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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-26370] Race condition allows shard to be chunk donor and recipient at the same time</title>
                <link>https://jira.mongodb.org/browse/SERVER-26370</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The check for whether a shard is already participating in a migration as either donor or recipient is racy and may allow both to happen at the same time for the same collection.&lt;/p&gt;

&lt;p&gt;This should never be allowed to happen because it may lead to a state of the cached shard metadata which is consistent as far as the shard version is concerned, but is missing the received chunk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="319445">SERVER-26370</key>
            <summary>Race condition allows shard to be chunk donor and recipient at the same time</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Sep 2016 15:03:34 +0000</created>
                <updated>Sat, 19 Nov 2016 00:02:45 +0000</updated>
                            <resolved>Thu, 29 Sep 2016 18:35:22 +0000</resolved>
                                    <version>3.3.15</version>
                                    <fixVersion>3.4.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1397522" author="xgen-internal-githook" created="Fri, 30 Sep 2016 13:42:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26370&quot; title=&quot;Race condition allows shard to be chunk donor and recipient at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26370&quot;&gt;&lt;del&gt;SERVER-26370&lt;/del&gt;&lt;/a&gt; Improve error messages returned on moveChunk conflict&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d6d5a9081c357df6149c10c296797ffd5339aa3f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d6d5a9081c357df6149c10c296797ffd5339aa3f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1396884" author="xgen-internal-githook" created="Thu, 29 Sep 2016 18:32:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26370&quot; title=&quot;Race condition allows shard to be chunk donor and recipient at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26370&quot;&gt;&lt;del&gt;SERVER-26370&lt;/del&gt;&lt;/a&gt; Register incoming migrations on the ActiveMigrationsRegistry&lt;/p&gt;

&lt;p&gt;In order to avoid race conditions where a shard could serve both as a&lt;br/&gt;
donor and recipient.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ba3dc420fe41f9c6ba718da5eb270161374839f3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ba3dc420fe41f9c6ba718da5eb270161374839f3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1396882" author="xgen-internal-githook" created="Thu, 29 Sep 2016 18:32:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26370&quot; title=&quot;Race condition allows shard to be chunk donor and recipient at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26370&quot;&gt;&lt;del&gt;SERVER-26370&lt;/del&gt;&lt;/a&gt; Cleanup MigrationDestinationManager&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b12af9e243b98b50d5918d9afa9354b9935cebf0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b12af9e243b98b50d5918d9afa9354b9935cebf0&lt;/a&gt;&lt;/p&gt;</comment>
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