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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21650] Duplicate _id when reading from secondaries on a sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-21650</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We find there the same _id exist on different sharding, but we set different mode in client to query this _id data ,there will be different results, such as when we use the primary mode query returns only one data &lt;/p&gt;
{ 
    &quot;_id&quot; : ObjectId(&quot;561fce30fd902e1234426ba7&quot;), 
    &quot;adGroupId&quot; : 6025696187079
}
&lt;p&gt;when we use secendaryPreferred or primaryPreferred mode query returns two data&lt;/p&gt;

{ 
    &quot;_id&quot; : ObjectId(&quot;561fce30fd902e1234426ba7&quot;), 
    &quot;adGroupId&quot; : 6025696187079
}
{ 
    &quot;_id&quot; : ObjectId(&quot;561fce30fd902e1234426ba7&quot;), 
    &quot;adGroupId&quot; : 6025696187079
}</description>
                <environment></environment>
        <key id="240887">SERVER-21650</key>
            <summary>Duplicate _id when reading from secondaries on a sharded cluster</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="giser">giser</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Nov 2015 11:05:10 +0000</created>
                <updated>Tue, 24 Nov 2015 13:46:08 +0000</updated>
                            <resolved>Tue, 24 Nov 2015 13:46:08 +0000</resolved>
                                    <version>3.0.7</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1096984" author="ramon.fernandez" created="Tue, 24 Nov 2015 13:46:00 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=giser&quot; class=&quot;user-hover&quot; rel=&quot;giser&quot;&gt;giser&lt;/a&gt;. Secondary reads on sharded clusters may return orphaned documents, please see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5931&quot; title=&quot;Secondary reads in sharded clusters need stronger consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5931&quot;&gt;&lt;del&gt;SERVER-5931&lt;/del&gt;&lt;/a&gt; for further details.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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