I am yet to try the Hadoop 2 aforementioned release. Will do a POC and > update. > > [1] Hadoop > 2.1.0-beta<http://hadoop.apache.org/releases.html#23+September%2C+2013%3A+Release+2.1.1-beta+available> > > > Thanks and Regards > *,Shani Ranasinghe* > Software Engineer > WSO2 Inc.; http://wso2.com > lean.enterprise.middleware > > mobile: +94 77 2273555 > linked in: lk.linkedin.com/pub/shani-ranasinghe/34/111/ab > -- Thanks and Regards *,Shani Ranasinghe* Software Engineer WSO2 Inc.; http://wso2.com lean.enterprise.middleware mobile: +94 77 2273555 linked in: lk.linkedin.com/pub/shani-ranasinghe/34/111/ab
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