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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-77703] Replace MurmurHash3 with absl::Hash if possible in oplog_applier_utils.cpp</title>
                <link>https://jira.mongodb.org/browse/SERVER-77703</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MurmurHash3 is a pretty old hash function that&apos;s slow and produces low-quality hashes compared to modern alternatives like absl::Hash (CityHash). We want to replace any uses of MurmurHash3 which are for in-memory use only, as we expect this to yield quick perf wins. Hash values that are persisted to disk across restarts or sent across the network between servers are likely unsafe to change, and should be annotated with a clear explanation for why the usage requires a stable hash computation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2356231">SERVER-77703</key>
            <summary>Replace MurmurHash3 with absl::Hash if possible in oplog_applier_utils.cpp</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="wenbin.zhu@mongodb.com">Wenbin Zhu</assignee>
                                    <reporter username="dan.larkin-york@mongodb.com">Dan Larkin-York</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Jun 2023 17:57:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:35 +0000</updated>
                            <resolved>Thu, 22 Jun 2023 15:38:29 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc6</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5519385" author="xgen-internal-githook" created="Thu, 22 Jun 2023 19:33:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77703&quot; title=&quot;Replace MurmurHash3 with absl::Hash if possible in oplog_applier_utils.cpp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77703&quot;&gt;&lt;del&gt;SERVER-77703&lt;/del&gt;&lt;/a&gt; Replace MurmurHash3 with absl::Hash when determining the ID of applier thread.&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/81bfc5c48d331e6aa84b07b3810595a0c3f6fcd0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/81bfc5c48d331e6aa84b07b3810595a0c3f6fcd0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5517322" author="xgen-internal-githook" created="Thu, 22 Jun 2023 03:46:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77703&quot; title=&quot;Replace MurmurHash3 with absl::Hash if possible in oplog_applier_utils.cpp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77703&quot;&gt;&lt;del&gt;SERVER-77703&lt;/del&gt;&lt;/a&gt; Replace MurmurHash3 with absl::Hash when determining the ID of applier thread.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b2c78aafaead96bdb826bf4a423214fe52f72804&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b2c78aafaead96bdb826bf4a423214fe52f72804&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5496591" author="JIRAUSER1258161" created="Tue, 13 Jun 2023 19:50:27 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler@mongodb.com&quot;&gt;blake.oler@mongodb.com&lt;/a&gt; It definitely depends on the size of the data being hashed. You can find some results for hashing field names of different lengths in &lt;a href=&quot;https://github.com/10gen/mongo/pull/13195&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this PR&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="2373783">SERVER-78302</issuekey>
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            <issuekey id="2369430">SERVER-78126</issuekey>
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