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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-11624] Update atlas mongos configuration docs</title>
                <link>https://jira.mongodb.org/browse/DOCS-11624</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://docs.atlas.mongodb.com/create-new-cluster/#scale-your-replica-set-to-a-sharded-cluster&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.atlas.mongodb.com/create-new-cluster/#scale-your-replica-set-to-a-sharded-cluster&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;Atlas deploys six routers (mongos programs) for a sharded cluster. Atlas runs the routers on the shard servers. For cross-region clusters, Atlas spreads the routers across the selected regions.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This is no longer true.  Atlas deploys a mongos on every shard server.  This allows us to have geo-affinity to mongos from user applications from whichever region they are in.&lt;/p&gt;

&lt;p&gt;When connecting from a driver, all mongos are included in the connection string. When connecting from the shell, only the first mongos is &lt;del&gt;returned&lt;/del&gt; displayed.&lt;/p&gt;

&lt;p&gt;cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cory.mintz&quot; class=&quot;user-hover&quot; rel=&quot;cory.mintz&quot;&gt;cory.mintz&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="527510">DOCS-11624</key>
            <summary>Update atlas mongos configuration docs</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="ravind.kumar">Ravind Kumar</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Apr 2018 14:57:07 +0000</created>
                <updated>Fri, 8 Jun 2018 19:39:22 +0000</updated>
                            <resolved>Fri, 20 Apr 2018 15:05:53 +0000</resolved>
                                                                    <component>Atlas</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1870086" author="ravind.kumar" created="Fri, 20 Apr 2018 15:05:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/cloud-docs/commit/bbdb956e4bedbda0b2f825f5f7af2b6ec3ca9424&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;merged&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1867767" author="ravind.kumar" created="Wed, 18 Apr 2018 16:06:25 +0000"  >&lt;p&gt;AH, I misread. This makes sense, thanks!&lt;/p&gt;</comment>
                            <comment id="1867730" author="cory.mintz@10gen.com" created="Wed, 18 Apr 2018 15:46:08 +0000"  >&lt;p&gt;No, there is one on every server. NumShards * ReplicationFactor.&lt;/p&gt;</comment>
                            <comment id="1867729" author="dan@10gen.com" created="Wed, 18 Apr 2018 15:45:37 +0000"  >&lt;blockquote&gt;&lt;p&gt;Dan Pasette Cory Mintz is this to say that the number of `mongos` instances is now equal to the number of shards in your sharded cluster?&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;There is now one mongos on &lt;b&gt;every&lt;/b&gt; shard server (all nodes in each shard).  This allows the driver to connect to the shards that are &quot;nearest&quot; to it in a multi-region sharded cluster.  Drivers will balance operations across all mongos which are within it&apos;s &quot;latency window&quot; as measured by ping time.&lt;/p&gt;</comment>
                            <comment id="1867697" author="ravind.kumar" created="Wed, 18 Apr 2018 15:23:45 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pasette&quot; class=&quot;user-hover&quot; rel=&quot;pasette&quot;&gt;pasette&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cory.mintz&quot; class=&quot;user-hover&quot; rel=&quot;cory.mintz&quot;&gt;cory.mintz&lt;/a&gt; is this to say that the number of `mongos` instances is now equal to the number of shards in your sharded cluster?&lt;/p&gt;</comment>
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            <issuekey id="556425">DOCS-11788</issuekey>
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