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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>
    </build-info>


<item>
            <title>[DRIVERS-2740] Add support for polling SRV records for mongod discovery</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-2740</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #fafbfc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #fafbfc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;&lt;b&gt;Summary&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;As mentioned in &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-561&quot; title=&quot;Support polling SRV records for mongos discovery&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-561&quot;&gt;&lt;del&gt;DRIVERS-561&lt;/del&gt;&lt;/a&gt;, the SRV polling specification currently &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/polling-srv-records-for-mongos-discovery/polling-srv-records-for-mongos-discovery.rst#implementation&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;disallows non-sharded clusters&lt;/a&gt; from participating in dynamic reconfiguration of the client&apos;s topology on SRV record canges:&lt;/p&gt;

&lt;blockquote&gt;

&lt;p&gt;This feature is only available when the Server Discovery has determined that the TopologyType is Sharded, or Unknown. Drivers &lt;b&gt;MUST NOT&lt;/b&gt; rescan SRV DNS records when the Topology is not Sharded (i.e. Single, ReplicaSetNoPrimary, or ReplicaSetWithPrimary).&lt;/p&gt;
&lt;/blockquote&gt;

&lt;p&gt;In practice, we&apos;ve hit a few issues wherein we are using MongoDB Atlas with a non-sharded cluster, behind PrivateLink endpoints. On occasion, the private endpoints need to be updated or changed. When this happens, many of our NodeJS applications start failing and never recover due to the aforementioned limitations.&#160; The only solution is to restart the application, which reduces availability and introduces operational overhead to resolve.&#160;&lt;/p&gt;

&lt;p&gt;Ideally, non-sharded clusters could benefit from the current dynamic updates from polling the SRV records for changes.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;&#160;&lt;/p&gt;
&lt;div class=&quot;panel&quot; style=&quot;background-color: #fafbfc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #fafbfc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/h3&gt;
&lt;h4&gt;&lt;a name=&quot;Whoistheaffectedenduser%3F&quot;&gt;&lt;/a&gt;Who is the affected end user?&lt;/h4&gt;

&lt;p&gt;Users who use non-sharded clusters and who make changes to SRV while applications are running.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howdoesthisaffecttheenduser%3F&quot;&gt;&lt;/a&gt;How does this affect the end user?&lt;/h4&gt;

&lt;p&gt;&lt;em&gt;Are they blocked? Are they annoyed? Are they confused?&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;Loss of application availability and increased operational effort to resolve.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howlikelyisitthatthisproblemorusecasewilloccur%3F&quot;&gt;&lt;/a&gt;How likely is it that this problem or use case will occur?&lt;/h4&gt;

&lt;p&gt;The likelihood is reasonably high for users that have many environments which change their infrastructure or perform migrations frequently.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Iftheproblemdoesoccur%2Cwhataretheconsequencesandhowseverearethey%3F&quot;&gt;&lt;/a&gt;If the problem does occur, what are the consequences and how severe are they?&lt;/h4&gt;

&lt;p&gt;It is very difficult to debug as its not clear in the logs. This required consultation with MongoDB Atlas experts in order to troubleshoot.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisissueurgent%3F&quot;&gt;&lt;/a&gt;Is this issue urgent?&lt;/h4&gt;

&lt;p&gt;Not urgent, but highly desired.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketrequiredbyadownstreamteam%3F&quot;&gt;&lt;/a&gt;Is this ticket required by a downstream team?&lt;/h4&gt;

&lt;p&gt;No&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketonlyfortests%3F&quot;&gt;&lt;/a&gt;Is this ticket only for tests?&lt;/h4&gt;

&lt;p&gt;No&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;AcceptanceCriteria&quot;&gt;&lt;/a&gt;&lt;b&gt;Acceptance Criteria&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;SVR polling and resolution semantics is available for non-sharded clusters.&lt;/p&gt;

