Request for DSA Tutorials & Advice

Request for DSA Tutorials & Advice

[Shark8]

I have a small project which I would like to use the DSA for -- the general functionality is simple: a database distributed over various servers. (The project is an implementation of MUMPS; which means the 'heart' of the project is a database implemented as a B-Tree distributed over multiple servers.)

I know that the DSA can do this, and I would like to know how, but I have no experience with the DSA. Also, and this I'm unsure of, can a DSA application add/remove [storage] nodes dynamically? (If so, "hot-swapably"?) -- Such a facility would be a great boon to horizontal scaling.

If successful, this project will be quite useful to the MUMPS community (as a full-Ada implementation would be quite portable) -- but it could also help the Ada community because MUMPS is _THE_ backend language for [electronic] medical records (certainly within the VA) and an Ada implementation could provide for some good Ada interop into the system. (Thus getting Ada's toe in the door for non-embedded/non-device medical applications.)

-----
I'll post a gethub link to the project once I get a bit more info and a bit more fleshed out architecturally.

Re: Request for DSA Tutorials & Advice

[Jeffrey R. Carter]

On 01/16/2018 04:43 PM, Shark8 wrote:
> 
> I know that the DSA can do this, and I would like to know how, but I have no experience with the DSA. Also, and this I'm unsure of, can a DSA application add/remove [storage] nodes dynamically? (If so, "hot-swapably"?) -- Such a facility would be a great boon to horizontal scaling.

The one DSA system I worked on did this.

-- 
Jeff Carter
"If I could find a sheriff who so offends the citizens of Rock
Ridge that his very appearance would drive them out of town ...
but where would I find such a man? Why am I asking you?"
Blazing Saddles
37

Re: Request for DSA Tutorials & Advice

[Shark8]

On Tuesday, January 16, 2018 at 10:09:14 AM UTC-7, Jeffrey R. Carter wrote:
> On 01/16/2018 04:43 PM, Shark8 wrote:
> > 
> > I know that the DSA can do this, and I would like to know how, but I have no experience with the DSA. Also, and this I'm unsure of, can a DSA application add/remove [storage] nodes dynamically? (If so, "hot-swapably"?) -- Such a facility would be a great boon to horizontal scaling.
> 
> The one DSA system I worked on did this.

Awesome, now I know it's possible.

You wouldn't happen to have the source available? Or any tips/hints?

Re: Request for DSA Tutorials & Advice

[Jeffrey R. Carter]

On 01/16/2018 06:16 PM, Shark8 wrote:
> 
> You wouldn't happen to have the source available? Or any tips/hints?

I don't have the source. It's proprietary, so if I did, I couldn't share it with 
you anyway. David Botton did most of the implementation of the DSA part. I wrote 
code that communicated through it. We had a main program and 2 kinds of 
partitions, with multiple instances of the partitions. When a partition instance 
became active, it would register with the main program. The main program kept 
track of the active partitions and tried to balance the work across them.

Sorry I can't be more helpful. Maybe Botton could be.

-- 
Jeff Carter
"If I could find a sheriff who so offends the citizens of Rock
Ridge that his very appearance would drive them out of town ...
but where would I find such a man? Why am I asking you?"
Blazing Saddles
37

Re: Request for DSA Tutorials & Advice

[Shark8]

On Tuesday, January 16, 2018 at 12:14:59 PM UTC-7, Jeffrey R. Carter wrote:
> 
> Sorry I can't be more helpful. Maybe Botton could be.

Oh no, you've been quite helpful; the description alone you gave is most informative. (But I'll certainly keep an eye out for David Botton.)

Thank you very much!

Re: Request for DSA Tutorials & Advice

[Jeffrey R. Carter]

On 01/16/2018 09:15 PM, Shark8 wrote:
> 
> (But I'll certainly keep an eye out for David Botton.)

Take a peek at

http://gnoga.com/#developers

-- 
Jeff Carter
"If I could find a sheriff who so offends the citizens of Rock
Ridge that his very appearance would drive them out of town ...
but where would I find such a man? Why am I asking you?"
Blazing Saddles
37

Re: Request for DSA Tutorials & Advice

[Shark8]

On Tuesday, January 16, 2018 at 1:32:42 PM UTC-7, polymorph self wrote:
> On Tuesday, January 16, 2018 at 10:43:22 AM UTC-5, Shark8 wrote:
> > I have a small project which I would like to use the DSA for -- the general functionality is simple: a database distributed over various servers. (The project is an implementation of MUMPS; which means the 'heart' of the project is a database implemented as a B-Tree distributed over multiple servers.)
> > 
> > I know that the DSA can do this, and I would like to know how, but I have no experience with the DSA. Also, and this I'm unsure of, can a DSA application add/remove [storage] nodes dynamically? (If so, "hot-swapably"?) -- Such a facility would be a great boon to horizontal scaling.
> > 
> > If successful, this project will be quite useful to the MUMPS community (as a full-Ada implementation would be quite portable) -- but it could also help the Ada community because MUMPS is _THE_ backend language for [electronic] medical records (certainly within the VA) and an Ada implementation could provide for some good Ada interop into the system. (Thus getting Ada's toe in the door for non-embedded/non-device medical applications.)
> > 
> > -----
> > I'll post a gethub link to the project once I get a bit more info and a bit more fleshed out architecturally.
> 
> whats dsa?

Distributed Systems Annex -- See http://www.adaic.org/resources/add_content/standards/12rm/html/RM-E.html