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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>[DOCS-924] Docs on &apos;mongos&apos; connections don&apos;t make sense</title>
                <link>https://jira.mongodb.org/browse/DOCS-924</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;This makes no sense:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Typically, each client maintains as connection to mongos. mongos maintains a connection pool to support a single outgoing connection to each shard for. &lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;This sort of makes sense, but could be made clearer&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;For incoming connections that direct read operations to secondaries, the mongos will also need to maintain connects to each member of the replica set that provides the shard.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment>&lt;a href=&quot;http://docs.mongodb.org/manual/faq/sharding/#how-many-connections-does-each-mongos-need&quot;&gt;http://docs.mongodb.org/manual/faq/sharding/#how-many-connections-does-each-mongos-need&lt;/a&gt;</environment>
        <key id="60188">DOCS-924</key>
            <summary>Docs on &apos;mongos&apos; connections don&apos;t make sense</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="9">Done</resolution>
                                        <assignee username="epc">Ed Costello</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Dec 2012 22:35:39 +0000</created>
                <updated>Mon, 15 Apr 2013 22:25:55 +0000</updated>
                            <resolved>Mon, 7 Jan 2013 17:56:57 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="278117" author="auto" created="Thu, 28 Feb 2013 14:43:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-27T21:09:41Z&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-924&quot; title=&quot;Docs on &amp;#39;mongos&amp;#39; connections don&amp;#39;t make sense&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-924&quot;&gt;&lt;del&gt;DOCS-924&lt;/del&gt;&lt;/a&gt;: removing comment blocks from 2.4 feature&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b8cdc931407de8107fa3889050cd8a8e9f439b71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b8cdc931407de8107fa3889050cd8a8e9f439b71&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="233296" author="auto" created="Mon, 7 Jan 2013 17:57:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-07T17:56:47Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-924&quot; title=&quot;Docs on &amp;#39;mongos&amp;#39; connections don&amp;#39;t make sense&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-924&quot;&gt;&lt;del&gt;DOCS-924&lt;/del&gt;&lt;/a&gt; adding ulimit and rewording question&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b58859943597861389cddd95009e5e076004b0cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b58859943597861389cddd95009e5e076004b0cc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="233292" author="samk" created="Mon, 7 Jan 2013 17:55:19 +0000"  >&lt;p&gt;I added a cross reference to the relevant section on the ulimit page, which is the correct place for this information...&lt;/p&gt;</comment>
                            <comment id="233286" author="auto" created="Mon, 7 Jan 2013 17:45:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-07T17:43:55Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-924&quot; title=&quot;Docs on &amp;#39;mongos&amp;#39; connections don&amp;#39;t make sense&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-924&quot;&gt;&lt;del&gt;DOCS-924&lt;/del&gt;&lt;/a&gt;: clarifiy connection pooling faq&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a11d9ae6a441fc9e2037cb0937a26a488e68a757&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a11d9ae6a441fc9e2037cb0937a26a488e68a757&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="231437" author="william.zola@10gen.com" created="Sat, 5 Jan 2013 00:30:58 +0000"  >&lt;p&gt;For what it&apos;s worth, the current text does not answer the question &quot;How many connections does &apos;mongos&apos; need?&quot;.&lt;/p&gt;

&lt;p&gt;The answer is:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;One connection to each node in all of the shards&lt;/li&gt;
	&lt;li&gt;One incoming connection from each incoming client&lt;/li&gt;
	&lt;li&gt;Up to (NUM_INCOMING * NUM_NODES) outgoing connections to handle the operations requested by the incoming connections&lt;/li&gt;
	&lt;li&gt;The actual number of outgoing connections to the shard nodes may be fewer, based on the composition of the incoming requests&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="231316" author="auto" created="Fri, 4 Jan 2013 22:44:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-04T22:41:00Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: merge: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-924&quot; title=&quot;Docs on &amp;#39;mongos&amp;#39; connections don&amp;#39;t make sense&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-924&quot;&gt;&lt;del&gt;DOCS-924&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/05d38aaa22ad42dfaf3183865fb46130c5f57890&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/05d38aaa22ad42dfaf3183865fb46130c5f57890&lt;/a&gt;&lt;/p&gt;</comment>
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