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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-54300] Tenant migration donor instance state documents should be protected by a mutex</title>
                <link>https://jira.mongodb.org/browse/SERVER-54300</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Each instance of the TenantMigrationDonorService maintains an in-memory copy of its underlying state document. This is written to by the main logic that drives a migration and may be concurrently read from other threads, e.g. for currentOp reporting. To avoid data races, the state document should be protected by a mutex.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1612622">SERVER-54300</key>
            <summary>Tenant migration donor instance state documents should be protected by a mutex</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="jason.zhang@mongodb.com">Jason Zhang</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>bkp</label>
                            <label>pm-1791_other_required</label>
                    </labels>
                <created>Thu, 4 Feb 2021 18:08:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:57 +0000</updated>
                            <resolved>Mon, 15 Mar 2021 16:30:39 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3662696" author="xgen-internal-githook" created="Fri, 12 Mar 2021 16:17:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Zhang&apos;, &apos;email&apos;: &apos;jason.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;jz1242&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54300&quot; title=&quot;Tenant migration donor instance state documents should be protected by a mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54300&quot;&gt;&lt;del&gt;SERVER-54300&lt;/del&gt;&lt;/a&gt; Tenant migration donor instance state documents should be protected by a mutex&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c9e91f213a7f28bf466ca7103fe9552f4b993e79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c9e91f213a7f28bf466ca7103fe9552f4b993e79&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3599770" author="xuerui.fa" created="Thu, 4 Feb 2021 18:11:05 +0000"  >&lt;p&gt;Because of the bug described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53996&quot; title=&quot;Recipient should not do reads/writes while holding the instance mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53996&quot;&gt;&lt;del&gt;SERVER-53996&lt;/del&gt;&lt;/a&gt;, we should make sure we release the instance mutex when doing any storage transactions like writing the state document to disk, otherwise we may run into a deadlock situation with concurrent stepDowns.&lt;/p&gt;</comment>
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