<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Isn't it true that a memcached server more likely "goes down" becaouse its machine has been restarted, or the process crashed?</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">So usually you'll end up with an empty server which does not have stale data.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">a.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR><DIV><DIV>On Jul 4, 2007, at 8:43 AM, Dustin Sallings wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"> <BR><DIV><DIV>On Jul 3, 2007, at 23:29 , Ben Manes wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><SPAN class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: 'times new roman'; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: 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: 0; ">Well, the way I would resolve it is to have the client delete the key associated in bucket_2 before storing the value into bucket_1. The client is migrating the "dead" bucket back into the "alive" bucket at some point of time. If the key points to a dead bucket, but that bucket is marked for becoming active again, it should take the extra step of recalculating the newKey_1 and deleting it before inserting key_1 into bucket_1.<BR><BR>This should resolve the issue without broadcasting messages, but requires that it is handled during the bucket lookup phase.<BR></SPAN></BLOCKQUOTE></DIV><DIV><BR class="webkit-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>Without recording every key store on every client for every node that was not the primary node for that key, you just can't do that. You also can't assume node 2 was up when node 1 was down. What if a key destined for node 1 went to node 3?<BR class="webkit-block-placeholder"></DIV><DIV><BR class="webkit-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>The only options are to ignore the problem or broadcast invalidation on mutation.<BR class="webkit-block-placeholder"></DIV><DIV><BR class="webkit-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>(I'm saying that in an extreme hoping someone will come up with something new and exciting).<BR class="webkit-block-placeholder"></DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>-- </DIV><DIV>Dustin Sallings</DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></BLOCKQUOTE></DIV><BR></BODY></HTML>