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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP" style="color: #3b73af; text-decoration: none">Shibboleth SP - C++</a> / <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-715" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-0487ffc2-495c-40c4-8f33-fc84d3ebcddc" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-715" style="color: #3b73af; text-decoration: none">SSPCPP-715</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-715" style="color: #3b73af; text-decoration: none">enable fetch of dynamic metadata using compression</a> </span>
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Issue Type:
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-0487ffc2-495c-40c4-8f33-fc84d3ebcddc" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /> Improvement
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Affects Versions:
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2.6.0
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Assignee:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#3b73af;; color: #3b73af; text-decoration: none">Scott Cantor</a>
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Components:
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Metadata
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Created:
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31/Oct/16 7:50 AM
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Priority:
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#3b73af;; color: #3b73af; text-decoration: none">Ian Young</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Unlike the V3 IdP, the V2.6 SP does not request dynamic (per-entity) metadata using the Accept-Encoding header to indicate that it can accept compressed data. This means that even if an MDQ server has a compressed version of the metadata available, it will not be sent. This will result in significantly larger transfers, relatively speaking, although as these documents are typically small relative to traditional aggregates the saving may not be large in absolute terms.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">For reference, in the UK federation, the 10 smallest per-entity metadata documents average 5.0KB and compress to an average of 2.8KB (56% of the size, uncompressed is 1.8x compressed).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The 10 largest per-entity metadata documents average 353.9KB and compress to an average of 58.4KB (16.5% of the size, uncompressed is 6x compressed). The UK federation may or may not be unusual in having such large individual entities (in this case, with large numbers of scopes).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">It is hard to know whether the extra CPU cost of decompression is worth the reduced transfer size, but I think I'd prefer to see it deferring to the MDQ server by requesting compressed metadata and letting the server reply with uncompressed data if it was costly to produce. Decompression is typically much faster than compression, so even if the MDQ server compresses needlessly it shouldn't result in a performance penalty (and handling additional network packets isn't free either, of course).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Failing that, we could retain the current default but allow compression to be enabled by an explicit setting. This would probably result in most people not bothering, of course, so it's not my preferred route.</p>
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