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    <description>This file is an XML representation of an issue</description>
    <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-82618] Replace usages of absl::hash_internal</title>
                <link>https://jira.mongodb.org/browse/SERVER-82618</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In some places where we want a modern hash, we use CityHash.&lt;/p&gt;

&lt;p&gt;The implementation we use is lifted from absl::hash_internal::CityHash and we use it in several places:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/search?q=repo%3Amongodb%2Fmongo%20absl%3A%3Ahash_internal&amp;amp;type=code&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/search?q=repo%3Amongodb%2Fmongo%20absl%3A%3Ahash_internal&amp;amp;type=code&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;abseil explicitly ask users not to depend on anything with the word internal in it: &lt;a href=&quot;https://abseil.io/about/compatibility#c-symbols-and-files&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://abseil.io/about/compatibility#c-symbols-and-files&lt;/a&gt;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;b&gt;Do not depend upon internal details.&lt;/b&gt;&#160;If something is in a namespace, file, directory, or simply contains the string&#160;&lt;tt&gt;internal&lt;/tt&gt;,&#160;&lt;tt&gt;impl&lt;/tt&gt;,&#160;&lt;tt&gt;test&lt;/tt&gt;,&#160;&lt;tt&gt;detail&lt;/tt&gt;,&#160;&lt;tt&gt;benchmark&lt;/tt&gt;,&#160;&lt;tt&gt;sample&lt;/tt&gt;, or&#160;&lt;tt&gt;example&lt;/tt&gt;, unless it is explicitly called out, it is not part of the public API. It&#8217;s an implementation detail. You cannot friend it, you cannot include it, you cannot mention it or refer to it in any way.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This may complicate stuff when we upgrade absl version and CityHash is replaced with some other hash function.&lt;/p&gt;

&lt;p&gt;If we want to use it, we have several options:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;We can use &lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/blob/9292d8678913e9bf134e01ad2d4c53a16765234a/src/include/extern.h#L1812&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WiredTiger&apos;s implementation&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;We can vendor &lt;a href=&quot;https://github.com/google/cityhash&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CityHash&lt;/a&gt; separately (I am not sure if this is the best repo for it)&lt;/li&gt;
	&lt;li&gt;We can consider switching to more modern hash function, like &lt;a href=&quot;https://github.com/Cyan4973/xxHash&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;xxHash&lt;/a&gt; that uses SIMD.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2486536">SERVER-82618</key>
            <summary>Replace usages of absl::hash_internal</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Oct 2023 14:40:37 +0000</created>
                <updated>Tue, 28 Nov 2023 10:10:09 +0000</updated>
                                                                                                <votes>2</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5889414" author="JIRAUSER1275179" created="Fri, 17 Nov 2023 21:24:46 +0000"  >&lt;p&gt;Given there are call sites in key string and lock manager, we are passing this to storage execution&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2356218">SERVER-77698</issuekey>
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            <issuekey id="2506890">SERVER-83522</issuekey>
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