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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-10563" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-f1d44cdb-1b1b-4cd4-adc0-720d5a09847b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10563" style="color: #3b73af; text-decoration: none">HHH-10563</a> </td>
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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-10563" style="color: #3b73af; text-decoration: none">Significant String use/duplication associated with subselect fetch</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: 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-f1d44cdb-1b1b-4cd4-adc0-720d5a09847b" 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.0.8, 4.2.21 </td>
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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"> Unassigned </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">Attachments:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> testcase.zip </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: 0px; 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 24/Feb/2016 15:36 PM </td>
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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-static-major-c6f4be7c-4912-4602-ae17-bb8ead7b1271" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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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="stephen.fikes" id="email_stephen.fikes" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=stephen.fikes" style="color:#6c797f;; color: #3b73af; text-decoration: none">Stephen Fikes</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Finding that the use of @Fetch(FetchMode.SUBSELECT) results in a significant level of string duplication for SQL and SQL fragments. When loading large datasets and/or higher numbers of associations with multiple associations using SUBSELECT the memory can accumulate significantly (e.g. on the order of multiple GB for string space associated with the duplicate SQL fragments alone). The testcase has a rather small set of strings for only 600 simple entities.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The strings seem to be retained in a hierarchy like the below:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 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-word; white-space: pre-wrap">class support.hibernate.entity.TestHibernate @ 0x82f29800 Native Stack
'- entityManager org.hibernate.ejb.EntityManagerImpl @ 0xd9d931d8
'- session org.hibernate.internal.SessionImpl @ 0xd9d6e858
'- persistenceContext org.hibernate.engine.internal.StatefulPersistenceContext @ 0xd9e918e8
'- batchFetchQueue org.hibernate.engine.spi.BatchFetchQueue @ 0xd9f766d0
'- subselectsByEntityKey java.util.HashMap @ 0xd9f766f0
'- table java.util.HashMap$Entry[512] @ 0xd868c8d8
|- [91] java.util.HashMap$Entry @ 0xd8689588
| |- value org.hibernate.engine.spi.SubselectFetch @ 0xd8689540
| | '- queryString java.lang.String @ 0xd8689568 from Employee employee0_
...
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">An OQL query (in Eclipse MAT) like the below was used to obtain the strings/fragments related to queries when running in the debugger with a breakpoint at commit (e.g. in the attached test).</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 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-word; white-space: pre-wrap">select s.toString().length() as strlen, s.toString() from java.lang.String s where s != null and (
s.toString().contains("from Employee") or s.toString().contains("from Task")
)
</pre>
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