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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-68263] Do not remove blockers for aborted shard split when deleting the state document</title>
                <link>https://jira.mongodb.org/browse/SERVER-68263</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The tenant access blockers are removed at three locations for shard split :&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/serverless/shard_split_donor_op_observer.cpp#L298&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;When expireAt is set for an aborted migration&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/serverless/shard_split_donor_op_observer.cpp#L426&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;When a document is deleted&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/serverless/shard_split_donor_op_observer.cpp#L170&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;When the collection is dropped&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This opens up a race condition as split tries to remove a blocker for a tenant twice for aborted migration (when setting expireAt and when deleting the document). Therefore we can have the following scenario :&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Starting split for tenantA with id 1&lt;/li&gt;
	&lt;li&gt;Blockers are installed for tenantA for split 1&lt;/li&gt;
	&lt;li&gt;Split 1 aborts due to an error&lt;/li&gt;
	&lt;li&gt;forgetShardSplit is called for split 1. It sets expireAt and remove blocker for tenantA&lt;/li&gt;
	&lt;li&gt;A new split is started with id 2&lt;/li&gt;
	&lt;li&gt;Blockers are installed for tenantA for split 2&lt;/li&gt;
	&lt;li&gt;The state document is removed for split 1. The blocker for tenantA is removed in onDelete (this blocker is owned by split 2)&lt;/li&gt;
	&lt;li&gt;Split 2 &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/serverless/shard_split_donor_op_observer.cpp#L213&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;triggers an invariant&lt;/a&gt; as it expects to have a blocker for tenantA&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2098453">SERVER-68263</key>
            <summary>Do not remove blockers for aborted shard split when deleting the state document</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="didier.nadeau@mongodb.com">Didier Nadeau</assignee>
                                    <reporter username="didier.nadeau@mongodb.com">Didier Nadeau</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jul 2022 16:40:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:23 +0000</updated>
                            <resolved>Thu, 28 Jul 2022 13:32:52 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4710264" author="xgen-internal-githook" created="Wed, 27 Jul 2022 21:43:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Didier Nadeau&apos;, &apos;email&apos;: &apos;didier.nadeau@mongodb.com&apos;, &apos;username&apos;: &apos;nadeaudi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68263&quot; title=&quot;Do not remove blockers for aborted shard split when deleting the state document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68263&quot;&gt;&lt;del&gt;SERVER-68263&lt;/del&gt;&lt;/a&gt; Do not remove blockers when deleting an aborted shard split state document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0760d88c733011a7835b765368283e8dc2d5c144&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0760d88c733011a7835b765368283e8dc2d5c144&lt;/a&gt;&lt;/p&gt;</comment>
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