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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-51834] Race in moveChunk tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-51834</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sequential moveChunk commands sent to a host can result in the &quot;Unable to start new migration because this shard is currently donating chunk&quot; &lt;br/&gt;
For example &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d86911e39b4c89a12777b3238fc3c455d6f5ed9f/jstests/sharding/snapshot_cursor_commands_mongos.js#L129&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt;&lt;br/&gt;
and&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/d86911e39b4c89a12777b3238fc3c455d6f5ed9f/jstests/sharding/finer_grained_feature_flag.js#L41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; tests &lt;br/&gt;
have shown this error.&lt;/p&gt;

&lt;p&gt;The issue is raised in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d86911e39b4c89a12777b3238fc3c455d6f5ed9f/src/mongo/db/s/move_chunk_command.cpp#L138&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;moveChunk code&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1524923">SERVER-51834</key>
            <summary>Race in moveChunk tests</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Mon, 26 Oct 2020 05:08:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:01:33 +0000</updated>
                            <resolved>Tue, 17 Nov 2020 15:16:13 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3497942" author="xgen-internal-githook" created="Thu, 19 Nov 2020 16:41:33 +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-51834&quot; title=&quot;Race in moveChunk tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51834&quot;&gt;&lt;del&gt;SERVER-51834&lt;/del&gt;&lt;/a&gt; Race in moveChunk tests&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5bcf61fcaadc7f1385c21d21e37b85e5d4c46eea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5bcf61fcaadc7f1385c21d21e37b85e5d4c46eea&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3493415" author="xgen-internal-githook" created="Tue, 17 Nov 2020 13:09:11 +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-51834&quot; title=&quot;Race in moveChunk tests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51834&quot;&gt;&lt;del&gt;SERVER-51834&lt;/del&gt;&lt;/a&gt; Race in moveChunk tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9b0e366a75a9cc25705969932b3374d21d4d13c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9b0e366a75a9cc25705969932b3374d21d4d13c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3491433" author="JIRAUSER1256927" created="Mon, 16 Nov 2020 12:26:19 +0000"  >&lt;p&gt;The issue is that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/828c8c47f9e9decb63996e52141301040cd9acc3/src/mongo/db/s/move_chunk_command.cpp#L143-L182&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this code&lt;/a&gt; wrongly assumes that when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/828c8c47f9e9decb63996e52141301040cd9acc3/src/mongo/db/s/move_chunk_command.cpp#L182&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the future is ready&lt;/a&gt; the objects captured in the functor were already destroyed.&lt;/p&gt;</comment>
                            <comment id="3491425" author="JIRAUSER1256927" created="Mon, 16 Nov 2020 12:16:26 +0000"  >&lt;p&gt;I managed to deterministically reproduce this issue after adding an sleep of a few seconds inside &lt;a href=&quot;https://github.com/mongodb/mongo/blob/828c8c47f9e9decb63996e52141301040cd9acc3/src/mongo/db/s/active_migrations_registry.cpp#L243-L247&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this if-stmt.&lt;/a&gt;&lt;/p&gt;</comment>
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