- Where's the documentation?
Recall has some interface documentation in the Recall.idl
file, several example servers, and some overview documentation
in the HOWTO. Because it is not a
commercial product, and likely didn't cost you anything to
purchase, we cannot afford to provide detailed documentation.
We would gladly accept donations of documentation, or
sponsorship to produce it.
- How do I use Recall?
See the HOWTO.
- Is anyone else using Recall?
Not that I am aware. I would appreciate any feedback
regarding the usefulness of Recall project, either
positive or negative.
- I just want a primary/secondary server. Must I always
use three machines to tolerate the loss of one machine?
Strictly speaking, no.. The basic algorithm allows for third
parties (simple, cheap systems) to break ties between two main
machines. It also allows a mechanism that will always break
election ties reliably, but this would probably require a
separate (and non-portable) hardware link between the two
As written, the system requires three fully redundant systems
to tolerate a single system failure.
- I want to have replication just like
Can Recall do that?
Short answer: I don't know.
Long answer: replication performance is highly dependent upon
your requirements. Recall aims for replication on stock
hardware using standard message passing with very strict
consistency guarantees, and fast (seconds), transparent
recovery. If your requirements are not this strict, you may
not even need Recall. If you are looking for a very general
approach to replication and fault-tolerance, then you just might.
- Python? You're kidding right?
No, no we're not. Now that all the major interfaces of Recall
are now CORBA based, you can implement the custom client and
server pieces in C/C++/Perl/Tcl/Lisp/Smalltalk/etc if you find
you must. If there are changes we can make to facilitate that
integration, please let us know.
We are open to re-implementation in other languages if we can
be sponsored for the work. For our own work we will use a
mixture of Python and C++.
- What's MetaSlash?
MetaSlash has provided the corporate sponsership for the
Python/CORBA version of Recall.
Meta-Slash (M-/) describes the keyboard short-cut for
dynamically completing your words in the text editor we use
(Emacs). It's a metaphor for our business model. We
supplement in-house development and provide dynamic completion
of works in progress. We take on projects on a out-sourced
basis at a fixed price, and then provide (optional) training
and re-integration of the resulting system back for in-house