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    <title>MongoDB Jira</title>
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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>[JAVA-3628] Question: is connectionPoolSetting for single mongos or whole cluster?</title>
                <link>https://jira.mongodb.org/browse/JAVA-3628</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;I am a server-side developer, working on a project which uses a mongo cluster as persistent database.&lt;br/&gt;
I have a question for&#160;&lt;a href=&quot;https://mongodb.github.io/mongo-java-driver/3.8/javadoc/com/mongodb/connection/ConnectionPoolSettings.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodb.github.io/mongo-java-driver/3.8/javadoc/com/mongodb/connection/ConnectionPoolSettings.html&lt;/a&gt;&lt;br/&gt;
It said `to a MongoDB server`&lt;br/&gt;
But what if I have a connectionString like following one&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;A mongodb sharded cluster which has 6 mongos instance.&lt;/p&gt;

&lt;p&gt;Question: &lt;br/&gt;
Is the connectionPoolSetting related to one mongos server? or related to all mongos servers?&lt;br/&gt;
E.g. if we have maxSize = 10 in this setting, does it mean single client has max connection pool = 10 for single mongos server (max pool = 60 for my 6 mongos cluster)? Or max connection pool = 10 for the whole cluster no matter how many mongos server we have?&lt;/p&gt;



&lt;p&gt;&#160;&lt;br/&gt;
&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1155435">JAVA-3628</key>
            <summary>Question: is connectionPoolSetting for single mongos or whole cluster?</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="john.stewart@mongodb.com">John Stewart</assignee>
                                    <reporter username="tangxiao.dalian@gmail.com">Xiao Tang</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Feb 2020 08:21:15 +0000</created>
                <updated>Mon, 23 Mar 2020 14:03:57 +0000</updated>
                            <resolved>Mon, 23 Mar 2020 14:03:57 +0000</resolved>
                                                                    <component>Connection Management</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2953108" author="john.stewart" created="Mon, 9 Mar 2020 12:26:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tangxiao.dalian%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;tangxiao.dalian@gmail.com&quot;&gt;tangxiao.dalian@gmail.com&lt;/a&gt; Yes, that is correct.&lt;/p&gt;</comment>
                            <comment id="2951280" author="tangxiao.dalian@gmail.com" created="Sun, 8 Mar 2020 05:11:16 +0000"  >&lt;p&gt;@John Stewart&lt;br/&gt;
Thanks for your reply~!&lt;br/&gt;
I am so sorry that I just noticed your answer now...&lt;br/&gt;
 So for the case that there are 6 mongos instances, application server will have maxSize=10 for each mongos servers~&lt;/p&gt;</comment>
                            <comment id="2905322" author="john.stewart" created="Mon, 24 Feb 2020 17:44:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tangxiao.dalian%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;tangxiao.dalian@gmail.com&quot;&gt;tangxiao.dalian@gmail.com&lt;/a&gt; Thanks for your questions. Connection pooling is for a single server. So if you set maxSize = 10, this means the connection pool will have up to 10 connections available for a single mongos server.&#160;&lt;/p&gt;</comment>
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