[Ndn-interest] Question regarding consistency

[aniesh chawla]

Thanks everyone.

Lixia,
you were right, I was looking for the third point.

Wentao,
Thanks for the clarification about NDNFS

So If I run ChronoSync, it will provide me with eventual consistency but
there are timers associated with them which might make things bit difficult
and complex. Do you think that is timers(as in ChornoSync) is the right way
to go forward or was it more like Proof Of Concept to showcase that
synchronization is possible? Personally I don't like timers which are
associated with network (in this case propagation delay), I had really bad
experience when I did beacon synchronization which was almost like the one
mentioned in ChronoSync in my earlier project and every time we end up
changing the timers.

Regards
Aniesh

On Tue, Aug 25, 2015 at 9:22 AM, Wentao Shang <wentaoshang at gmail.com> wrote:

>
> > On Aug 24, 2015, at 6:12 AM, aniesh chawla <chawla.aniesh at gmail.com>
> wrote:
> >
> > Hello Everyone,
> >
> > I have a very basic doubt which I could not resolve while reading
> documentation of NDN. I would like to also take this as research topic if
> my doubt is valid.
> >
> > The question is:
> > How is the consistency of data maintained in the network? Since, NDN is
> "pull" based networking and lets say there is change in file version at one
> of the node and not in other nodes. I can see the this can be achieved
> through NDNFS, but still the other nodes will not have change in version of
> the file. So, how will the new node who is requesting for that file will
> get to know which version to ask for?
>
> Hi Aniesh,
>
> As Lixia said in her reply, NDN is a layer-3 protocol. While it moves some
> of the application layer functionalities into the network layer, it cannot
> solve every problem the application faces.
>
> NDNFS is a piece of software that demonstrates the idea of integrating
> application data unit (i.e., file blocks) with network data unit (i.e., NDN
> data packets). It was originally designed to be a local file system without
> any remote replication. Therefore the data consistency issue was
> conveniently ignored.
>
> If you need synchronization across multiple copies of the data, you may
> run your application on top of ChronoSync, which gives you some form of
> eventual consistency.
>
> Best,
> Wentao
>
> > If we use NDNS to resolve every such query and we use time stamp as
> version then also it should be propagated throughout the network? I also
> see that Chrono-sync does something like this but it has waiting timer for
> propagation delays. So either NDNS is talking to every node in the whole
> network or some other way.
> >
> > Is my understanding correct or am I missing something here?
> >
> > Thanks a lot
> >
> > Regards
> > Aniesh
> > _______________________________________________
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>
>
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