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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-12727" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-439d3cc6-c609-4ec7-98e3-2339ff46a07b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12727" style="color: #3b73af; text-decoration: none">HHH-12727</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-12727" style="color: #3b73af; text-decoration: none">Performance improvement in ResourceRegistryStandardImpl.register line 68</a> </span> </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"> 5.2.17 </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"> 25/Jun/2018 16:31 PM </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="rdearnaley" id="email_rdearnaley" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=rdearnaley" style="color:#6c797f;; color: #3b73af; text-decoration: none">Roger Dearnaley</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">While using the YourKit performance monitoring tool I found two hotspots in file hibernate-core/src/main/java/org/hibernate/resource/jdbc/internal/ResourceRegistryStandardImpl.java function register(Statement statement, boolean cancelable) lines 67-70 at the first and last lines (67 and 70) inside Object.hashCode():</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">if</span> ( xref.containsKey( statement ) ) {
<span class="code-keyword" style="color: #000091">throw</span> <span class="code-keyword" style="color: #000091">new</span> HibernateException( <span class="code-quote" style="color: #009100">"JDBC Statement already registered"</span> );
}
xref.put( statement, <span class="code-keyword" style="color: #000091">null</span> );
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There are two problems here:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">a) on the no-exception-thrown code path both the containsKey( statement ) and .put( statement, null ) hash the Statement object – hashing it twice is wasteful</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">b) the Statement object (which in our particular case is a com.zaxxer.hikari.pool.HikariProxyPreparedStatement wrapping a com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement) is large and has a lot of fields, some of which seem to be to do with current status rather than identity, which could cause cache misses in the xref hash. If possible, it would be much more efficient to override the default behavior of .hashCode() and .equals() for implementations of Statement to only take into account fields that describe identity, rather than current status. In particular, if an implementation of Statement already has a functional unique identifier, both .hashCode() and .equals() should depend just on that. In our particular case, statement.connection.traceId and statement.delegate.traceId look like they might be unique identifiers. I understand that handling this correctly might require work from the HikariCP connection pool and/or the Microsoft JDBC driver code as well as or instead of from Hibernate.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Issue a) can be fixed by changing the code lines above to:</p>
<div class="code 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">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Set<ResultSet> already = xref.put( statement, Collections.EMPTY_SET );
<span class="code-keyword" style="color: #000091">if</span> ( already != <span class="code-keyword" style="color: #000091">null</span> ) {
xref.put( statement, already );
<span class="code-keyword" style="color: #000091">throw</span> <span class="code-keyword" style="color: #000091">new</span> HibernateException( <span class="code-quote" style="color: #009100">"JDBC Statement already registered"</span> );
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">thus avoiding hashing twice on the no-exception-thrown code path, and also changing hibernate-core/src/main/java/org/hibernate/resource/jdbc/internal/ResourceRegistryStandardImpl.java function release(Statement statement) lines 81-92 from:</p>
<div class="code 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">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// Keep <span class="code-keyword" style="color: #000091; color: #808080">this</span> at DEBUG level, rather than warn. Numerous connection pool implementations can <span class="code-keyword" style="color: #000091; color: #808080">return</span> a
</span> <span class="code-comment" style="color: #808080">// proxy/wrapper around the JDBC Statement, causing excessive logging here. See HHH-8210.
</span> <span class="code-keyword" style="color: #000091">if</span> ( log.isDebugEnabled() && !xref.containsKey( statement ) ) {
log.unregisteredStatement();
}
<span class="code-keyword" style="color: #000091">else</span> {
<span class="code-keyword" style="color: #000091">final</span> Set<ResultSet> resultSets = xref.get( statement );
<span class="code-keyword" style="color: #000091">if</span> ( resultSets != <span class="code-keyword" style="color: #000091">null</span> ) {
closeAll( resultSets );
}
xref.remove( statement );
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">to:</p>
<div class="code 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">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">final</span> Set<ResultSet> resultSets = xref.get( statement );
<span class="code-keyword" style="color: #000091">if</span> ( resultSets != <span class="code-keyword" style="color: #000091">null</span> ) {
closeAll( resultSets );
} <span class="code-keyword" style="color: #000091">else</span> <span class="code-keyword" style="color: #000091">if</span> ( log.isDebugEnabled() ) {
<span class="code-comment" style="color: #808080">// Keep <span class="code-keyword" style="color: #000091; color: #808080">this</span> at DEBUG level, rather than warn. Numerous connection pool implementations can <span class="code-keyword" style="color: #000091; color: #808080">return</span> a
</span> <span class="code-comment" style="color: #808080">// proxy/wrapper around the JDBC Statement, causing excessive logging here. See HHH-8210.
