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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://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12626" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-9aecb78d-8c21-4c39-8fb7-3338f3643a26" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12626" style="color: #3b73af; text-decoration: none">HHH-12626</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://hibernate.atlassian.net/browse/HHH-12626" style="color: #3b73af; text-decoration: none">Avoid high CPU contention by not allocating Session UUIDs eagerly</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-9aecb78d-8c21-4c39-8fb7-3338f3643a26" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<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="sanne" id="email_sanne" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=sanne" style="color:#6c797f;; color: #3b73af; text-decoration: none">Sanne Grinovero</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"> hibernate-core </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"> 24/May/2018 13:14 PM </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"> 5.3.1 </td>
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<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-major-ab0f0630-339f-4402-8865-3a6b9848db6f" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<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="sanne" id="email_sanne" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=sanne" style="color:#6c797f;; color: #3b73af; text-decoration: none">Sanne Grinovero</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">When generating high load with a benchmark on a scalable server, the primary bottleneck becomes the UUID assignment to each <tt>Session</tt> :</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">Stack Trace Count Duration
sun.security.provider.NativePRNG$RandomIO.implNextBytes(byte[]) 28,035 883,878,174,458
sun.security.provider.NativePRNG$RandomIO.access$400(NativePRNG$RandomIO, byte[]) 28,035 883,878,174,458
sun.security.provider.NativePRNG.engineNextBytes(byte[]) 28,035 883,878,174,458
java.security.SecureRandom.nextBytes(byte[]) 28,035 883,878,174,458
java.util.UUID.randomUUID() 28,004 883,497,665,831
org.hibernate.id.uuid.StandardRandomStrategy.generateUUID(SharedSessionContractImplementor) 27,989 881,776,995,638
org.hibernate.internal.AbstractSharedSessionContract.<init>(SessionFactoryImpl, SessionCreationOptions) 27,989 881,776,995,638
org.hibernate.internal.AbstractSessionImpl.<init>(SessionFactoryImpl, SessionCreationOptions) 27,989 881,776,995,638
org.hibernate.internal.SessionImpl.<init>(SessionFactoryImpl, SessionCreationOptions) 27,989 881,776,995,638
org.hibernate.internal.SessionFactoryImpl$SessionBuilderImpl.openSession() 27,989 881,776,995,638
org.hibernate.internal.SessionFactoryImpl.buildEntityManager(SynchronizationType, Map) 23,157 802,857,346,608
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This UUID generation can be avoided, especially when temporary tables are not necessary.</p> </td>
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