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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33316] Remove limit on number of locks a single operation can take</title>
                <link>https://jira.mongodb.org/browse/SERVER-33316</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="497591">SERVER-33316</key>
            <summary>Remove limit on number of locks a single operation can take</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Feb 2018 23:36:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:44 +0000</updated>
                            <resolved>Thu, 22 Mar 2018 19:51:25 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1842504" author="xgen-internal-githook" created="Thu, 22 Mar 2018 19:49:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;, &apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33316&quot; title=&quot;Remove limit on number of locks a single operation can take&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33316&quot;&gt;&lt;del&gt;SERVER-33316&lt;/del&gt;&lt;/a&gt; Remove limit on number of locks a single operation can take&lt;/p&gt;

&lt;p&gt;(Replaces the pre-allocated array in FastMapNoAlloc with a dynamic deque)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/379044733ab55adf136e7cbbff40a4b6b3b80931&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/379044733ab55adf136e7cbbff40a4b6b3b80931&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1833047" author="dianna.hohensee" created="Wed, 14 Mar 2018 01:29:29 +0000"  >&lt;p&gt;Plan: eliminate the pre-allocated size map of locks (FastMapNoAlloc). Replacing with plain vector of locks, pre-allocated with 16 entries, which can dynamically increase as needed for transactions.&lt;/p&gt;

&lt;p&gt;Update: that didn&apos;t work, because the LockManager maintains a list of pointers to the LockRequests held by the map of locks. This requires the map data structure to never invalidate pointers to its data: a vector will invalidate memory. Instead, we&apos;re swapping FastMapNoAlloc&apos;s array with a deque, which can add memory without invalidating pointers/references.&lt;/p&gt;</comment>
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            <issuekey id="514055">SERVER-34008</issuekey>
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