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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-17041] Chaining using syncFrom should warn when circular secondary chain is attempted</title>
                <link>https://jira.mongodb.org/browse/SERVER-17041</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;3 members in a replica set.&lt;br/&gt;
Go to secondary1 , rs.syncFrom(&apos;secondary2&apos;)&lt;br/&gt;
Go to secondary 2, rs.syncFrom(&apos;secondary1&apos;)&lt;br/&gt;
Result: replica set now configured such that secondaries sync from each other, none of them from the primary.&lt;/p&gt;

&lt;p&gt;This situation is detectable in the status, and at least should produce a warning when attempted &quot;sync target specified appears circular&quot;.&lt;/p&gt;

&lt;p&gt;Since RS and elections may break this circularity, it may be allowed, but to an unsuspecting user this may cause confusion since the secondaries will &quot;fail&quot; to update.&lt;/p&gt;</description>
                <environment></environment>
        <key id="180694">SERVER-17041</key>
            <summary>Chaining using syncFrom should warn when circular secondary chain is attempted</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-repl">Backlog - Replication Team</assignee>
                                    <reporter username="nuknuksan">nuk nuk san</reporter>
                        <labels>
                    </labels>
                <created>Sun, 25 Jan 2015 20:15:28 +0000</created>
                <updated>Tue, 6 Dec 2022 04:56:31 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="813411" author="scotthernandez" created="Mon, 26 Jan 2015 19:13:25 +0000"  >&lt;p&gt;Yes, it might be possible to detect this temporary state but it can only come about due to users/admins taking control of replication paths. &lt;/p&gt;

&lt;p&gt;There are many events which will cause the manual sync source to reset and go to a member with fresher data, so in most cases this will self-rectify as writes come in.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="62831" name="syncFromLoop.js" size="2659" author="scotthernandez" created="Mon, 26 Jan 2015 19:13:25 +0000"/>
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