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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-34727] Rename collection during initial sync drops extra collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-34727</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If after the end of the clone phase, we have on the syncing node&lt;/p&gt;

&lt;p&gt;collection_a: UUID_1&lt;br/&gt;
collection_b: UUID_2&lt;br/&gt;
collection_c: UUID_3&lt;/p&gt;

&lt;p&gt;and we replay a renameCollection opcode renaming UUID_1 to collection_b with dropTarget: UUID_3, we will correctly rename UUID_2 to a temporary name, but also incorrectly drop UUID_3.  When we then go to create UUID_3 in a later oplog entry, it may be in drop_pending state and refuse to be re-created.&lt;/p&gt;</description>
                <environment></environment>
        <key id="535382">SERVER-34727</key>
            <summary>Rename collection during initial sync drops extra collection</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="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Apr 2018 19:49:59 +0000</created>
                <updated>Fri, 27 Apr 2018 22:37:30 +0000</updated>
                            <resolved>Fri, 27 Apr 2018 20:38:58 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1876783" author="matthew.russotto" created="Fri, 27 Apr 2018 22:37:30 +0000"  >&lt;p&gt;It&apos;s safe to drop it (provided you can save it from drop-pendingland) but it turns out that&apos;s actually not what happened &amp;#8211; in fact, now that I think about it, it can&apos;t happen, because you&apos;ll never get a dropTarget with a UUID that you haven&apos;t created yet.   In this case I think what actually happened is we had a dropTarget of &quot;true&quot; because the related backports weren&apos;t in the 3.6 version yet.&lt;/p&gt;</comment>
                            <comment id="1876617" author="judah.schvimer" created="Fri, 27 Apr 2018 20:05:36 +0000"  >&lt;p&gt;If &lt;tt&gt;dropTarget&lt;/tt&gt; UUID_3 is specified, why is it safe to not drop it? We&apos;ve had the opposite problem in the past. I think the problem here is that when we go to create UUID_3, we should rename the drop-pending collection to the requested name so the post-image is maintained.&lt;/p&gt;</comment>
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