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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US">Hi Nick,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US">agreed. Thank you for the fingerpost that seems worth following. I first have to dig a little bit deeper and may get back to you
later.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US">Urs<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="DE">Von:</span></b><span lang="DE"> Nick Briggs <nicholas.h.briggs@gmail.com>
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<b>Gesendet:</b> Freitag, 4. Mai 2018 01:06<br>
<b>An:</b> Urs Schnurrenberger <urs.schnurrenberger@unibas.ch><br>
<b>Cc:</b> Junxiao Shi <shijunxiao@email.arizona.edu>; ndn-interest@lists.cs.ucla.edu<br>
<b>Betreff:</b> Re: [Ndn-interest] Freshness & Latest Content<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On May 3, 2018, at 3:33 PM, Urs Schnurrenberger <<a href="mailto:urs.schnurrenberger@unibas.ch">urs.schnurrenberger@unibas.ch</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Hi Junxiao,</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">thanks for the answers and the link. I have a follow-up question:</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">What then happens when the (same as below) Interest</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> /nytimes/frontpage | CanBePrefix=true | MustBeFresh=true</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">arrives at a cache with the sole content</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> <span class="apple-converted-space"> </span>/nytimes/frontpage/addBanner/v23 | 60'000ms</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">?</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">According to prefix matching and a positive freshnessPeriod, will I receive the addBanner only and never the complete front page?</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal">Yes, but the publisher would be shooting themselves in the foot to publish it with such a structure. They're much more likely to publish<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"> </span>/nytimes/frontpage/v105/adBanner/v23 | 60000 ms<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">They would also be smarter to publish with a date coded version so an application could make an educated guess at the version it should be retrieving.<o:p></o:p></p>
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<p class="MsoNormal">Namespace design for an application (or class of applications) is really important in order for things to work smoothly.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This issue was why the original CCN protocol specification had MinSuffixComponents/MaxSuffixComponents optionally on the Interest so the application wouldn't get shut out by longer names that were long lived and shadowed the shorter name
you were looking for. I think that got dropped somewhere in the evolution of NDN, but I don't know where. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Best regards,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Urs</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="DE">Von:</span></b><span class="apple-converted-space"><span lang="DE"> </span></span><span lang="DE">Junxiao Shi <</span><a href="mailto:shijunxiao@email.arizona.edu"><span lang="DE" style="color:purple">shijunxiao@email.arizona.edu</span></a><span lang="DE">><span class="apple-converted-space"> </span><br>
<b>Gesendet:</b><span class="apple-converted-space"> </span>Donnerstag, 3. Mai 2018 23:37<br>
<b>An:</b><span class="apple-converted-space"> </span>Urs Schnurrenberger <</span><a href="mailto:urs.schnurrenberger@unibas.ch"><span lang="DE" style="color:purple">urs.schnurrenberger@unibas.ch</span></a><span lang="DE">><br>
<b>Cc:</b><span class="apple-converted-space"> </span></span><a href="mailto:ndn-interest@lists.cs.ucla.edu"><span lang="DE" style="color:purple">ndn-interest@lists.cs.ucla.edu</span></a><span lang="DE"><br>
<b>Betreff:</b><span class="apple-converted-space"> </span>Re: [Ndn-interest] Freshness & Latest Content</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Hi Urs</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">I have some conceptual questions about freshness and how to ask for latest content.</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Imagine 2 properly versioned versions of /nytimes/frontpage (properly in the sense of<span class="apple-converted-space"> </span></span><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">“</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">larger</span><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">”</span><span class="apple-converted-space"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span></span><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">version
=<span class="apple-converted-space"> </span></span><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">“</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">newer</span><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">”</span><span class="apple-converted-space"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span></span><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">version,
according to [1]):</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">format : contentName | freshnessPeriod</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">/nytimes/frontpage/v100 | 100ms [stored at cache X somewhere between requester and producer]</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">/nytimes/frontpage/v105 | 300ms [stored at producer]</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">I assume that if a user does only know about the contentName (prefix), but not about the latest versionNumber, he/she asks for</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Interest: /nytimes/frontpage | CanBePrefix=true | MustBeFresh=true</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Yes, that's what consumer should ask for.</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Question 1:</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Is it correct that this Interest is satisfied by cache X because there is a prefix match on the contentName and a freshnessPeriod > 0?</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Yes, X will return /nytimes/frontpage/v100 until it becomes non-fresh.</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Question 2:</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Assuming the answer to Q1 is<span class="apple-converted-space"> </span></span><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">‘</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">yes</span><span style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">’</span><span class="apple-converted-space"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span></span><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">and
that the reuqester does NOT know the latest versionNumber, is there really no possibility for the requester to get the globally latest version v105 directly from the producer?</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">It is possible but requires changes on producer. See </span><a href="https://redmine.named-data.net/issues/4396#note-1" target="_blank"><span lang="EN-US" style="color:purple">https://redmine.named-data.net/issues/4396#note-1</span></a><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Question 3:</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Malgun Gothic",sans-serif">Assuming that the requester KNOWS the latest versionNumber (from some miraculous oracle), I guess she/he can simply ask for (/nytimes/frontpage/v105 | CanBePrefix=false
| MustBeFresh=true). Correct?</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Yes, the Interest should have version number if the consumer knows it. </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal">Yours, Junxiao <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
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</span><a href="http://www.lists.cs.ucla.edu/mailman/listinfo/ndn-interest"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:purple">http://www.lists.cs.ucla.edu/mailman/listinfo/ndn-interest</span></a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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