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    <title>MongoDB Jira</title>
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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-52743] Allow donors to potentially skip the mirroring state, and go directly into dropping or done</title>
                <link>https://jira.mongodb.org/browse/SERVER-52743</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There exists an edge case where a donor could be told to go into dropping after &lt;tt&gt;kPreparingToMirror&lt;/tt&gt;. This is possible in this scenario:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;A donor tells recipients via the oplog that writes are now distributed transactions.&lt;/li&gt;
	&lt;li&gt;The donor steps down or crashes.&lt;/li&gt;
	&lt;li&gt;The resharding operation has moved on to a state past mirroring while the donor was offline.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;This ticket is to ensure that it won&apos;t break code for a donor to transition directly from &lt;tt&gt;kPreparingToMirror&lt;/tt&gt; to &lt;tt&gt;kDropping&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1538427">SERVER-52743</key>
            <summary>Allow donors to potentially skip the mirroring state, and go directly into dropping or done</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Nov 2020 20:25:36 +0000</created>
                <updated>Tue, 6 Dec 2022 01:45:25 +0000</updated>
                            <resolved>Fri, 5 Mar 2021 13:13:26 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3595636" author="max.hirschhorn@10gen.com" created="Tue, 2 Feb 2021 20:24:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt;, if we require that DonorStateMachine must always transition from DonorState::kPreparingToMirror to DonorState::kMirroring, then does anything go wrong? My understanding is that the donor shard would (1) write out new reshardFinalOp no-op oplog entries which would be ignored by the recipient shards (since they have already received such a no-op oplog entry from this donor shard before), (2) transition to DonorState::kMirroring, and (3) immediately transition again to DonorStateEnum::kDropping because the &lt;tt&gt;_coordinatorHasDecisionPersisted&lt;/tt&gt; future has become ready in the meantime.&lt;/p&gt;</comment>
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