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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-85200] Fix hashing batch bounds for extra index keys check</title>
                <link>https://jira.mongodb.org/browse/SERVER-85200</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I noticed this bug out of a separate issue in BF-31124. In &lt;a href=&quot;https://parsley.mongodb.com/resmoke/ab7714e4798c78213ef8ac948f169656/test/179ff7ba730a5d35c5e2faf3cc076fe1?bookmarks=0,50415,50421,50862,50940,50941,50942,50946,50968,51062,51068,51069,51070,51071,51073,52253,52355,52376,52419,52422,149658,150652,150653,153449&amp;amp;shareLine=51073&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this patch&lt;/a&gt;, the batch sizes logged are all 4, when they should be 99. From code inspection I think the error is from &lt;a href=&quot;#L1161&quot; target=&quot;_blank&quot; rel=&quot;noopener&quot;&gt;herehttps://github.com/10gen/mongo/blob/37501b2150baea9d055f1ab8477e06352eb12a85/src/mongo/db/commands/dbcheck_command.cpp#L1161&lt;/a&gt; when we update &lt;tt&gt;batchStats.firstIndexKey = firstKeyString&lt;/tt&gt;. However if there are multiple snapshots within a batch we end up doing this for each snapshot, so the firstIndexKey ends up getting updated to be the first index key of the last snapshot in the batch. This is a problem because when we hash the keys we&apos;ll then &lt;a href=&quot;https://github.com/10gen/mongo/blob/37501b2150baea9d055f1ab8477e06352eb12a85/src/mongo/db/commands/dbcheck_command.cpp#L752&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;only hash the last snapshot&lt;/a&gt;. We should fix this by updating the first of the batch vs the first of the snapshot separately.&lt;/p&gt;

&lt;p&gt;We should also change &lt;a href=&quot;https://github.com/10gen/mongo/blob/37501b2150baea9d055f1ab8477e06352eb12a85/src/mongo/db/commands/dbcheck_command.cpp#L1111&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this log line&lt;/a&gt; to instead say &quot;started extra index keys snapshot&quot;&lt;/p&gt;

&lt;p&gt;To catch this bug we should add a complete coverage test similar to the one that exists for collection check &lt;a href=&quot;https://github.com/10gen/mongo/blob/37501b2150baea9d055f1ab8477e06352eb12a85/jstests/replsets/dbcheck.js#L86-L100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; for extra index keys as well&lt;/p&gt;</description>
                <environment></environment>
        <key id="2544855">SERVER-85200</key>
            <summary>Fix hashing batch bounds for extra index keys check</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="xuerui.fa@mongodb.com">Xuerui Fa</assignee>
                                    <reporter username="huayu.ouyang@mongodb.com">Huayu Ouyang</reporter>
                        <labels>
                            <label>pm-855-milestone-2</label>
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                <created>Fri, 12 Jan 2024 21:10:34 +0000</created>
                <updated>Mon, 5 Feb 2024 17:16:43 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
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