[sr-dev] [SR-Users] rfc: distributing dialog profiles

[Alex Hermann]

On Friday 22 August 2014, Charles Chance wrote:
> On 22 August 2014 16:46, Alex Hermann <alex at speakup.nl> wrote:
> > Last week, i just built profile synchronisation in the dialog module,
> > based on
> > dmq. It took quite a bit of debugging time because of the state dmq was
> > in.
> 
> Can you expand a little on "the state dmq was in"?

I was hoping to use it as-is, but i encountered issues which had to be 
resolved before i could even use the module:

- As soon as i enabled the dmq module, i experienced segfaults.
- It had bad interaction with the maxfwd module
- Status updates between hosts were largely ignored.
- The configured server_address wasn't used to send messages.



> > It still has some rough edges, but i'll try to push a branch (shortly
> > after)
> > this weekend for review.
> 
> Looking forward to seeing it - may save me the time :)

I pushed my WIP to the branch alexh/dialog-sync-wip which also contains 
dialog and dmq fixes and cleanups.

It's WIP, so it might still change. This branch is only compile-tested so 
far, because i normally develop against 3.2. I just cherry-picked most of my 
patches to master.

Known issues:
 - Sync get off under load, cause unknown yet, but probably because of out-
of-order sync messages.

Still on the TODO list:
 - Delete 'disabled'  dmq hosts
 - Cope better with out-of-order sync messages
 - Sync initial state
 - Clean shutdown of DMQ, free all memory
 - More efficient protocol instead of JSON. Probably just write raw data in 
the packet, so the receiving side can just use a pointer into the buf 
instead of having to copy everything.

-- 
Alex



-- 
Alex Hermann