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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84080] Replace hash table with new model for greater fine grained locks</title>
                <link>https://jira.mongodb.org/browse/SERVER-84080</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Improve current hashing mechanism to allow for fine grained locks along the lines of Oracle&#8217;s Latching, RBS and redo logs mechanism allowing higher concurrency through non-blocking reads when write is required.&lt;/p&gt;

&lt;p&gt;*Sample papers reviewed by Performance Engineering.&lt;br/&gt;
growt (GrowTable) is a header only library implementing a concurrent growing hash table&lt;br/&gt;
&lt;a href=&quot;https://github.com/TooBiased/growt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/TooBiased/growt&lt;/a&gt;&lt;br/&gt;
parlayhash : A Header Only Fast Concurrent Hash Table.&lt;br/&gt;
&lt;a href=&quot;https://github.com/cmuparlay/parlayhash/tree/main&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/cmuparlay/parlayhash/tree/main&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Other Hash  Tables&lt;br/&gt;
&lt;a href=&quot;https://github.com/BlazingPhoenix/concurrent-hash-map&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/BlazingPhoenix/concurrent-hash-map&lt;/a&gt; (libcuckoo)&lt;br/&gt;
&lt;a href=&quot;https://github.com/GLaDOS-418/threading_library&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/GLaDOS-418/threading_library&lt;/a&gt; - sharded locks&lt;/p&gt;

&lt;p&gt;Papers:&lt;br/&gt;
&lt;a href=&quot;https://www.cs.princeton.edu/~mfreed/docs/cuckoo-eurosys14.pdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.cs.princeton.edu/~mfreed/docs/cuckoo-eurosys14.pdf&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://www.liblfds.org/downloads/white%20papers/[Hash]%20-%20[Michael]%20-%20High%20Performance%20Dynamic%20Lock-Free%20Hash%20Tables%20and%20List-Based%20Sets.pdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.liblfds.org/downloads/white%20papers/[Hash]%20-%20[Michael]%20-%20High%20Performance%20Dynamic%20Lock-Free%20Hash%20Tables%20and%20List-Based%20Sets.pdf&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://erdani.org/publications/cuj-2004-12.pdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://erdani.org/publications/cuj-2004-12.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Other&lt;br/&gt;
&lt;a href=&quot;https://github.com/cmuparlay/concurrent_deferred_rc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/cmuparlay/concurrent_deferred_rc&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/cmuparlay/parlaylib&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/cmuparlay/parlaylib&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://www.liblfds.org/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.liblfds.org/&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2473181">SERVER-84080</key>
            <summary>Replace hash table with new model for greater fine grained locks</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-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="francisco.casas@mongodb.com">Francisco Casas</reporter>
                        <labels>
                            <label>perf</label>
                    </labels>
                <created>Thu, 12 Oct 2023 21:20:15 +0000</created>
                <updated>Tue, 19 Dec 2023 21:06:47 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5961303" author="jason.chan" created="Tue, 19 Dec 2023 21:06:40 +0000"  >&lt;p&gt;We think the motivations of this ticket is similar to PM-3089. Putting this ticket in the backlog for now to see if we want to revisit the hash table performance evaluation here.&lt;/p&gt;</comment>
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