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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-11693] Docs for SERVER-34739: Change the default to 1 for the task executor pool</title>
                <link>https://jira.mongodb.org/browse/DOCS-11693</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description:&lt;/h2&gt;

&lt;p&gt;This changes the taskExecutorPoolSize server param to 1 (from the current default of 0, which implies 4 &amp;lt;= NUM_CORES &amp;lt;= 64 egress connection pools on a mongos).&lt;/p&gt;

&lt;p&gt;It also introduces AsyncRequestsSenderUseBaton, which is a true by default boolean server parameter which controls a targetted linux only performance optimization. Old behavior can be restored by setting taskExecutorPoolSize=0 and AsyncRequestsSenderUseBaton=false.&lt;/p&gt;

&lt;p&gt;Windows and os x constrain the pool size without any os specific performance optimization (so may need the above values altered if a perf regression is detected)&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%3A&quot;&gt;&lt;/a&gt;Scope of changes:&lt;/h2&gt;

&lt;ul&gt;
	&lt;li&gt;parameters&lt;/li&gt;
	&lt;li&gt;4.0&lt;/li&gt;
	&lt;li&gt;4.0-compatibility&lt;/li&gt;
	&lt;li&gt;connPoolStats output&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct%3A&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%3A&quot;&gt;&lt;/a&gt;MVP:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%3A&quot;&gt;&lt;/a&gt;Resources:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h2&gt;

&lt;p&gt;This changes the default to 1 for the task executor pool (meaning we also have 1 egress connection pool for user operations in mongos).&lt;/p&gt;

&lt;p&gt;In order to mitigate the performance hit, a targetted optimization has been added for linux which uses client-thread based polling in the ARS.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%3A&quot;&gt;&lt;/a&gt;Scope of changes:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct%3A&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%3A&quot;&gt;&lt;/a&gt;MVP:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%3A&quot;&gt;&lt;/a&gt;Resources:&lt;/h2&gt;</description>
                <environment></environment>
        <key id="542839">DOCS-11693</key>
            <summary>Docs for SERVER-34739: Change the default to 1 for the task executor pool</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 May 2018 21:37:16 +0000</created>
                <updated>Sun, 29 Oct 2023 13:57:52 +0000</updated>
                            <resolved>Tue, 5 Jun 2018 19:54:44 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3942853" author="JIRAUSER1261184" created="Thu, 15 Jul 2021 07:09:17 +0000"  >&lt;p&gt;But if I set&#160;AsyncRequestsSenderUseBaton in configure,the server can not start. I can&apos;t get it in 4.4 version code.&lt;/p&gt;</comment>
                            <comment id="1911689" author="xgen-internal-githook" created="Tue, 5 Jun 2018 19:54:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;kay-kim&apos;, &apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11693&quot; title=&quot;Docs for SERVER-34739: Change the default to 1 for the task executor pool&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11693&quot;&gt;&lt;del&gt;DOCS-11693&lt;/del&gt;&lt;/a&gt;: taskExecutorPoolSize default 1 and syncRequestsSenderUseBaton&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/273766aa7483be0676d9bda23ac3001a25998a4e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/273766aa7483be0676d9bda23ac3001a25998a4e&lt;/a&gt;&lt;/p&gt;</comment>
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