<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">There are multiple sets of channels - <div><br></div><div>Direct - to send messages to a specific instance of nova-compute on a specific host, Topic - to send messages to "all instances" of nova-compute, and then reply channels for the RPC mechanism to return values through the message queue based on message ID. </div><div><br></div><div>The fanout channel is only (at the moment) actively used by the nova-scheduler - the rpc.cast() and rpc.call() mechanisms are all using the topic (any instance of...) channels or the instance specific (directed to an instance on a host) channel.</div><div><br></div><div>-joe </div><div><br></div><div><div><div>On Aug 30, 2011, at 6:58 PM, heut2008 wrote:</div><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; 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; font-size: medium; "><div style="margin-top: 10px; margin-right: 10px; margin-bottom: 10px; margin-left: 10px; font-family: verdana; font-size: 10pt; "><div><font size="2" face="Verdana">hello everybody，</font></div><div> I installed rabbitmq-server management plugins to see the details about rpc .i find that every worker process for instance a nova-compute service makes for channels ibut only one channel has the three type(direct fanout topic) exchanges.</div><div> I wonder what the other channels used for?</div><div> </div><div align="left"><font color="#c0c0c0" size="2" face="Verdana">2011-08-31</font></div><font size="2" face="Verdana"><hr align="left" size="2" style="width: 122px; height: 2px; "><div><font color="#c0c0c0" size="2" face="Verdana"><span>heut2008</span></font></div></font>_______________________________________________<br>Mailing list:<span class="Apple-converted-space"> </span><a href="https://launchpad.net/~openstack">https://launchpad.net/~openstack</a><br>Post to :<span class="Apple-converted-space"> </span><a href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a><br>Unsubscribe :<span class="Apple-converted-space"> </span><a href="https://launchpad.net/~openstack">https://launchpad.net/~openstack</a><br>More help :<span class="Apple-converted-space"> </span><a href="https://help.launchpad.net/ListHelp">https://help.launchpad.net/ListHelp</a><br></div></span></blockquote></div><br></div></body></html>