&lt;p&gt;The following is an (untested) example of how this might be able to be achieved today using the NodeJS native driver:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Create client with SRV+seedlist connection string&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const uri = &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;mongodb+srv://&amp;lt;prefix&amp;gt;.mongodb.net/auth0?retryWrites=false&amp;amp;appName=server&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const client = &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; MongoClient(uri);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Connect to the MongoDB cluster&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;await client.connect();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// As a workaround for https://github.com/mongodb/specifications/blob/master/source/polling-srv-records-for-mongos-discovery/polling-srv-records-for-mongos-discovery.rst#implementation&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// See https://jira.mongodb.org/browse/DRIVERS-561&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const srvPoller = client.s.srvPoller;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Could be undefined non-SRV-based config so we shouldn&apos;t assume generally&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; (srvPoller) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Reproduce what happens for sharded clusters in Topology#detectShardedTopology&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; srvPoller.on(SrvPoller.SRV_RECORD_DISCOVERY, client.s.detectSrvRecords);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; srvPoller.start();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;However, as noted this uses internal implementation details that may&#160; change on subsequent releases. Thus, first class support is preferred.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="2457487">DRIVERS-2740</key>
            <summary>Add support for polling SRV records for mongod discovery</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</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="-1">Unassigned</assignee>
                                    <reporter username="rtiernay@gmail.com">Bob Tiernay</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 Oct 2023 15:50:44 +0000</created>
                <updated>Wed, 4 Oct 2023 19:41:07 +0000</updated>
                                                                <component>SRV Polling</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5753336" author="alex.bevilacqua" created="Wed, 4 Oct 2023 19:41:07 +0000"  >&lt;blockquote&gt;&lt;p&gt;Got it. What if anything is the downside to performing this in addition to the natural SDAM behavior for replica sets?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;For multithreaded drivers there would be a monitoring thread for the SRV record and a separate monitoring thread for SDAM, which could conceivably result in a race condition between monitors. &lt;/p&gt;</comment>
                            <comment id="5753129" author="JIRAUSER1275298" created="Wed, 4 Oct 2023 18:37:13 +0000"  >&lt;p&gt;Got it. What if anything is the downside to performing this in addition to the natural SDAM behavior for replica sets? &lt;/p&gt;</comment>
                            <comment id="5752890" author="alex.bevilacqua" created="Wed, 4 Oct 2023 17:38:36 +0000"  >&lt;blockquote&gt;&lt;p&gt;Correct, but SRV resolution only happens on initial discovery. After that it never happens again. How is the lack of need for this capability different that from Mongos rediscovery?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;SRV resolution for replica sets provides the initial seed list, however server discovery will be performed as part of steady-state monitoring. For example if a 3 member replica set were to add 2 members, a subsequent monitoring event (heartbeat) would include that information automatically, and the drivers can update their representation of the cluster topology based on that information.&lt;/p&gt;

&lt;p&gt;There is no mechanism for drivers to discover changes to the available mongos&apos;, which is why polling SRV was scoped to sharded clusters only.&lt;/p&gt;</comment>
                            <comment id="5752834" author="JIRAUSER1275298" created="Wed, 4 Oct 2023 17:22:54 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Polling SRV for mongos discovery was scoped exclusively to sharded clusters as replica sets already had a discovery mechanism within the drivers in the form of server discovery and monitoring.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Correct, but &lt;tt&gt;SRV&lt;/tt&gt; resolution only happens on &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/initial-dns-seedlist-discovery/initial-dns-seedlist-discovery.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;initial discovery&lt;/a&gt;. After that it never happens again. How is the lack of need for this capability different that from Mongos rediscovery?&lt;/p&gt;</comment>
                            <comment id="5751970" author="alex.bevilacqua" created="Wed, 4 Oct 2023 13:53:29 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rtiernay%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;rtiernay@gmail.com&quot;&gt;rtiernay@gmail.com&lt;/a&gt;, and thanks for opening this ticket.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;One thing I failed to ask in the ticket description is why this limitation exists in the first place. I assume there was some rationale, but that is not reflected in any specification or Jira that I can find. At a minimum, updating these documents to reflect that rationale would be greatly appreciated for those who are in a similar situation.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Polling SRV for mongos discovery was scoped exclusively to sharded clusters as replica sets already had a discovery mechanism within the drivers in the form of &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-discovery-and-monitoring.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;server discovery and monitoring&lt;/a&gt;.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;On occasion, the private endpoints need to be updated or changed. When this happens, many of our NodeJS applications start failing and never recover due to the aforementioned limitations.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The issue you&apos;ve described is an edge case that occurs as a result of how private endpoints are being managed, how replica set reconfiguration works and how server discovery/monitoring works, however I&apos;m looking into this in greater detail for the time being to determine how best to proceed.&lt;/p&gt;</comment>
                            <comment id="5749055" author="JIRAUSER1275298" created="Tue, 3 Oct 2023 16:00:35 +0000"  >&lt;p&gt;One thing I failed to ask in the ticket description is why this limitation exists in the first place. I assume there was some rationale, but that is not reflected in any specification or Jira that I can find. At a minimum, updating these documents to reflect that rationale would be greatly appreciated for those who are in a similar situation.&lt;/p&gt;</comment>
                            <comment id="5749023" author="JIRAUSER1275298" created="Tue, 3 Oct 2023 15:54:21 +0000"  >&lt;p&gt;Please note that this Jira may assist with &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-910&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/DRIVERS-910&lt;/a&gt; for clusters in transition to Mongo 8 which only supports sharded clusters.&lt;/p&gt;</comment>
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