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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-53653] [Resharding] Take the critical section when renaming on recipient shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-53653</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Background&quot;&gt;&lt;/a&gt;Background&lt;/h3&gt;

&lt;p&gt;After a coordinator transitions to &lt;tt&gt;kRenaming&lt;/tt&gt;, there exists a potential gap in-between these two events:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The recipient shard updates its routing info, and&lt;/li&gt;
	&lt;li&gt;The recipient shard renames the collection locally.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In this gap, it&apos;s possible that a router can attempt to read from this collection when the collection doesn&apos;t actually exist at the storage level. This might culminate in a &lt;tt&gt;NamespaceNotFound&lt;/tt&gt; error, which isn&apos;t considered retryable.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Solution&quot;&gt;&lt;/a&gt;Solution&lt;/h3&gt;

&lt;p&gt;In order to prevent this, on a given recipient shard, we will need to take the CSR&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6221e2ee0ff5527f13d25a28a5de6a245bd0e641/src/mongo/db/s/collection_sharding_runtime.h#L117-L132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;critical section&lt;/a&gt; from before the point in which the refresh completes, up until the rename itself has been completed.&lt;/p&gt;

&lt;p&gt;To do this, create a resharding-specific RAII type that can be fed a new opCtx for entering/exiting the critical section. As part of the destruction of this RAII type, it&apos;s important to leave the critical section, so that if the resharding operation errors out, the shard isn&apos;t permanently stuck in the critical section.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1584315">SERVER-53653</key>
            <summary>[Resharding] Take the critical section when renaming on recipient shards</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-lifecycle</label>
                    </labels>
                <created>Fri, 8 Jan 2021 14:57:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:02 +0000</updated>
                            <resolved>Wed, 5 May 2021 05:03:22 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3755685" author="xgen-internal-githook" created="Wed, 5 May 2021 04:46:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53653&quot; title=&quot;[Resharding] Take the critical section when renaming on recipient shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53653&quot;&gt;&lt;del&gt;SERVER-53653&lt;/del&gt;&lt;/a&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;Resharding&amp;#93;&lt;/span&gt; Take the critical section when renaming on recipient shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/70d2f7fb8f378b667ace89da18c69ebcfcfc4551&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/70d2f7fb8f378b667ace89da18c69ebcfcfc4551&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3714640" author="xgen-internal-githook" created="Tue, 13 Apr 2021 08:34:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53653&quot; title=&quot;[Resharding] Take the critical section when renaming on recipient shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53653&quot;&gt;&lt;del&gt;SERVER-53653&lt;/del&gt;&lt;/a&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;Resharding&amp;#93;&lt;/span&gt; Take the critical section when renaming on recipient shards&lt;/p&gt;

&lt;p&gt;Have donor role perform rename if also a recipient&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/815d4e362bac8a5113d7102d1b717ceeab1f233e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/815d4e362bac8a5113d7102d1b717ceeab1f233e&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1702145">SERVER-56659</issuekey>
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            <issuekey id="1700524">SERVER-56612</issuekey>
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            <issuelink>
            <issuekey id="1708156">SERVER-56785</issuekey>
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