From: Shashank Date <shanko_date@...>
Date: 2005-07-02T01:45:43+09:00
Subject: Re: Fault Tolerant DRb?

Hi Kirk,

I have written something like this a long time back to build fault tolerant database clusters.
It became pretty messy pretty quick (of course I was not as proficient in Ruby back then ;-)). 
So I have some questions:

--- Kirk Haines <khaines@enigo.com> wrote:
> Assume you are using a DRb service for....something.  It doesn't matter what.  
> The case is the same whether one is accessing an array via DRb or a Rinda 
> Ring.  Is there some reasonably easy way of making a service work in a fault 
> tolerant way?  That is, one could have two processes on two different 
> machines both offering the same service.  If one process dies, the data is 
> still present on the other, 
  ^^^^^^^^^^^^^^^^^^^^^^^^^^
How do you propose to ensure that? Is it on a shared file system (like NFS).
If true, then take a look at Ara's rq package:

  http://www.codeforpeople.com/lib/ruby/rq/rq-2.3.0/TUTORIAL

If false, then think of some "easy" way of replication.

> and the clients of that service can continue 
> operating without data loss?

I had to worry about how the clients who were in the middle of a request would know that the
service is no longer available. 

> 
> Kirk Haines
> 

-- shanko
> 



		
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