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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/HSEARCH" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-2773" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-3bd6881b-e537-42b6-a3bc-06bcb18c13da" height="16" width="16" border="0" align="absmiddle" alt="Sub-task" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-2773" style="color: #3b73af; text-decoration: none">HSEARCH-2773</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/HSEARCH-2773" style="color: #3b73af; text-decoration: none">JSR-352: The first partition always has one less element</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"> jsr352 </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"> 12/Jun/2017 02:28 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"> <a class="user-hover" rel="yrodiere" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none">Yoann Rodière</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">I've noticed this when logging progress to debug <span class="jira-issue-macro" data-jira-key="HSEARCH-2758">
<!-- replace the span with an AUI template --> <a href="https://hibernate.atlassian.net/browse/HSEARCH-2758" class="jira-issue-macro-key issue-link" title="JSR-352: Fix incorrect indexing progress monitor" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12156&avatarType=issuetype"> HSEARCH-2758 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-current jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Pull Request Sent</span> </span> .</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">See this code in <tt>PartitionMapper</tt>:</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">private</span> List<PartitionBound> buildPartitionUnitsFrom(ScrollableResults scroll, <span class="code-object" style="color: #910091">Class</span><?> clazz) {
List<PartitionBound> partitionUnits = <span class="code-keyword" style="color: #000091">new</span> ArrayList<>();
<span class="code-object" style="color: #910091">int</span> rowsPerPartition = SerializationUtil.parseIntegerParameter( ROWS_PER_PARTITION, serializedRowsPerPartition );
<span class="code-object" style="color: #910091">Object</span> lowerID = <span class="code-keyword" style="color: #000091">null</span>;
<span class="code-object" style="color: #910091">Object</span> upperID = <span class="code-keyword" style="color: #000091">null</span>;
<span class="code-keyword" style="color: #000091">while</span> ( scroll.scroll( rowsPerPartition ) ) {
lowerID = upperID;
upperID = scroll.get( 0 );
partitionUnits.add( <span class="code-keyword" style="color: #000091">new</span> PartitionBound( clazz, lowerID, upperID ) );
}
<span class="code-comment" style="color: #808080">// add an additional partition on the tail
</span> lowerID = upperID;
upperID = <span class="code-keyword" style="color: #000091">null</span>;
partitionUnits.add( <span class="code-keyword" style="color: #000091">new</span> PartitionBound( clazz, lowerID, upperID ) );
<span class="code-keyword" style="color: #000091">return</span> partitionUnits;
}
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The implementation of ScrollableResults we're using, <tt>org.hibernate.internal.ScrollableResultsImpl</tt>, starts positioned <b>before</b> the first element, so advancing 250 rows (for instance) will get us at the 250th element, which will be used as an upper bound for the first partition. The upper bound is excluded, thus the first partition will only include 249 elements, while the next partitions will include 250 elements.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Calling <tt>scroll.next()</tt> before the loop should do the trick.</p> </td>
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