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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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            <title>[SERVER-38502] Draining of the index build&apos;s constraint violations entries should be: read, check, delete entry</title>
                <link>https://jira.mongodb.org/browse/SERVER-38502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to survive server restart during an index build&apos;s constraint violations checking phase, each entry in the constraints table must be read and then checked, and only then deleted. Currently (I believe?), each entry is read, deleted then checked, which is not recoverable.&lt;/p&gt;

&lt;p&gt;Simultaneous index builds on secondaries can potentially wait a long while between building the index (scanning, writing) and performing constraint checking. It&apos;s therefore desirable to make the constraint checking phase resumable after server restart, to avoid restarting the entire index build.&lt;/p&gt;

&lt;p&gt;This is technically an optimization. It will be required, however, if we ever make index builds entirely recoverable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="648871">SERVER-38502</key>
            <summary>Draining of the index build&apos;s constraint violations entries should be: read, check, delete entry</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Dec 2018 16:08:27 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:08 +0000</updated>
                            <resolved>Fri, 4 Jan 2019 01:29:46 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2105088" author="daniel.gottlieb@10gen.com" created="Fri, 4 Jan 2019 01:29:46 +0000"  >&lt;p&gt;Resolving as gone away with &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;. When this ticket was created, constraint checking did not remove entries. That was recoverable, but not efficient. &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; changed constraint checking to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/63af6676e353eafa00b6178737085606836e6139/src/mongo/db/index/duplicate_key_tracker.cpp#L117-L125&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;delete entries as it went along&lt;/a&gt;, in the order this ticket describes.&lt;/p&gt;</comment>
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