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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-53330] Make ReshardingCoordinator get the list of donors and recipients after setting allowMigrations:false</title>
                <link>https://jira.mongodb.org/browse/SERVER-53330</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ReshardingCoordinator should retrieve the donor shards for the resharding operation only once allowMigrations:false is set and/or there&#160; are some locks acquired to prevent concurrent moveChunks from occurring / succeeding in the meanwhile.&#160;&lt;/p&gt;

&lt;p&gt;In the current code, it is possible that the ReshardingCoordinator could have an incorrect list of donors and recipients.&#160;&lt;/p&gt;

&lt;p&gt;Consider the following scenario:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;suppose we have a failpoint set to be paused in reshardCollectionCmd at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/588084f90b7b5706a4ec60db05826b3f30c1fc8e/src/mongo/db/s/config/configsvr_reshard_collection_cmd.cpp#L192&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line here&lt;/a&gt;, after we get donor/recipients from the chunkManager, but before we even create the ReshardingCoordinatorService instance, let alone set &lt;a href=&quot;https://github.com/mongodb/mongo/blob/588084f90b7b5706a4ec60db05826b3f30c1fc8e/src/mongo/db/s/resharding/resharding_coordinator_service.cpp#L215&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;allowMigrations:false&lt;/a&gt; on the original collection.&lt;/li&gt;
	&lt;li&gt;a moveChunk comes in and succeeds&lt;/li&gt;
	&lt;li&gt;we unpause the failpoint, reshardCollection begins and tries to run with donor shards who no longer actually own the data&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1565658">SERVER-53330</key>
            <summary>Make ReshardingCoordinator get the list of donors and recipients after setting allowMigrations:false</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="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-lifecycle</label>
                    </labels>
                <created>Thu, 10 Dec 2020 20:13:22 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:36 +0000</updated>
                            <resolved>Mon, 25 Jan 2021 16:20:49 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3578960" author="xgen-internal-githook" created="Fri, 22 Jan 2021 22:38:10 +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-53330&quot; title=&quot;Make ReshardingCoordinator get the list of donors and recipients after setting allowMigrations:false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53330&quot;&gt;&lt;del&gt;SERVER-53330&lt;/del&gt;&lt;/a&gt; In a resharding operation, retrieve list of participant shards after emplacing the coordinator document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ea7b9357fc3631000eff64b92634d1b7a6068305&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ea7b9357fc3631000eff64b92634d1b7a6068305&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1599771">SERVER-54023</issuekey>
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