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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-62311] Validation can report false positive results when a hash collision happens</title>
                <link>https://jira.mongodb.org/browse/SERVER-62311</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We reduced the chance of hash collision in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48528&quot; title=&quot;ValidateTests can fail sporadically due to KeyString hashing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48528&quot;&gt;&lt;del&gt;SERVER-48528&lt;/del&gt;&lt;/a&gt; by using more bits. However, when one of the two hashes collides, we can still report wrong validation errors.&lt;/p&gt;

&lt;p&gt;For example, the collection has a record &lt;tt&gt;r1&lt;/tt&gt;&#160;and a matching index entry with hashes {h1, h2}. There is also an extra index entry without a matching record &lt;tt&gt;r2&lt;/tt&gt;&#160;with the hashes {h1, h3}. As a result, we will have both bucket h1 and h3 with non-zero values. The second phase in IndexConsistency::addDocKey() will think that &lt;tt&gt;r1&lt;/tt&gt; has a missing index entry since bucket h1 is non-zero.&lt;/p&gt;

&lt;p&gt;We may solve the problem by storing &lt;tt&gt;indexKeyCount&lt;/tt&gt; as signed integers within &lt;tt&gt;IndexKeyBucket&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1957020">SERVER-62311</key>
            <summary>Validation can report false positive results when a hash collision happens</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="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="12300">Won&apos;t Do</resolution>
                                        <assignee username="yuhong.zhang@mongodb.com">Yuhong Zhang</assignee>
                                    <reporter username="yuhong.zhang@mongodb.com">Yuhong Zhang</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Dec 2021 19:39:54 +0000</created>
                <updated>Sat, 26 Feb 2022 22:52:20 +0000</updated>
                            <resolved>Sat, 26 Feb 2022 22:52:20 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4378938" author="JIRAUSER1253424" created="Sat, 26 Feb 2022 22:51:37 +0000"  >&lt;p&gt;The problem described in the ticket should already be handled. The linked BF&apos;s log is expired so it&apos;s unclear what the actual problem was. Closing the ticket.&lt;/p&gt;</comment>
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