<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Sep 8, 2016, at 7:18 AM, Burke, Jeff <<a href="mailto:jburke@remap.ucla.edu" class="">jburke@remap.ucla.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">Hi,<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">(Sorry for these messages all at once, and let me know if this should go to ndn-interest.)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">Through an earlier conversation with Lixia this week, I realized that the definition / expectations of a ‘repo’ may be more specific than I previously understood. In particular, she mentioned that repos storing and registering the same namespace should (eventually) have the same data for that namespace, presumably via sync.</span></div></div></div></blockquote><div><br class=""></div><div class=""><div class="WordSection1" style="page: WordSection1; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt;" class=""><span class=""><o:p class="">I'll start by saying that this is all researchy: we are walking into a new territory that we are yet to fully explore.</o:p></span></div><div style="margin: 0in 0in 0.0001pt;" class=""><span class=""><o:p class="">So what I said, before or here, is just to share ideas with others.</o:p></span></div><div style="margin: 0in 0in 0.0001pt;" class=""><span class=""><o:p class=""><br class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt;" class="">It is easy to see why a desire of all repos for the same name prefix being sync'ed up: an interest for that prefix may be forwarded to any of the repos, if all repos have the same data, anyone can answer it; otherwise routers have to handle NACKs and reroute the interest to try other repos.</div><div style="margin: 0in 0in 0.0001pt;" class=""><br class=""></div><div style="margin: 0in 0in 0.0001pt;" class=""><br class=""></div></div></div><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">A few related questions:<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">1) Is this attempt at eventual consistency of what’s stored for a given namespace a requirement to be called a ‘repo’? </span></div></div></div></blockquote><div><br class=""></div>see the above explanation.</div><div><span style="background-color: rgb(255, 255, 255);" class="">I wont call it a requirement, but desirable for performance concerns.</span></div><div><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><br class=""></div></div></div><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">2) Practically, if such sync is ultimately required behavior for a repo, will/should repo-ng itself incorporate some basic synchronization features? </span></div></div></div></blockquote><div><br class=""></div>as I mentioned, there was a piece of work done on repo sync 2 years back (but I dont know its implementation status)</div><div><span style="font-size: 11pt; font-family: Calibri; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div><span style="font-size: 11pt; font-family: Calibri; background-color: rgb(255, 255, 255);" class=""> </span><br class=""><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">3) Does opportunistic caching behavior (without sync) mean that the storage is not a ‘repo’?</span></div></div></div></blockquote><div><br class=""></div>My own view: no.</div><div>my explanation to others:</div><div>- caching: opportunistic </div><div>- (managed) repo: managed storage<br class=""><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class=""><o:p class=""></o:p></span></div></div></div></blockquote><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div></div></div><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">4) Would, for example, network-attached storage that stores everything for a prefix but only up to a given depth in the tree not qualify as a repo? </span></div></div></div></blockquote><div><br class=""></div>everything is attached to the network :)</div><div>so I am not sure what "network-attached storage" really means.</div><div><br class=""></div><div><span style="background-color: rgb(255, 255, 255);" class="">if your question is "what if a managed repo for a name prefix only contains incomplete data under that prefix" -- that still works, and *may* even work OK if one understands the traffic patterns so that most of the Interests forwarded to that repo can be satisfied, without having to zigzagging to other places seeking for data.</span></div><div><span style="font-size: 11pt; font-family: Calibri; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div><span style="font-size: 11pt; font-family: Calibri; background-color: rgb(255, 255, 255);" class=""> </span><br class=""><blockquote type="cite" class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">5) Or, for example, in the BMS case, if I use a repo to store all of the electrical current samples for the UCLA campus, but not chilled water, it will have only have some of the tree for the campus bms prefix. Is the storage not a repo? Should it not be registering the root bms prefix? Should I have / what do I call storage that is filling in part of the tree but don’t need to or can’t store all of it? </span></div></div></blockquote><div><br class=""></div><div>1/ if chilled water has its own prefix announcement, maybe one can find a way to attract all interests for chilled water data to the place for chilled water.</div><div>3/ again one needs to think not just what one wants to put where, but also how forwarding can work well.</div><div><br class=""></div><div><br class=""></div><blockquote type="cite" class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: Calibri;" class=""><span style="font-size: 11pt;" class="">6) What are other requirements to be a ‘repo’? (Alternatively, is there a canonical reference in the literature for the type of storage that constitutes a repo?)</span></div></div></blockquote><br class=""></div><div><div>it does not really matter what we want to call something.</div><div>there is no arbitrary requirement. </div><div>as I said already, this is research, we have not done much playing with repo up to now. It is all about figuring out how to make the system work in the best way it can.</div><div><br class=""></div><div>my 2 cents,</div><div>Lixia</div></div><br class=""></body></html>