[Ndn-interest] Question regarding consistency

Muhammad Hosain Abdollahi Sabet mhasabet at gmail.com
Mon Aug 24 11:16:34 PDT 2015

If all the replicas of the requested data, run chrono-sync among
themselves, there shouldn't be any problem but the one with waiting timer,
right? So the consumer can find the final version using mustbefresh.

I didn't understand your question about NDNS. If there isn't any
delegation(e.g publisher doesn't need/want to publish content globally),
NDNS won't resolve names.

On Mon, Aug 24, 2015 at 10:01 PM, Alex Afanasyev <
alexander.afanasyev at ucla.edu> 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? 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.
> To discover that a newer version of some data is available, you need to
> have additional mechanisms to discover newer name (version) of the data.
> What you have mentioned is correct:  you can rely on ChronSync to notify
> about new published data items, you can use manifest and manifest-like
> mechanisms (e.g., NDNFS, NDNS) where consumers when desired retrieve
> information about current ("fresh") status of published data.  In either
> case, what you get is exact name of new data, including version number.
> Selector mechanism that Tai-Lin mentioned is a way to get different data
> from what you already have.  It can be used for newer version discovery,
> though it can have additional implications from packet processing
> perspective.
> --
> Alex
> > Is my understanding correct or am I missing something here?
> >
> > Thanks a lot
> >
> > Regards
> > Aniesh
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