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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"><a href="https://shibboleth.atlassian.net/browse/MDA?atlOrigin=eyJpIjoiZGVjNDRiY2IyODI1NDRjMzk0ZDM4ZDA4YjM4YzEzZmYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Metadata Aggregator</a> / <a href="https://shibboleth.atlassian.net/browse/MDA-281?atlOrigin=eyJpIjoiZGVjNDRiY2IyODI1NDRjMzk0ZDM4ZDA4YjM4YzEzZmYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-24988f57-a763-4751-9315-5c0976a8d3b0" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://shibboleth.atlassian.net/browse/MDA-281?atlOrigin=eyJpIjoiZGVjNDRiY2IyODI1NDRjMzk0ZDM4ZDA4YjM4YzEzZmYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">MDA-281</a></td>
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<td style="vertical-align: top;; padding: 0; 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://shibboleth.atlassian.net/browse/MDA-281?atlOrigin=eyJpIjoiZGVjNDRiY2IyODI1NDRjMzk0ZDM4ZDA4YjM4YzEzZmYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Remove ComponentInfo system</a> </span></td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0; 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-24988f57-a763-4751-9315-5c0976a8d3b0" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">0.9.2</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><a class="user-hover" rel="557058:e127cb03-43ed-473d-b6ba-592949cb4be8" style="color:#3b73af;; color: #3b73af; text-decoration: none" id="email_557058:e127cb03-43ed-473d-b6ba-592949cb4be8" href="https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ae127cb03-43ed-473d-b6ba-592949cb4be8"> Ian Young </a></td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">Pipeline</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">29/Mar/23 6:48 AM</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Fix Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">0.10.0</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><img src="cid:jira-generated-image-static-trivial-55d957d0-e9c7-4400-a7a6-3814dbd8cae9" height="16" width="16" border="0" align="absmiddle" alt="Trivial" style="vertical-align: text-bottom"> Trivial</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"><a class="user-hover" rel="557058:e127cb03-43ed-473d-b6ba-592949cb4be8" style="color:#3b73af;; color: #3b73af; text-decoration: none" id="email_557058:e127cb03-43ed-473d-b6ba-592949cb4be8" href="https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ae127cb03-43ed-473d-b6ba-592949cb4be8"> Ian Young </a></td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"><p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">The MDA includes a mechanism which was originally intended to aid in performance monitoring, but which doesn’t do a very good job of that and as a result is probably entirely unused.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The mechanism is that <tt>SimplePipeline</tt> and <tt>AbstractStage</tt> unconditionally create a <tt>ComponentInfo</tt> instance to the item metadata of every item that passes through them. This is two timestamp calls and an object creation for every item passed through every stage, plus more object creation when the <tt>ComponentInfo</tt> instances are added to the item metadata collections. This seems quite expensive for something that is never used, and can’t be turned off. We should just abolish it for 0.10.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I’ll create separate tickets for replacement mechanisms; I can think of two approaches that might make sense. One is a specific mechanism in <tt>CompositeStage</tt> and <tt>SimplePipeline</tt> to <em>optionally</em> log progress (but not record it in the items). I have a mockup of this and I think it makes sense for 0.10. It also makes sense to look into a more targeted mechanism based on a hook for something like Metrics or Micrometer (the IdP uses the former, I think, while Spring Framework has some kind of relationship with the latter) but I have less of an idea as to the form that might take.</p></td>
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