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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-12322] Do we have documentation warning users against using load balancers with sharded clusters?</title>
                <link>https://jira.mongodb.org/browse/DOCS-12322</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;Hi Docs,&lt;/p&gt;

&lt;p&gt;We recently had ticket &lt;a href=&quot;https://jira.mongodb.org/browse/NODE-1530&quot; title=&quot;Cursor not found&quot; class=&quot;issue-link&quot; data-issue-key=&quot;NODE-1530&quot;&gt;&lt;del&gt;NODE-1530&lt;/del&gt;&lt;/a&gt;, where a user ran into cursor issues b/c they were using a load balancer in front of a sharded cluster. The solution was to remove the load balancer and switch to using SRV records.&lt;/p&gt;

&lt;p&gt;Another user commented that they would like there to be documentation for this issue to warn users who experience similar errors. Do we currently have any documentation on this subject?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dan&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="665903">DOCS-12322</key>
            <summary>Do we have documentation warning users against using load balancers with sharded clusters?</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="daniel.aprahamian@mongodb.com">Daniel Aprahamian</reporter>
                        <labels>
                            <label>docs-sharding</label>
                    </labels>
                <created>Fri, 4 Jan 2019 22:42:49 +0000</created>
                <updated>Mon, 30 Oct 2023 20:48:56 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4940516" author="edu.bot" created="Mon, 31 Oct 2022 16:06:29 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="2108017" author="daniel.aprahamian" created="Mon, 7 Jan 2019 22:27:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; you can see the error in &lt;a href=&quot;https://jira.mongodb.org/browse/NODE-1530&quot; title=&quot;Cursor not found&quot; class=&quot;issue-link&quot; data-issue-key=&quot;NODE-1530&quot;&gt;&lt;del&gt;NODE-1530&lt;/del&gt;&lt;/a&gt;:&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;&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;MongoError: Cursor not found (namespace: &apos;liveearth.hallMonitorCollectors&apos;, id: 5109468296066159828).&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; at /usr/src/app/node_modules/mongodb-core/lib/connection/pool.js:593:63&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; at authenticateStragglers (/usr/src/app/node_modules/mongodb-core/lib/connection/pool.js:516:16)&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; at Connection.messageHandler (/usr/src/app/node_modules/mongodb-core/lib/connection/pool.js:552:5)&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; at emitMessageHandler (/usr/src/app/node_modules/mongodb-core/lib/connection/connection.js:309:10)&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; at Socket.&amp;lt;anonymous&amp;gt; (/usr/src/app/node_modules/mongodb-core/lib/connection/connection.js:452:17)&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; at Socket.emit (events.js:182:13)&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; at addChunk (_stream_readable.js:283:12)&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; at readableAddChunk (_stream_readable.js:264:11)&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; at Socket.Readable.push (_stream_readable.js:219:10)&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; at TCP.onread (net.js:635:20)&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;Googling &lt;tt&gt;MongoError: Cursor not found&lt;/tt&gt; turns up&#160;&lt;a href=&quot;https://stackoverflow.com/questions/46423442/mongodb-cursor-not-found&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://stackoverflow.com/questions/46423442/mongodb-cursor-not-found&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2107719" author="jeff.yemin" created="Mon, 7 Jan 2019 20:12:43 +0000"  >&lt;p&gt;The most common error will be related to a cursor not being found, since the scenario is typically:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Establish cursor on mongos 1 (via LB) via find/aggregate&lt;/li&gt;
	&lt;li&gt;Execute a getMore operation that hits a different mongos (via LB).&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="2107662" author="alyson.cabral" created="Mon, 7 Jan 2019 19:53:09 +0000"  >&lt;p&gt;I think this is worth calling out. Not sure where would be best though. Daniel, what types of errors were people getting? My first instinct would be to pop that error message into google. This may be better served by making sure we are answering questions on SO or whatever comes up on google when you type the error messages in.&lt;/p&gt;</comment>
                            <comment id="2106251" author="ravind.kumar" created="Fri, 4 Jan 2019 22:55:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-checklist-operations/#load-balancing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/administration/production-checklist-operations/#load-balancing&lt;/a&gt; I think is the only section we have that covers anything related to load balancing. It does talk about &apos;sticky sessions&apos;, though it&apos;s not obvious this is in relation to connections between a client &amp;lt;-&amp;gt; mongos. that seems like a prudent fixup, possibly with one or more cross references in the sharding&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; would we happen to have any more specific guidance on load balancers and sharded clusters? We might also benefit from input from the TSE/CE team here as well.&lt;/p&gt;</comment>
                            <comment id="2106246" author="behackett" created="Fri, 4 Jan 2019 22:54:39 +0000"  >&lt;p&gt;It&apos;s mentioned here, but with no real detail:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-checklist-operations/#load-balancing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/administration/production-checklist-operations/#load-balancing&lt;/a&gt;&lt;/p&gt;</comment>
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