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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-76836] setAllowMigrations is executing remote calls with a session checked out</title>
                <link>https://jira.mongodb.org/browse/SERVER-76836</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73539&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-73539&lt;/a&gt; added replay protection to the &lt;tt&gt;setAllowMigrations&lt;/tt&gt; command, however, this implies having a &lt;a href=&quot;https://github.com/10gen/mongo/blob/761e633ecc7382b9115cddf830dd625956e3a713/src/mongo/db/s/sharding_ddl_util.cpp#L282-L283&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;session checked out&lt;/a&gt;, while a &lt;a href=&quot;https://github.com/10gen/mongo/blob/761e633ecc7382b9115cddf830dd625956e3a713/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L2285-L2286&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refresh on all shards&lt;/a&gt; is happening. In the config shard setup, the following deadlock can occur:&lt;/p&gt;

&lt;p&gt;shardA (also config server)&lt;br/&gt;
shardB&lt;/p&gt;

&lt;p&gt;1. moveChunk from shardB to shardA.&lt;br/&gt;
2. shardA: Some ddl op calls sharding_ddl_util::stopMigrations. For example, in renameCollection, a session X is attached with the _configsvrSetAllowMigrations it sends out to the config server.&lt;br/&gt;
3. shardA (also config server): session X is checked out while running _configsvrSetAllowMigrations.&lt;br/&gt;
4. shardA: during session migration the destination encounters a session with id X, and tries to check it out, but is blocked because of _configsvrSetAllowMigrations.&lt;br/&gt;
5. shardA: _configsvrSetAllowMigrations calls _flushRoutingTableCacheUpdatesWithWriteConcern to all shards.&lt;br/&gt;
6. shardB: _flushRoutingTableCacheUpdatesWithWriteConcern waits for migration source to finish (via recoverRefresh -&amp;gt; wait for migration abort future)&lt;br/&gt;
7. shardB: as part of abort, it waits for _recvChunkReleaseCritSec to succeed. Since session migration is still ongoing on the destination, it will always return an error. But shardA is stuck because session migration is blocked waiting for _configsvrSetAllowMigrations to release the session.&lt;/p&gt;

&lt;p&gt;We should do something similar to the &lt;a href=&quot;https://github.com/10gen/mongo/blob/761e633ecc7382b9115cddf830dd625956e3a713/src/mongo/db/transaction/transaction_participant_resource_yielder.cpp#L43-L75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transaction yielder&lt;/a&gt;, that is, yield the session while doing remote (or possible blocking) work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2331878">SERVER-76836</key>
            <summary>setAllowMigrations is executing remote calls with a session checked out</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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 May 2023 12:56:48 +0000</created>
                <updated>Sun, 29 Oct 2023 21:21:59 +0000</updated>
                            <resolved>Thu, 11 May 2023 10:01:28 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5415516" author="xgen-internal-githook" created="Wed, 10 May 2023 18:10:41 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76836&quot; title=&quot;setAllowMigrations is executing remote calls with a session checked out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76836&quot;&gt;&lt;del&gt;SERVER-76836&lt;/del&gt;&lt;/a&gt; Yield session checked out in setAllowMigrations command before doing network request&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d19cbb4e585885e0581e89d68df1e52040a80f8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d19cbb4e585885e0581e89d68df1e52040a80f8&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2332332">SERVER-76854</issuekey>
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            <issuekey id="2250580">SERVER-73539</issuekey>
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