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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>[DOCS-16512] Chained Replication caveats are unclear</title>
                <link>https://jira.mongodb.org/browse/DOCS-16512</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Good day,&lt;/p&gt;

&lt;p&gt;I have a case with a customer that involved Chained Replication.&#160; As I looked through the various documentation articles, I found a paragraph that seemed to conflict with itself:&lt;/p&gt;
&lt;blockquote&gt;
&lt;h2&gt;&lt;a name=&quot;NOTE&quot;&gt;&lt;/a&gt;NOTE&lt;/h2&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;If chained replication is disabled, you still can use&#160;&lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/command/replSetSyncFrom/#mongodb-dbcommand-dbcmd.replSetSyncFrom&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;replSetSyncFrom&lt;/tt&gt;&lt;/a&gt;&#160;to specify that a secondary replicates from another secondary. But that configuration will last only until the secondary recalculates which member to sync from.&lt;/p&gt;

&lt;p&gt;It seems that disabled chained replication would prevent moving to another secondary node since the Primary is its target.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;There&apos;s also no indication of what node a given secondary will use when Chained Replication is disabled.&lt;/p&gt;

&lt;p&gt;I confirmed with the expert team that disabling chained replication results in all nodes replicating from the Primary node, and that you can still move it via replSetSyncFrom though if THAT node becomes unavailable, the secondary in question will move to the primary for synch sourcing:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;Veera &#160;&lt;/p&gt;

&lt;p&gt;Hi&#160;&lt;a href=&quot;https://mongodb.slack.com/team/U05Q65P14VC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;@michael.struening&lt;/a&gt;&#160;..If you&#160; disable the chaining,&#160; the primary will become the sync source. If the primary is unavailable or unreachable, log an error and periodically check for primary availability.&#160;(edited)&#160;&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://ca.slack-edge.com/E01C4Q4H3CL-UFQDYE4CB-59ab141de793-48&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;Veera&#160;&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;If sync source is changed temporarily overrides the default sync target for the current member . If the chaining is disabled already the source ID becomes unavailable, and then it would move to the primary&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Can we update the linked documentation pages (and anything connected that I may have missed) to indicate: # Disabling Chained Replication will result in nodes synching from the Primary (and the resulting load on that Primary)&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;You CAN override this sync source via replSetSyncFrom&lt;/li&gt;
	&lt;li&gt;However, if chained replication is disabled and that modified source node is unavailable, then that secondary will move its source ID to the Primary&lt;br/&gt;
If you have any questions or need any clarification, please let me know!&lt;br/&gt;
Thanks!!&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2509384">DOCS-16512</key>
            <summary>Chained Replication caveats are unclear</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="michael.struening@mongodb.com">Michael Struening</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Nov 2023 13:50:25 +0000</created>
                <updated>Mon, 8 Jan 2024 17:04:31 +0000</updated>
                            <resolved>Tue, 28 Nov 2023 01:14:32 +0000</resolved>
                                                    <fixVersion>Server_Docs_[20240108]</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
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                            <comment id="5907839" author="JIRAUSER1253436" created="Tue, 28 Nov 2023 01:14:32 +0000"  >&lt;p&gt;Closing due to site rank being 3428.&#160;&lt;/p&gt;</comment>
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