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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-12933" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-0d95f29a-6598-48c2-ba3d-6dbbc1ded848" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12933" style="color: #3b73af; text-decoration: none">HHH-12933</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-12933" style="color: #3b73af; text-decoration: none">Generate_statistics grows QueryStatistics ConcurrentHashMap indefinitely</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-0d95f29a-6598-48c2-ba3d-6dbbc1ded848" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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"> 5.1.12 </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"> Unassigned </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"> 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"> 28/Aug/2018 03:27 AM </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"> core documentation hibernate performance </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-minor-1dc305b2-dc30-434d-886e-4e391d116fe2" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </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="stolwijk.arian" id="email_stolwijk.arian" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=stolwijk.arian" style="color:#6c797f;; color: #3b73af; text-decoration: none">arian</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">We've encountered a problem with the generate_statistics configuration in production.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The ConcurrentStatisticsImpl uses a ConcurrentHashMap that saves the statistics for all the HQL queries that are executed. However from our application we generate a lot of unique query HQL queries because we use the JPA query builder, and something like this:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">{{ public void query(int id, int userId) </p> { // ... CriteriaBuilder builder = session.getCriteriaBuilder(); CriteriaQuery<InboxMessage> query = builder.createQuery(InboxMessage.class); Root<InboxMessage> root = query.from(InboxMessage.class); query.where(builder.and( builder.equal(root.get(InboxMessage_.id), id)), builder.equal(root.get(InboxMessage_.inboxUser).get("id"), userId)); // ... } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">}}</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">creates a new query string for each new input.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is problematic because the map only grows, and after a couple of days our application consumes too much memory.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It seems possible to clear the stats periodically, however:</p>
<ul class="alternate" type="square">
<li>the default behavior 'leaks' memory</li>
<li>it's not documented</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">So perhaps it'd be better to have a default <tt>max_size</tt> option or something to limit the size of the queryStatistics.</p> </td>
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