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<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Edward,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Can you explain a little more about you mean (example maybe) with “</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I'm
also curious about how could this happen if the object URL is the unique identity. How does the server exactly know what client request is another object? Based on what kind of information?”<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Paul<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Hua
ZZ Zhang [mailto:zhuadl@cn.ibm.com] <br>
<b><span style="font-weight:bold">Sent:</span></b> Monday, June 03, 2013 2:50 AM<br>
<b><span style="font-weight:bold">To:</span></b> Luse, Paul E<br>
<b><span style="font-weight:bold">Cc:</span></b> openstack@lists.launchpad.net; Openstack<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Openstack] [Swift] Storage Server Redirection<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p style="margin-bottom:12.0pt"><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">>> 2) The basic idea is that an object server (via middleware or otherwise) will be given the ability to respond to a request to
indicate ‘not me but I know who should handle this’. I’m thinking this makes more sense as a 5xx response with additional information (partition, nodes) about the route included in the response body (as opposed to a 3xx code) </span></font><br>
<br>
<font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">My concern</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> is that 5xx response is a kind of error that
occurs on server side. The server can't handle the client request</span></font><br>
<font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">due to internal error (500), not implemented (501), bad gateway(502), service unavailable(503), gateway timeout(504)</span></font><br>
<font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">or http version not supported(505). It doesn't make much sense to use it in your context of '</span></font><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">not
me but I know who should handle this’</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">.</span></font><br>
<br>
<font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I'm also curious about how could this happen if the object URL is the unique identity. How does the server exactly know what client
</span></font><br>
<font size="2" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">request is another object? Based on what kind of information?</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><font size="1" face="Times New Roman"><span style="font-size:7.5pt;font-family:"Times New Roman","serif";font-weight:bold">Edward Zhang(</span></font></b><b><font size="1"><span lang="ZH-CN" style="font-size:7.5pt;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman";font-weight:bold">张华</span></font></b><b><font size="1" face="Times New Roman"><span style="font-size:7.5pt;font-family:"Times New Roman","serif";font-weight:bold">)</span></font></b><font size="1" face="Times New Roman"><span style="font-size:7.5pt;font-family:"Times New Roman","serif""><br>
Advisory Software Engineer<br>
Software Standards & Open Source Software<br>
Emerging Technology Institute(ETI)<br>
IBM China Software Development Lab<br>
e-mail: <a href="mailto:zhuadl@cn.ibm.com">zhuadl@cn.ibm.com</a></span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><img border="0" width="1" height="1" id="_x0000_i1025" src="cid:image002.png@01CE6019.3FCC0FF0"><o:p></o:p></span></font></p>
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<img border="0" width="16" height="16" id="_x0000_i1026" src="cid:image003.gif@01CE6019.3FCC0FF0" alt="Inactive hide details for "Luse, Paul E" ---2013-06-01 上午 07:53:21---"Luse, Paul E" <paul.e.luse@intel.com>"></span></font><font size="2" color="#424282" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#424282">"Luse,
Paul E" ---2013-06-01 </span></font><font size="2" color="#424282"><span lang="ZH-CN" style="font-size:10.0pt;mso-ascii-font-family:Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial;color:#424282">上午</span></font><font size="2" color="#424282" face="Arial"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#424282">
07:53:21---"Luse, Paul E" <<a href="mailto:paul.e.luse@intel.com">paul.e.luse@intel.com</a>></span></font><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";font-weight:bold">"Luse, Paul E" <<a href="mailto:paul.e.luse@intel.com">paul.e.luse@intel.com</a>></span></font></b><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif""> </span></font><br>
<font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">Sent by: "<span class="SpellE">Openstack</span>" <<a href="mailto:openstack-bounces+zhuadl=cn.ibm.com@lists.launchpad.net">openstack-bounces+zhuadl=cn.ibm.com@lists.launchpad.net</a>></span></font>
<o:p></o:p></p>
<p style="margin-left:.5in"><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">2013-06-01
</span></font><font size="1"><span lang="ZH-CN" style="font-size:7.5pt;mso-ascii-font-family:Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial">上午</span></font><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">
07:53</span></font><o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">To</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><img border="0" width="1" height="1" id="_x0000_i1028" src="cid:image002.png@01CE6019.3FCC0FF0"><o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:.5in"><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">"<a href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a>" <<a href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a>>,
</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><img border="0" width="58" height="1" id="_x0000_i1029" src="cid:image004.png@01CE6019.3FCC0FF0"><o:p></o:p></span></font></p>
<p class="MsoNormal" align="right" style="text-align:right"><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">cc</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><img border="0" width="1" height="1" id="_x0000_i1030" src="cid:image002.png@01CE6019.3FCC0FF0"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><img border="0" width="58" height="1" id="_x0000_i1031" src="cid:image004.png@01CE6019.3FCC0FF0"><o:p></o:p></span></font></p>
<p class="MsoNormal" align="right" style="text-align:right"><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">Subject</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="SimSun"><span style="font-size:12.0pt"><img border="0" width="1" height="1" id="_x0000_i1032" src="cid:image002.png@01CE6019.3FCC0FF0"><o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:.5in"><font size="1" face="Arial"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">[Openstack] [Swift] Storage Server Redirection</span></font><o:p></o:p></p>
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<p><font size="3" face="SimSun"><span style="font-size:12.0pt"><br>
</span></font><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">I’m looking at tacking this item:</span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="3" face="SimSun"><span style="font-size:12.0pt"><a href="https://blueprints.launchpad.net/swift/+spec/support-storage-server-redirects"><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">https://blueprints.launchpad.net/swift/+spec/support-storage-server-redirects</span></font></a></span></font><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">and wanted to get some feedback on the following observations/thoughts:</span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">1) This is a capability that would be checked in independent of other blueprints that might use it (2 are mentioned in the link above) and unit test code would
be the only way to initially exercise it; it essentially enables other activities at this point</span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">2) The basic idea is that an object server (via middleware or otherwise) will be given the ability to respond to a request to indicate ‘not me but I know who
should handle this’. I’m thinking this makes more sense as a 5xx response with additional information (partition, nodes) about the route included in the response body (as opposed to a 3xx code) </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">3) The proxy server will be modified to process the response accordingly but using the partition, nodes info from the response as opposed to object_ring.get_nodes()
to determine which nodes to use</span></font> <o:p></o:p></p>
<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">4) Protection will be required to avoid endless redirection loops</span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">5) This applies only to GET operations</span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
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<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">Appreciate any thoughts/feedback., In addition to the two usages of this capability referenced in the blueprint I think there’s applicable to another Tiering
blueprint which interests me as well.</span></font> <o:p></o:p></p>
<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font>
<o:p></o:p></p>
<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">Thanks</span></font>
<o:p></o:p></p>
<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">Paul</span></font>
<o:p></o:p></p>
<p><font size="2" face="Calibri"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif""> </span></font><tt><font size="2" face="SimSun"><span style="font-size:10.0pt">_______________________________________________</span></font></tt><font size="2"><span style="font-size:10.0pt"><br>
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