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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26471] Race between chunk metadata commit and an immediate move of a chunk from the donor may leave gaps in the shard metadata</title>
                <link>https://jira.mongodb.org/browse/SERVER-26471</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During chunk migration the recipient shard is not notified when the metadata reflecting the move is committed. This is not necessary because the recipient will be forced to refresh its metadata the first time it receives the new shard version from a mongos.&lt;/p&gt;

&lt;p&gt;Because of this property of the protocol, the recipient shard is free in turn to donate some other chunk as soon as the donor has entered the critical section and has requested that the recipient flushes all received documents.&lt;/p&gt;

&lt;p&gt;If a former recipient manages to donate a new chunk before the original migration commits, due to the incremental metadata refresh, this recipient will never have the originally donated chunk in its metadata and will keep filtering out documents for a chunk which it in fact owns.&lt;/p&gt;</description>
                <environment></environment>
        <key id="321326">SERVER-26471</key>
            <summary>Race between chunk metadata commit and an immediate move of a chunk from the donor may leave gaps in the shard metadata</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, 5 Oct 2016 17:37:21 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:01 +0000</updated>
                            <resolved>Sat, 8 Oct 2016 13:27:43 +0000</resolved>
                                    <version>3.4.0-rc0</version>
                                    <fixVersion>3.4.0-rc1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1403581" author="xgen-internal-githook" created="Sat, 8 Oct 2016 13:22:34 +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-26471&quot; title=&quot;Race between chunk metadata commit and an immediate move of a chunk from the donor may leave gaps in the shard metadata&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26471&quot;&gt;&lt;del&gt;SERVER-26471&lt;/del&gt;&lt;/a&gt; Always incrementally refresh metadata after committing chunk migration&lt;/p&gt;

&lt;p&gt;Also introduces a failpoint and js test to exercise the race condition.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/30b79f47f04926d972192ed06a1fa08620592b67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/30b79f47f04926d972192ed06a1fa08620592b67&lt;/a&gt;&lt;/p&gt;</comment>
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