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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-10229] Docs for SERVER-28289: make shards verify that they are present in the config.shards of the cluster their shardIdentity points to</title>
                <link>https://jira.mongodb.org/browse/DOCS-10229</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h1&gt;&lt;a name=&quot;DocumentationRequestSummary%3A&quot;&gt;&lt;/a&gt;Documentation Request Summary: &lt;/h1&gt;

&lt;p&gt;We decided to just improve documentation in order to help customers avoid this issue.&lt;/p&gt;

&lt;p&gt;The recommended improvement is for the &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/restore-sharded-cluster/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Restore a Sharded Cluster&lt;/a&gt; page. There are two restore procedures described on the page, and here are the recommended updates to each:&lt;/p&gt;

&lt;p&gt;For the &quot;Restore a Sharded Cluster with Filesystem Snapshots&quot; procedure (the first procedure on the page), first modify step 6.1 to specify &quot;without the &lt;tt&gt;--shardsvr&lt;/tt&gt; option&quot;, like so:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Restart the replica set members for the shard with the &lt;tt&gt;recoverShardingState&lt;/tt&gt; parameter set to false and without the &lt;tt&gt;--shardsvr&lt;/tt&gt; option.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Then add a step between steps 6.2 and 6.3 that says:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;If the config server&apos;s host:port has changed, update the document on each shard in &lt;tt&gt;admin.system.version&lt;/tt&gt; where &lt;tt&gt;_id&lt;/tt&gt; equals &lt;tt&gt;shardIdentity&lt;/tt&gt; to have the new config server replica set connection string in the &lt;tt&gt;configsvrConnectionString&lt;/tt&gt; field:&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;use admin&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;db.system.version.update(&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;  { _id: &quot;shardIdentity&quot; },&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;  { $set: { configsvrConnectionString: &amp;lt;the new string&amp;gt; } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;/blockquote&gt;

&lt;p&gt;For the &quot;Restore a Sharded Cluster with Database Dumps&quot; procedure (the second procedure on the page), add a step between steps 9 and 10 that says:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;If the config servers&apos; hostnames have changed, update the shardIdentity docs in each shard.&lt;/p&gt;

&lt;p&gt;1. Restart all the shard mongod instances without the &lt;tt&gt;--shardsvr&lt;/tt&gt; option.&lt;/p&gt;

&lt;p&gt;2. Connect a mongo shell to the primary of the replica set and update the document in &lt;tt&gt;admin.system.version&lt;/tt&gt; where &lt;tt&gt;_id&lt;/tt&gt; equals &lt;tt&gt;shardIdentity&lt;/tt&gt; to have the new config server replica set connection string in the &lt;tt&gt;configsvrConnectionString&lt;/tt&gt; field:&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;
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				&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;use admin&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;db.system.version.update(&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;  { _id: &quot;shardIdentity&quot; },&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;  { $set: { configsvrConnectionString: &amp;lt;the new string&amp;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;3. Shut down the shard mongod instances.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h1&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h1&gt;

&lt;p&gt;While debugging a customer issue with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ChrisHarrisHP&quot; class=&quot;user-hover&quot; rel=&quot;ChrisHarrisHP&quot;&gt;ChrisHarrisHP&lt;/a&gt;, we found that it&apos;s fairly easy to attempt to make a backup cluster from a snapshot of a production cluster without deleting the shardIdentity doc from the backup shards.&lt;/p&gt;

&lt;p&gt;The backup cluster&apos;s shards will have the &lt;b&gt;production&lt;/b&gt; cluster&apos;s config server connection string in their shardIdentity docs, so they will connect to the production cluster&apos;s config servers on startup without complaint. (We want them to instead connect to the &lt;b&gt;backup&lt;/b&gt; cluster&apos;s config servers).&lt;/p&gt;

&lt;p&gt;It would help in catching this issue if shards were able to verify they were part of config.shards as part of sharding initialization.&lt;/p&gt;

&lt;p&gt;I can imagine this being tricky, though, because it might involve comparing connection strings, which we try to avoid. We can&apos;t compare shardIds, because the backup shard and production shard will have the same shardId in their shardIdentity. They will only differ in their host/port.&lt;/p&gt;</description>
                <environment></environment>
        <key id="382062">DOCS-10229</key>
            <summary>Docs for SERVER-28289: make shards verify that they are present in the config.shards of the cluster their shardIdentity points to</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="ravind.kumar">Ravind Kumar</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 May 2017 19:58:04 +0000</created>
                <updated>Mon, 30 Oct 2023 21:12:56 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940748" author="edu.bot" created="Mon, 31 Oct 2022 16:10:16 +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>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
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