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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-49103] Validate repair mode should fix up missing and extra index entries</title>
                <link>https://jira.mongodb.org/browse/SERVER-49103</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As a part of collection validation, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5fd5cb9804ac75e5d448b789a3c81a1e167980f3/src/mongo/db/catalog/collection_validation.cpp#L543&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;gather index entry errors&lt;/a&gt; for error reporting purposes.&lt;/p&gt;

&lt;p&gt;Since we always assume the collection data is a source of truth, during --repair we can use this information to fix up indexes without requiring a full index rebuild.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1392352">SERVER-49103</key>
            <summary>Validate repair mode should fix up missing and extra index entries</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="shinyee.tan@mongodb.com">Shin Yee Tan</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Jun 2020 17:37:27 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:30 +0000</updated>
                            <resolved>Thu, 6 Aug 2020 01:27:55 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3323822" author="xgen-internal-githook" created="Thu, 6 Aug 2020 00:03:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Shin Yee Tan&apos;, &apos;email&apos;: &apos;shinyee.tan@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49103&quot; title=&quot;Validate repair mode should fix up missing and extra index entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49103&quot;&gt;&lt;del&gt;SERVER-49103&lt;/del&gt;&lt;/a&gt; Validate repair mode should fix up missing and extra index entries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/84ae2755904df75ea8ab79e0595227b04bf02251&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/84ae2755904df75ea8ab79e0595227b04bf02251&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3225714" author="louis.williams" created="Fri, 26 Jun 2020 14:40:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;, good point. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39562&quot; title=&quot;Repair should handle duplicate unique index keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39562&quot;&gt;&lt;del&gt;SERVER-39562&lt;/del&gt;&lt;/a&gt; is intended to specifically address the unique key problem, however, I suspect that these two tickets will have some overlap.&lt;/p&gt;</comment>
                            <comment id="3225696" author="daniel.gottlieb@10gen.com" created="Fri, 26 Jun 2020 14:36:42 +0000"  >&lt;p&gt;Possible edge case: there are times where the collection data is wrong, e.g: multiple documents with the same &lt;tt&gt;_id&lt;/tt&gt;. If failing to handle that case leads to a crash because of a duplicate key exception (as we&apos;ve seen during replication recovery when there&apos;s index/collection inconsistency), that would make &lt;tt&gt;&amp;#45;&amp;#45;repair&lt;/tt&gt; less robust.&lt;/p&gt;

&lt;p&gt;Then again, I&apos;m not sure if the current &lt;tt&gt;&amp;#45;&amp;#45;repair&lt;/tt&gt; semantics to rebuild the &lt;tt&gt;_id&lt;/tt&gt; and other unique indexes are robust to that today.&lt;/p&gt;</comment>
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