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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-22839] Replace the hashing function for StringData</title>
                <link>https://jira.mongodb.org/browse/SERVER-22839</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;StringData uses murmurhash for it&apos;s hashing function.  On 32 bit systems it returns a little endian decoded uint32_t of the 32 bit hash output.  On 64 bit systems it returns a little endian decoded uint64_t of the 128 bit hash output.&lt;/p&gt;

&lt;p&gt;We should pick something better than murmur, cityhash perhaps (then we could pick something better and stop generating 128 bits of hash only to throw half of it away)&lt;/p&gt;</description>
                <environment></environment>
        <key id="267794">SERVER-22839</key>
            <summary>Replace the hashing function for StringData</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="9">Done</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Feb 2016 19:19:20 +0000</created>
                <updated>Mon, 26 Aug 2019 17:15:42 +0000</updated>
                            <resolved>Mon, 26 Aug 2019 17:15:42 +0000</resolved>
                                    <version>3.3.2</version>
                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2386919" author="billy.donahue" created="Mon, 26 Aug 2019 17:15:42 +0000"  >&lt;p&gt;This is an old ticket and it looks like StringData doesn&apos;t hash itself anymore. Maybe an obsolete concern? Reopen if I&apos;m missing something here.&lt;/p&gt;</comment>
                            <comment id="1183621" author="adam.midvidy" created="Wed, 24 Feb 2016 20:06:23 +0000"  >&lt;p&gt;wiredtiger already has a cityhash implementation, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f950ac39aeea87cd64f5832b2d5fab451f220b58/src/third_party/wiredtiger/src/support/hash_city.c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/f950ac39aeea87cd64f5832b2d5fab451f220b58/src/third_party/wiredtiger/src/support/hash_city.c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1183602" author="jason.carey" created="Wed, 24 Feb 2016 19:52:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=redbeard0531&quot; class=&quot;user-hover&quot; rel=&quot;redbeard0531&quot;&gt;redbeard0531&lt;/a&gt;, you&apos;d mentioned wanting to consider other hashes.  Did you have any workloads in mind where the hashing function might make a difference?&lt;/p&gt;</comment>
                            <comment id="1183598" author="schwerin" created="Wed, 24 Feb 2016 19:49:13 +0000"  >&lt;p&gt;I don&apos;t really see a problem with having extra intermediate state while computing the hash, and I don&apos;t really care about the endianness of the output hash except as we have to clean up to work on big-endian systems. There&apos;s nothing wrong per se with switching hash functions, but are we going to receive observable benefits?&lt;/p&gt;</comment>
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