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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-7052] MongoS open one connection each primary per incoming connection</title>
                <link>https://jira.mongodb.org/browse/SERVER-7052</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Created after a discussion on the mailing list : &lt;a href=&quot;https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/qkiQmLDRuBA&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/qkiQmLDRuBA&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;For each incoming connection, mongoSs create a connection to each shard primary (and one to a secondary is using appropriate flag).&lt;/p&gt;

&lt;p&gt;This is really blocking for scalability since each primary will have as much as all incoming connection to the cluster.&lt;/p&gt;

&lt;p&gt;Usage of these connection really internal stuff and should (and could easily) be pooled.&lt;br/&gt;
Of course it reveals also that a primary is required for any kind of request.&lt;/p&gt;</description>
                <environment>All.</environment>
        <key id="50657">SERVER-7052</key>
            <summary>MongoS open one connection each primary per incoming connection</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="3">Duplicate</resolution>
                                        <assignee username="greg_10gen">Greg Studer</assignee>
                                    <reporter username="kamaradclimber">Gr&#233;goire Seux</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Sep 2012 11:13:21 +0000</created>
                <updated>Mon, 17 Sep 2012 14:58:24 +0000</updated>
                            <resolved>Mon, 17 Sep 2012 13:50:38 +0000</resolved>
                                    <version>2.0.6</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="164975" author="eliot" created="Mon, 17 Sep 2012 13:50:38 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6402&quot; title=&quot;Remove WriteBackListener entirely, replace with batched writes to shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6402&quot;&gt;&lt;del&gt;SERVER-6402&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Note, this does not mean that the primary is required for each op.&lt;/p&gt;</comment>
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