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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>[SERVER-14644] Retrieving duplicate records with the same _id from secondaries.</title>
                <link>https://jira.mongodb.org/browse/SERVER-14644</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We are getting duplicates of the same records returned from a query.  I suspect this is due to a failed chunk migration.    &lt;/p&gt;

&lt;p&gt;We are running 2.4.8 and there is no chunk cleanup option in this version.&lt;/p&gt;

&lt;p&gt;We are not able to serve all queries with the primaries because we are bound by CPU currently.&lt;/p&gt;

&lt;p&gt;Is there a fix for this issue in 2.4.8 or an option we can use until we are able to upgrade to 2.6?&lt;/p&gt;

&lt;p&gt;I believe this is being addressed in 2.8 as the secondaries are aware of the ranges and will take duplicates out before returning the set?&lt;/p&gt;</description>
                <environment></environment>
        <key id="148250">SERVER-14644</key>
            <summary>Retrieving duplicate records with the same _id from secondaries.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="sflint@sailthru.com">sam flint</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Jul 2014 22:32:57 +0000</created>
                <updated>Wed, 10 Dec 2014 23:05:44 +0000</updated>
                            <resolved>Tue, 22 Jul 2014 16:16:49 +0000</resolved>
                                    <version>2.4.8</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="667679" author="sflint@sailthru.com" created="Tue, 22 Jul 2014 16:37:44 +0000"  >&lt;p&gt;Thank you...I tried to find a ticket that had already been created, didn&apos;t so i put this one in.   Thanks for the clarification. &lt;/p&gt;</comment>
                            <comment id="667659" author="asya" created="Tue, 22 Jul 2014 16:16:30 +0000"  >&lt;p&gt;additional note: this will happen even without failed migrations due to same documents existing on two shards at the same time during migration process.&lt;/p&gt;</comment>
                            <comment id="667657" author="asya" created="Tue, 22 Jul 2014 16:13:41 +0000"  >&lt;p&gt;Sam,&lt;/p&gt;

&lt;p&gt;You filed this as P1 server ticket, however this is tracked and understood behavior described by &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; - if you want to make sure that you only get documents owned by the shard you have to EITHER query by shard key, or query only primaries.&lt;/p&gt;

&lt;p&gt;It sounds like these are secondary queries which don&apos;t involve the shard key, so it&apos;s a duplicate of &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;.&lt;/p&gt;

&lt;p&gt;Asya&lt;/p&gt;</comment>
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