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    <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-55656] Prevent early destruction of sharding DDL coordinators</title>
                <link>https://jira.mongodb.org/browse/SERVER-55656</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently there is no guarantee that the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/sharding_ddl_coordinator.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingDDLCoordinator&lt;/a&gt; will emplace &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1b40b034bcaadcf5e9713e59970e2838af3fa4ca/src/mongo/db/s/sharding_ddl_coordinator.cpp#L67-L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;their completion promises&lt;/a&gt; before their destruction. In fact it is possible that we loose all the references to a coordinator, in fact if a stepdown/shutdown happens between:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/38c0f1e107f1a582624280dcb7d85dcb17efb472/src/mongo/db/s/drop_database_coordinator.cpp#L263&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;By removing its stored document&lt;/a&gt; (the POS &lt;a href=&quot;https://github.com/mongodb/mongo/blob/38c0f1e107f1a582624280dcb7d85dcb17efb472/src/mongo/db/repl/primary_only_service.cpp#L539&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;will remove its reference from the active instance map&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/38c0f1e107f1a582624280dcb7d85dcb17efb472/src/mongo/db/s/shardsvr_drop_collection_command.cpp#L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;By interrupting the command from which the coordinator was originated.&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We will loose all the reference to the coordinator that will be destructed &lt;a href=&quot;https://github.com/mongodb/mongo/blob/38c0f1e107f1a582624280dcb7d85dcb17efb472/src/mongo/db/s/sharding_ddl_coordinator.cpp#L137&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;without having the chance to set its completion promise&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The proposed solution here is to move the removal of the coordinator document to the onCompletion task of the ShardingDDLCoordinator, so that ti will be done in the same future chain task.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1665375">SERVER-55656</key>
            <summary>Prevent early destruction of sharding DDL coordinators</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1965-Milestone-1</label>
                    </labels>
                <created>Tue, 30 Mar 2021 20:52:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:35 +0000</updated>
                            <resolved>Tue, 6 Apr 2021 17:29:56 +0000</resolved>
                                    <version>Backlog</version>
                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3703618" author="xgen-internal-githook" created="Tue, 6 Apr 2021 17:27:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55656&quot; title=&quot;Prevent early destruction of sharding DDL coordinators&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55656&quot;&gt;&lt;del&gt;SERVER-55656&lt;/del&gt;&lt;/a&gt; Prevent early destruction of sharding DDL coordinators&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8222bef16ae26297f7313274e4ca15eb1dd54655&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8222bef16ae26297f7313274e4ca15eb1dd54655&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1629614">SERVER-54696</issuekey>
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