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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68740] Non-default-seeded hashed indexes not working correctly since 2.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-68740</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We introduced hashed indexes in 2.4, where we could take an option &lt;tt&gt;seed&lt;/tt&gt;&#160;to compute the hash and it worked accordingly. Since 2.6, we computed the hashes for the keystrings using the non-default&#160;&lt;tt&gt;seed&lt;/tt&gt;&#160;as expected, but when running the query we incorrectly used the default hash key. (The code hasn&#8217;t been really changed and here&#8217;s the link to them on master:&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/e9fa2af5fced31c35b4e1106fe71792a371ca660/src/mongo/db/index/expression_keys_private.cpp#L661&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;insert&lt;/a&gt;,&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/e9fa2af5fced31c35b4e1106fe71792a371ca660/src/mongo/db/query/expression_index.cpp#L55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;query&lt;/a&gt;) Starting from 3.4, we disallowed users to pass the&#160;&lt;tt&gt;seed&lt;/tt&gt;&#160;option. This option would never be touched throughout upgrades. After 5.0, it will be automatically skipped when calling&#160;&lt;tt&gt;listIndexes&lt;/tt&gt;. The validate command can detect this disallowed field on disk, and users can use&#160;&lt;tt&gt;collMod&lt;/tt&gt; to remove it from the catalog. Also, it doesn&apos;t seem to have any documentation of the &lt;tt&gt;seed&lt;/tt&gt; field, not even on 2.4 where we introduced it.&lt;/p&gt;

&lt;p&gt;Since we haven&apos;t really got any complaints from our users, I&apos;m not sure if we would want to implement any fix at all to make the non-default seeded indexes to work correctly. On the other hand, we may want to consider removing the code handling the non-default seed on master.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2111710">SERVER-68740</key>
            <summary>Non-default-seeded hashed indexes not working correctly since 2.6</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="yuhong.zhang@mongodb.com">Yuhong Zhang</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Aug 2022 15:49:13 +0000</created>
                <updated>Mon, 17 Jul 2023 18:58:57 +0000</updated>
                            <resolved>Mon, 17 Jul 2023 18:58:57 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
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            <issuekey id="2099440">SERVER-68309</issuekey>
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