<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><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; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>On Sep 8, 2014, at 12:58 PM, Dave Oran (oran) <<a href="mailto:oran@cisco.com">oran@cisco.com</a>> wrote:</div></div></span></span></div><div><br class="Apple-interchange-newline"><blockquote type="cite">I don’t mean to hijack this thread, but it seems that the architecture needs two cache timers, not one.<br><br>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><br></div><div>I am not sure if it is always possible for a data producer to predict the time when the data will become invalid. Take DNS as an example, the authoritative server may never know when one of the records will be changed.</div><div><br></div><div>Yingdi </div></body></html>