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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-70200] Implement UUID::Hash using bytes from UUID instead of murmur3</title>
                <link>https://jira.mongodb.org/browse/SERVER-70200</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since UUIDs are themselves randomly generated, one alternative to generating a hash for an UUID with a traditional hash algorithm is to take 4 bytes from the UUID itself and use that as the Hash. Care would be taken to avoid copying over the portions of the UUID that are deterministically set.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2151158">SERVER-70200</key>
            <summary>Implement UUID::Hash using bytes from UUID instead of murmur3</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="damian.wasilewicz@mongodb.com">Damian Wasilewicz</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>techdebt</label>
                    </labels>
                <created>Tue, 4 Oct 2022 12:24:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:27 +0000</updated>
                            <resolved>Fri, 15 Sep 2023 16:12:08 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5707631" author="xgen-internal-githook" created="Fri, 15 Sep 2023 16:09:23 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Damian Wasilewicz&apos;, &apos;email&apos;: &apos;damian.wasilewicz@mongodb.com&apos;, &apos;username&apos;: &apos;DamianWasilewicz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70200&quot; title=&quot;Implement UUID::Hash using bytes from UUID instead of murmur3&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70200&quot;&gt;&lt;del&gt;SERVER-70200&lt;/del&gt;&lt;/a&gt; Change UUID hash function to use bytes from UUID&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4b1f548254331698222b77b9c80959cee8abd0bf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4b1f548254331698222b77b9c80959cee8abd0bf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5688140" author="JIRAUSER1269484" created="Thu, 7 Sep 2023 20:51:21 +0000"  >&lt;p&gt;The original ticket was to change the UUID::Hash function from murmur to absl hash, but since most of the bytes in the UUID are themselves randomly generated, it might be faster to directly use a few of these bytes as the hash rather than running a hash algorithm.&lt;/p&gt;</comment>
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