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iDevice - please excuse typos.</div>
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On Sep 8, 2014, at 6:21 PM, Yingdi Yu <<a href="mailto:yingdi@cs.ucla.edu">yingdi@cs.ucla.edu</a>> wrote:<br>
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<div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; ">
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<div>On Sep 8, 2014, at 12:58 PM, Dave Oran (oran) <<a href="mailto:oran@cisco.com">oran@cisco.com</a>> wrote:</div>
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<blockquote type="cite">I don’t mean to hijack this thread, but it seems that the architecture needs two cache timers, not one.<br>
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One is an Expiry timer after which the data is no longer considered valid (and hence should not be returned from the cache if an interest arrives)</blockquote>
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<div>I am not sure if it is always possible for a data producer to predict the time when the data will become invalid.
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If not the producer, then who? All data kept outside an application's private (and possibly permanent) store has a validity period, if not shorter then at least no longer than the lifetime of the key that signed it.
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<div>Take DNS as an example, the authoritative server may never know when one of the records will be changed.</div>
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Wrong analogy. A DNS Authoritative server is like a repo, a producer is in effect the application that updated the DNS.</div>
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<div>Yingdi </div>
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