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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37262] Write background index build tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-37262</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Write tests that confirm correct behavior when concurrent writes happen behind and ahead of collection scan cursor.&lt;/p&gt;</description>
                <environment></environment>
        <key id="608266">SERVER-37262</key>
            <summary>Write background index build tests</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Sep 2018 19:44:06 +0000</created>
                <updated>Tue, 18 Dec 2018 19:55:49 +0000</updated>
                            <resolved>Tue, 18 Dec 2018 19:55:49 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2094829" author="louis.williams" created="Tue, 18 Dec 2018 19:55:49 +0000"  >&lt;p&gt;Closing in favor of tests written for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38675&quot; title=&quot;Do not check duplicate key constraints for index builds on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38675&quot;&gt;&lt;del&gt;SERVER-38675&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38027&quot; title=&quot;Partially turn on hybrid index builds for background, non-unique indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38027&quot;&gt;&lt;del&gt;SERVER-38027&lt;/del&gt;&lt;/a&gt;, and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38036&quot; title=&quot;Turn on hybrid builds for background, unique indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38036&quot;&gt;&lt;del&gt;SERVER-38036&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2056464" author="daniel.gottlieb@10gen.com" created="Thu, 8 Nov 2018 20:06:09 +0000"  >&lt;p&gt;This ticket is to give confidence that inserts that can legally be missed by a table scanning cursor are correctly inserted into the &quot;side writes&quot; table. I don&apos;t believe any (current) implementations can naturally insert being a collection scanning cursor. One hack/trick that may make this testable for low-effort is to introduce a failpoint/test only server parameter that turns the record store table scan into a walk on the &lt;tt&gt;_id&lt;/tt&gt; index. The client performing writes concurrent to the index build can then choose a random &lt;tt&gt;_id&lt;/tt&gt; for performing inserts.&lt;/p&gt;</comment>
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