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    <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-34739] Change the default to 1 for the task executor pool</title>
                <link>https://jira.mongodb.org/browse/SERVER-34739</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;</description>
                <environment></environment>
        <key id="535468">SERVER-34739</key>
            <summary>Change the default to 1 for the task executor pool</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Apr 2018 23:41:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:15 +0000</updated>
                            <resolved>Fri, 27 Apr 2018 23:55:02 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1876806" author="xgen-internal-githook" created="Fri, 27 Apr 2018 23:54:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;username&apos;: &apos;hanumantmk&apos;, &apos;name&apos;: &apos;Jason Carey&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34739&quot; title=&quot;Change the default to 1 for the task executor pool&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34739&quot;&gt;&lt;del&gt;SERVER-34739&lt;/del&gt;&lt;/a&gt; Migrate to 1 connpool in ARS&lt;/p&gt;

&lt;p&gt;Migrate to 1 connection pool in mongos.&lt;/p&gt;

&lt;p&gt;This change involves the introduction of a transport layer baton, which&lt;br/&gt;
improves perf for a particular transport layer when doing local&lt;br/&gt;
scatter/gather operations.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4ddf18bcf4d517c3dc0f005f9222ffaab9a86ffa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4ddf18bcf4d517c3dc0f005f9222ffaab9a86ffa&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
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                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="542839">DOCS-11693</issuekey>
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            <issuekey id="369693">SERVER-28568</issuekey>
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            <issuelink>
            <issuekey id="471221">SERVER-32270</issuekey>
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            <issuelink>
            <issuekey id="485036">SERVER-32801</issuekey>
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