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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-55800] Reduce the number of futures in command execution path</title>
                <link>https://jira.mongodb.org/browse/SERVER-55800</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Constructing a new future (i.e., an instance of &lt;tt&gt;Future&lt;/tt&gt;, &lt;tt&gt;SemiFuture&lt;/tt&gt; and &lt;tt&gt;ExecutorFuture&lt;/tt&gt;) is not cheap and imposes some cost both at its construction and destruction. Some of this cost is attributed to heap-allocations and known inefficiencies of releasing memory allocated by other threads.&lt;/p&gt;

&lt;p&gt;We can reduce the number of futures constructed in the command execution path, by merging continuations and changing blocking functions to return basic types instead of values wrapped in futures. This transition could help with reducing the latency of command execution.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1671392">SERVER-55800</key>
            <summary>Reduce the number of futures in command execution path</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="13201">Fixed</resolution>
                                        <assignee username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                            <label>post-rc0</label>
                    </labels>
                <created>Mon, 5 Apr 2021 21:20:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:19 +0000</updated>
                            <resolved>Fri, 21 May 2021 21:09:52 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3806721" author="xgen-internal-githook" created="Fri, 21 May 2021 20:17:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55800&quot; title=&quot;Reduce the number of futures in command execution path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55800&quot;&gt;&lt;del&gt;SERVER-55800&lt;/del&gt;&lt;/a&gt; Reduce the number of futures in executeCommand&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit fb92ba9cf474f28f6c77b230018a6d30242143dc.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f522af24c8cc07bdb4d2437074e9d8b3e01a880e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f522af24c8cc07bdb4d2437074e9d8b3e01a880e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3793356" author="xgen-internal-githook" created="Wed, 19 May 2021 22:43:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55800&quot; title=&quot;Reduce the number of futures in command execution path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55800&quot;&gt;&lt;del&gt;SERVER-55800&lt;/del&gt;&lt;/a&gt; Reduce the number of futures in executeCommand&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fb92ba9cf474f28f6c77b230018a6d30242143dc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fb92ba9cf474f28f6c77b230018a6d30242143dc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3733134" author="xgen-internal-githook" created="Thu, 22 Apr 2021 14:40:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55800&quot; title=&quot;Reduce the number of futures in command execution path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55800&quot;&gt;&lt;del&gt;SERVER-55800&lt;/del&gt;&lt;/a&gt; Reduce the number of futures in handleRequest&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8a5e39208e621c28985d37d2655bf9d87bf23f92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8a5e39208e621c28985d37d2655bf9d87bf23f92&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1634408">SERVER-54804</issuekey>
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                                        <issuelink>
            <issuekey id="1745304">SERVER-57137</issuekey>
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