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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-2720" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-e21403bf-8827-43d6-8f3b-2c02152d8763" 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-2720" style="color: #3b73af; text-decoration: none">HSEARCH-2720</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-2720" style="color: #3b73af; text-decoration: none">JSR-352: The unnecessary customization of checkpoint algorithm</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"> <a class="user-hover" rel="mincong" id="email_mincong" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mincong" style="color:#6c797f;; color: #3b73af; text-decoration: none">Mincong HUANG</a> </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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<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"> 11/May/2017 12:24 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="mincong" id="email_mincong" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mincong" style="color:#6c797f;; color: #3b73af; text-decoration: none">Mincong HUANG</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">In JSR-352, a checkpoint algorithm is an algorithm which allows to customize the checkpoint policy for a chunk step. To achieve this, we can either specify the number of items to process per chunk when using the item checkpoint policy, or we can provide an implementation of interface <tt>javax.batch.api.chunk.CheckpointAlgorithm</tt> to benefit more customized checkpoint policy.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Current, we use the second approach: we provide an implementation of interface, called <tt>org.hibernate.search.jsr352.massindexing.impl.steps.lucene.CheckpointAlgorithm</tt>. However, this implementation is unnecessary, because our checkpoint policy is simple, the<br> checkpoint interval can be defined via attribute `item-count`, which accepts a Job Specification Language (JSL) expression, see Spec 1.0 - ยง8.2.1. Syntax:</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">
<chunk checkpoint-policy=<span class="code-quote" style="color: #009100">"{item|custom}"</span>
item-count=<span class="code-quote" style="color: #009100">"{value}"</span>
...
/>
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">So we can ask user to provide the value of checkpoint interval, and then fill it into the <tt>value</tt> of the example above using JSL. If user does not provide a value explicitly, then the default value will be applied.</p> </td>
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