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    <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-61879] Refreshes to recover migrations must never join ongoing refreshes</title>
                <link>https://jira.mongodb.org/browse/SERVER-61879</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On step-up - more specifically during drain mode - a thread &lt;a href=&quot;https://github.com/mongodb/mongo/blob/20549d58943b586749d1570eee834c71bdef1b37/src/mongo/db/s/migration_util.cpp#L929-L930&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calling into onShardVersionMismatch&lt;/a&gt; is spawned in order to recover potential outstanding migrations.&lt;/p&gt;

&lt;p&gt;The implementation of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/20549d58943b586749d1570eee834c71bdef1b37/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L194&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;onShardVersionMismatch&lt;/a&gt; is assuming that - during drain mode - no other refresh could be running because user requests don&apos;t get served. However, this turns out to be incorrect because previously spawned refreshes are not killed on step-down/up as they are happening on a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/20549d58943b586749d1570eee834c71bdef1b37/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;different thread&lt;/a&gt; than the command that spawned them.&lt;/p&gt;

&lt;p&gt;It is then possible that the recovery on a primary node joins a refresh that started when the node was secondary, skipping the recovery.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1942034">SERVER-61879</key>
            <summary>Refreshes to recover migrations must never join ongoing refreshes</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Dec 2021 12:36:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:23 +0000</updated>
                            <resolved>Mon, 10 Jan 2022 15:51:01 +0000</resolved>
                                    <version>5.2.0</version>
                    <version>5.0.5</version>
                    <version>5.1.1</version>
                                    <fixVersion>5.0.8</fixVersion>
                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="4466927" author="xgen-internal-githook" created="Fri, 8 Apr 2022 10:16:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61879&quot; title=&quot;Refreshes to recover migrations must never join ongoing refreshes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61879&quot;&gt;&lt;del&gt;SERVER-61879&lt;/del&gt;&lt;/a&gt; Refreshes to recover migrations must never join ongoing refreshes&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4032e9512447e029fdddbc770826229e871f810&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4032e9512447e029fdddbc770826229e871f810&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4283243" author="xgen-internal-githook" created="Mon, 10 Jan 2022 15:47:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61879&quot; title=&quot;Refreshes to recover migrations must never join ongoing refreshes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61879&quot;&gt;&lt;del&gt;SERVER-61879&lt;/del&gt;&lt;/a&gt; Refreshes to recover migrations must never join ongoing refreshes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4abad42efb8a44b4b3fa40831e50060530b9938&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4abad42efb8a44b4b3fa40831e50060530b9938&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4253215" author="kaloian.manassiev" created="Thu, 16 Dec 2021 13:17:28 +0000"  >&lt;p&gt;I think the best way to address this would be to make the semantics of &lt;tt&gt;CSS::clearFilteringMetadata()&lt;/tt&gt; to match that of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f7867c703aa0f72e0554ad056a74115a5cacb95b/src/mongo/util/read_through_cache.h#L394&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ReadThroughCache::invalidate&lt;/tt&gt;&lt;/a&gt;. In other words it is guaranteed that once clearFilteringMetadata is called, the effects of any concurrently running &lt;tt&gt;onShardVersionMismatch&lt;/tt&gt;/&lt;a href=&quot;https://github.com/mongodb/mongo/blob/20549d58943b586749d1570eee834c71bdef1b37/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;recoverRefreshShardVersion&lt;/tt&gt;&lt;/a&gt; will not become visible.&lt;/p&gt;</comment>
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