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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>[SERVER-26720] Need to prepare initial connection between mongos and mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-26720</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After looking source code and some testing, &lt;br/&gt;
I have recognized that mongos does not prepare connection to mongod even though mongo client connector established connections(between client drivers and mongos).&lt;/p&gt;

&lt;p&gt;But this is a little bit risky at service starting time.&lt;br/&gt;
Usually service starting time, huge user requests are transmitted to mongod via mongos. But this time, there&apos;s no connections are established between mongos and mongod. To make things worse, mongos need to open connections for all mongod shards and need to authenticate for user.&lt;/p&gt;

&lt;p&gt;These overheads cause connection spike at service starting time. (Look at the attached mongod connections metric graphs). In this test, there&apos;s only 14 mongos, But some service need to run 150 mongos. &lt;/p&gt;

&lt;p&gt;If there&apos;s 150 mongos, connections of each mongod shard is spike to 30000.  In this case, mongod server can&apos;t processing user request because mongod  is too busy to open and close connection. Eventually mongod servers are hang.&lt;/p&gt;

&lt;p&gt;So I think there&apos;s some preparation of connections between mongos and mongod. In current version, there&apos;s no way to control connections before running query.&lt;/p&gt;</description>
                <environment></environment>
        <key id="325798">SERVER-26720</key>
            <summary>Need to prepare initial connection between mongos and mongod</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="sunguck.lee@gmail.com">&#50500;&#45208; &#54616;&#47532;</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Oct 2016 07:12:20 +0000</created>
                <updated>Mon, 22 Jan 2024 21:12:17 +0000</updated>
                                            <version>3.2.10</version>
                                                    <component>Networking</component>
                                        <votes>1</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="4178781" author="JIRAUSER1262719" created="Tue, 9 Nov 2021 20:28:47 +0000"  >&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to close this ticket. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="142055" name="ConnectionSpike.png" size="42012" author="matt.lee" created="Fri, 21 Oct 2016 07:12:20 +0000"/>
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