gen leader

Thomas Arts <>
Thu May 6 10:59:19 CEST 2004


Hi Bengt

> fwiw: gen_leader is supposed to add safety be beeing redundant.  
> currently we know that a successfull selection of a leader assures 
> redundancy. if/when a single leader is also successfull, it will then be 
> neccessary to find out if there is more than one node.

I liked your reasoning, but I am not sure this claim holds. If you give
an existing and a non-existing node name, a leader will be selected.
However, there is no redundancy!
I would like the gen_leader to be changed such that your claim is
tru, since I think it is a really important observation. An observation
I haven't thought of before. It is not part of the algorithm, but should
be ensured from outside.

Since the assurance of the redundancy comes partly from outside
the algorithm it is possible to combine that claim with the wish to
be able to test with one node. Just ensure that the redundancy is
only guaranteed for two nodes and more. The one node case is
then a special case.

Cheers
Thomas


---
Dr Thomas Arts 
     Program Manager 
     Software Engineering and Management 
IT-university in Gothenburg 
Box 8718, 402 75 Gothenburg, Sweden 
http://www.ituniv.se/

Tel +46 31 772 6031 
Fax +46 31 772 4899 






More information about the erlang-questions mailing list