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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://hibernate.atlassian.net/browse/HHH-4577" style="color: #3b73af; text-decoration: none">Re: 2L query cache: Low performance of flush and commit due many unnecessary (pre)invalidate calls on UpdateTimestampsCache</a> </span>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0; padding-top: 10px"> <span class="diffcontext">Hi Steve, thanks for accepting the pull request. I have replied to your pull request questions and agree with much of your analysis. Feel free to improve my code :)</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br /><br />To summarise my thoughts:<br />- Lazy instantiation of query spaces performs better in scenarios where remove() or removeLastN() are called. I'm not sure how often this happens in the real world.<br />- I don't see double iteration as a major issue (it's still O(n) performance), but eager instantiation of query spaces would solve the problem.<br /></span>
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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://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-4577" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-4577" style="color: #3b73af; text-decoration: none">HHH-4577</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://hibernate.atlassian.net/browse/HHH-4577" style="color: #3b73af; text-decoration: none">2L query cache: Low performance of flush and commit due many unnecessary (pre)invalidate calls on UpdateTimestampsCache</a> </span>
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Analyzing what our application is mainly doing during flush/commit, <br /> we saw that very often the concerning thread is executing in jbosscache stuff (see 2 sample stacktraces below).<br /> Analyzing the code we discovered that, if doing 1000 inserts for a determinate entity:<br /> -on flush UpdateTimestampsCache.preinvalidate() is called 1000 times for the same space ...
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