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From Michael Segel <michael_se...@hotmail.com>
Subject Re: Dual Hadoop/HBase configuration through same client
Date Sun, 28 Apr 2013 02:35:27 GMT
This was answered on the linkedIn HBase discussion group. 

Create two configuration instances and then have each one point to the cluster you want to
connect to. 

Then when you create an instance of HTable you use the correct configuration. 



On Apr 27, 2013, at 12:20 AM, Shahab Yunus <shahab.yunus@gmail.com> wrote:

> Thanks Ted for the response. But the issue is that I want to read from one
> cluster and write to another. If I will have to clients then how will they
> communicate with each other? Essentially what am I trying to do here is
> intra-cluster data copy/exchange. Any other ideas or suggestions? Even if
> both servers have no security or one has Kerberos or both have
> authentication how to exchange data between them?
> I was actually not expecting that I cannot load multiple Hadoop or HBase
> configurations in 2 different Configuration objects in one application.
> As mentioned I have tried overwriting properties as well but
> security/authentication properties are overwritten somehow.
> Regards,
> Shahab
> On Fri, Apr 26, 2013 at 7:43 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>> Looks like the easiest solution is to use separate clients, one for each
>> cluster you want to connect to.
>> Cheers
>> On Sat, Apr 27, 2013 at 6:51 AM, Shahab Yunus <shahab.yunus@gmail.com
>>> wrote:
>>> Hello,
>>> This is a follow-up to my previous post a few days back. I am trying to
>>> connect to 2 different Hadoop clusters' setups through a same client but
>> I
>>> am running into the issue that the config of one overwrites the other.
>>> The scenario is that I want to read data from an HBase table from one
>>> cluster and write it as a file on HDFS on the other. Individually, if I
>> try
>>> to write to them they both work but when I try this through a same Java
>>> client, they fail.
>>> I have tried loading the core-site.xml through addResource method of the
>>> Configuration class but only the first found config file is picked? I
>> have
>>> also tried by renaming the config files and then adding them as a
>> resource
>>> (again through the addResource method).
>>> The situation is compounded by the fact that one cluster is using
>> Kerberos
>>> authentication and the other is not? If the Kerberos server's file is
>> found
>>> first then authentication failures are faced for the other server when
>>> Hadoop tries to find client authentication information. If the 'simple'
>>> cluster's config is loaded first then 'Authentication is Required' error
>> is
>>> encountered against the Kerberos server.
>>> I will gladly provide more information. Is it even possible even if let
>> us
>>> say both servers have same security configuration or none? Any ideas?
>>> Thanks a million.
>>> Regards,
>>> Shahab

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