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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-52801] Implement a local drop on resharding donors</title>
                <link>https://jira.mongodb.org/browse/SERVER-52801</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Background&quot;&gt;&lt;/a&gt;Background&lt;/h3&gt;
&lt;p&gt;Since a drop from the DonorStateMachine can happen concurrently with a rename from a RecipientStateMachine on the same node, there&apos;s no inherent guarantee of ordering. Thus, there can be two scenarios that the drop functionality can find itself in:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;If the renameCollection with dropTarget=true happens first, then the drop would see &amp;lt;database&amp;gt;.&amp;lt;collection&amp;gt; has a UUID of reshardingUUID.&lt;/li&gt;
	&lt;li&gt;If the drop happens first, the drop would see &amp;lt;database&amp;gt;.&amp;lt;collection&amp;gt; has a UUID of existingUUID.&lt;/li&gt;
&lt;/ol&gt;


&lt;h3&gt;&lt;a name=&quot;Solution&quot;&gt;&lt;/a&gt;Solution&lt;/h3&gt;
&lt;ol&gt;
	&lt;li&gt;If the rename happens first and the collection has a UUID of reshardingUUID, this means that the rename already took care of the drop (via dropTarget=true) and the DonorStateMachine can successfully transition to kDone without taking any action.&lt;/li&gt;
	&lt;li&gt;If the drop happens first and the collection has a UUID of existingUUID, the DonorStateMachine can drop the local collection. This is fine, because when the rename happens afterwards, the rename&apos;s dropTarget piece will end up being a no-op.&lt;/li&gt;
&lt;/ol&gt;

</description>
                <environment></environment>
        <key id="1539577">SERVER-52801</key>
            <summary>Implement a local drop on resharding donors</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-lifecycle</label>
                    </labels>
                <created>Wed, 11 Nov 2020 23:14:30 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:30 +0000</updated>
                            <resolved>Mon, 7 Dec 2020 15:18:38 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3517352" author="xgen-internal-githook" created="Sat, 5 Dec 2020 01:20:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52801&quot; title=&quot;Implement a local drop on resharding donors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52801&quot;&gt;&lt;del&gt;SERVER-52801&lt;/del&gt;&lt;/a&gt; Implement local drop for the original collection on resharding donors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90150fccbac05d75e96b6874132dae71c3c0b31c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90150fccbac05d75e96b6874132dae71c3c0b31c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3501144" author="blake.oler" created="Sat, 21 Nov 2020 15:48:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; this makes a lot of sense. Changing the ticket.&lt;/p&gt;</comment>
                            <comment id="3500914" author="max.hirschhorn@10gen.com" created="Sat, 21 Nov 2020 00:49:35 +0000"  >&lt;p&gt;If the DonorStateMachine confirms the UUID of the sharded collection it is dropping to be &lt;tt&gt;existingUUID&lt;/tt&gt; rather than &lt;tt&gt;reshardingUUID&lt;/tt&gt;, then does there really need to be explicit synchronization between the two primary-only services? That is,&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;if the renameCollection with dropTarget=true happens first, then the drop would see &amp;lt;database&amp;gt;.&amp;lt;collection&amp;gt; has a UUID of &lt;tt&gt;reshardingUUID&lt;/tt&gt; and doesn&apos;t drop it, and&lt;/li&gt;
	&lt;li&gt;if the renameCollection with dropTarget=true happens second, then the drop would see &amp;lt;database&amp;gt;.&amp;lt;collection&amp;gt; has a UUID of &lt;tt&gt;existingUUID&lt;/tt&gt;, drops it, and the renameCollection&apos;s dropTarget piece ends up being a no-op.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                                                <inwardlinks description="has to be done after">
                                        <issuelink>
            <issuekey id="1539657">SERVER-52802</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1558803">SERVER-53224</issuekey>
        </issuelink>
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