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    <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>[SERVER-63045] Drop pooled connections to nodes no longer in sharded cluster after a topology change</title>
                <link>https://jira.mongodb.org/browse/SERVER-63045</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After a repl set reconfig, drop pooled connections to the removed node.&lt;/p&gt;

&lt;p&gt;When a server leaves a sharded cluster, drop pooled connections to and from the removed server.&#160;&lt;/p&gt;

&lt;p&gt;Right now, if a server is removed, hostname resolution is changed, and the server is added back with a new IP, pooled connections to the server that performed hostname resolution before the removal will be broken. The cluster will encounter errors when attempting to use those connections.&lt;/p&gt;

&lt;p&gt;Worse, if there is now a different MongoDB server at the original IP, then connections that were pooled before the removal will&#160;&lt;em&gt;think&lt;/em&gt;&#160;they point at one MongoDB server when they really point to a different one (e.g. consider serverA with hostNameA. Originally, hostnameA resolves to IP_A. Then serverA is removed, and hostname resolution is changed so that hostnameA points to IP_B. Then serverA is re-added to the cluster, and serverB is started at IP_A. Connections that were pooled to serverA before it was removed will have already resolved hostNameA to IP_A, which is incorrect after it is removed. They will actually be talking to serverB).&#160;&lt;/p&gt;

&lt;p&gt;Currently, we need to either wait for connection pools to age out or manually issue a dropConnections command on all cluster members to avoid this issue. If a user doesn&apos;t do this, they will encounter the above issues. We should automatically drop connections to and from removed nodes when we notice a topology change.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Note that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36417&quot; title=&quot;Drop pooled connections to nodes no longer in the replica set after a reconfig&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36417&quot;&gt;SERVER-36417&lt;/a&gt; completed this work for replica sets; i.e. nodes in a replica set that are removed from the config will have connections dropped as part of the reconfig process. This ticket tracks completing the work for sharded clusters/connections outside replica sets (i.e.shard to shard and shard to mongos)&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1972416">SERVER-63045</key>
            <summary>Drop pooled connections to nodes no longer in sharded cluster after a topology change</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-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                    </labels>
                <created>Thu, 27 Jan 2022 16:39:48 +0000</created>
                <updated>Tue, 12 Dec 2023 16:02:24 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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                            <comment id="4321288" author="ratika.gandhi" created="Fri, 28 Jan 2022 16:14:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=garaudy.etienne&quot; class=&quot;user-hover&quot; rel=&quot;garaudy.etienne&quot;&gt;garaudy.etienne&lt;/a&gt;&#160;would like to know the level of effort for this ticket &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lamont.nelson&quot; class=&quot;user-hover&quot; rel=&quot;lamont.nelson&quot;&gt;lamont.nelson&lt;/a&gt;.&lt;/p&gt;</comment>
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