</span> log.unregisteredStatement();
}
xref.remove( statement );
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> and changing function register(ResultSet resultSet, Statement statement) lines 203-213 from:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">if</span> ( statement != <span class="code-keyword" style="color: #000091">null</span> ) {
<span class="code-comment" style="color: #808080">// Keep <span class="code-keyword" style="color: #000091; color: #808080">this</span> at DEBUG level, rather than warn. Numerous connection pool implementations can <span class="code-keyword" style="color: #000091; color: #808080">return</span> a
</span> <span class="code-comment" style="color: #808080">// proxy/wrapper around the JDBC Statement, causing excessive logging here. See HHH-8210.
</span> <span class="code-keyword" style="color: #000091">if</span> ( log.isDebugEnabled() && !xref.containsKey( statement ) ) {
log.debug( <span class="code-quote" style="color: #009100">"ResultSet statement was not registered (on register)"</span> );
}
Set<ResultSet> resultSets = xref.get( statement );
<span class="code-keyword" style="color: #000091">if</span> ( resultSets == <span class="code-keyword" style="color: #000091">null</span> ) {
resultSets = <span class="code-keyword" style="color: #000091">new</span> HashSet<ResultSet>();
xref.put( statement, resultSets );
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">to:</p>
<div class="code 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">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">if</span> ( statement != <span class="code-keyword" style="color: #000091">null</span> ) {
Set<ResultSet> resultSets = xref.get( statement );
<span class="code-keyword" style="color: #000091">if</span> ( resultSets == <span class="code-keyword" style="color: #000091">null</span> ) {
<span class="code-comment" style="color: #808080">// Keep <span class="code-keyword" style="color: #000091; color: #808080">this</span> at DEBUG level, rather than warn. Numerous connection pool implementations can <span class="code-keyword" style="color: #000091; color: #808080">return</span> a
</span> <span class="code-comment" style="color: #808080">// proxy/wrapper around the JDBC Statement, causing excessive logging here. See HHH-8210.
</span> <span class="code-keyword" style="color: #000091">if</span> ( log.isDebugEnabled() ) {
log.debug( <span class="code-quote" style="color: #009100">"ResultSet statement was not registered (on register)"</span> );
}
resultSets = Collections.EMPTY_SET;
}
<span class="code-keyword" style="color: #000091">if</span> ( resultSets == Collections.EMPTY_SET ) {
resultSets = <span class="code-keyword" style="color: #000091">new</span> HashSet<ResultSet>();
xref.put( statement, resultSets );
}
</pre>
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<td id="footer-pattern-text" class="mobile-resize-text" width="100%" style="padding: 0; border-collapse: collapse; color: #999999; font-size: 12px; line-height: 18px; font-family: Arial, sans-serif; mso-line-height-rule: exactly; mso-text-raise: 2px"> This message was sent by Atlassian Jira <span id="footer-build-information">(v1001.0.0-SNAPSHOT#100087-<span title="5afc7cd4e3752dc6896b77a3986e41de9a0d0517" data-commit-id="5afc7cd4e3752dc6896b77a3986e41de9a0d0517}">sha1:5afc7cd</span>)</span> </td>
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<td id="footer-pattern-logo-desktop-padding" style="padding: 0; border-collapse: collapse; padding-top: 3px; opacity: 0.150"> <img id="footer-pattern-logo-desktop" src="cid:jira-generated-image-static-footer-desktop-logo-8ece5e87-51d0-418b-9c5d-1a1b6943dfb3" alt="Atlassian logo" title="Atlassian logo" width="192" height="24" class="image_fix"> </td>
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