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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-78452] Implement missing index key check in dbCheck</title>
                <link>https://jira.mongodb.org/browse/SERVER-78452</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The DbCheckHasher class today implements the hashing logic for the data consistency check in dbCheck. Since it already has access to each document by walking the _id index, we will implement the missing index keys check within the DbCheckHasher.&lt;/p&gt;

&lt;p&gt;The algorithm for the missing index keys check will be:&lt;br/&gt;
*Primary iterates through record store at a given start point until it hits a batch boundary (total number of bytes/records limitation hit)&lt;br/&gt;
For each record traversed in batch and for each index that we are checking:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Fetch all index key entries corresponding to its index field values and record ID&lt;/li&gt;
	&lt;li&gt;Look up each of those index keys in the index table&lt;/li&gt;
	&lt;li&gt;If we do not find the index key entry, report the inconsistency to the health log&lt;/li&gt;
	&lt;li&gt;We will also verify that the document complies with index settings (for example, it does not have multiple index keys if the index is not multikey)&lt;/li&gt;
	&lt;li&gt;Add the size of the document and index keys to the total count of bytes. If we have exceeded a speed parameter, complete the batch and return&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;Secondaries will determine batch boundaries from an oplog entry that primary writes&lt;br/&gt;
This is currently already done by the DbCheckHasher&lt;/p&gt;</description>
                <environment></environment>
        <key id="2377311">SERVER-78452</key>
            <summary>Implement missing index key check in dbCheck</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="13201">Fixed</resolution>
                                        <assignee username="xuerui.fa@mongodb.com">Xuerui Fa</assignee>
                                    <reporter username="xuerui.fa@mongodb.com">Xuerui Fa</reporter>
                        <labels>
                            <label>pm-855-milestone-2</label>
                    </labels>
                <created>Mon, 26 Jun 2023 17:29:30 +0000</created>
                <updated>Wed, 1 Nov 2023 08:49:59 +0000</updated>
                            <resolved>Thu, 21 Sep 2023 00:56:12 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5719842" author="xgen-internal-githook" created="Thu, 21 Sep 2023 00:23:28 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;XueruiFa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;, &apos;username&apos;: &apos;XueruiFa&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78452&quot; title=&quot;Implement missing index key check in dbCheck&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78452&quot;&gt;&lt;del&gt;SERVER-78452&lt;/del&gt;&lt;/a&gt;: Implement missing key check in dbCheck&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/297c1abedbcec2ca416394244f09a8bfd8e4348c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/297c1abedbcec2ca416394244f09a8bfd8e4348c&lt;/a&gt;&lt;/p&gt;</comment>
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