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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-70793] Make database metadata refresh first check new metadata under the IS lock before taking X lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-70793</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;`onDbVersionMismatch`, when not invoked with a `&lt;a href=&quot;https://github.com/mongodb/mongo/blob/525334b580816f2320d9a518b7d9eff908678ce9/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L201&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;receivedDbVersion&lt;/a&gt;`, after getting the latest metadata from the configsvr will unconditionally attempt to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/525334b580816f2320d9a518b7d9eff908678ce9/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire the DB lock in MODE_X&lt;/a&gt;, even if the received metadata is not newer than the cached one. Taking the DB lock in MODE_X is expensive, as it serialized with any ongoing writer or transaction on that db. This causes stalls on the user workload.&lt;/p&gt;

&lt;p&gt;Before &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66972&quot; title=&quot;Database critical section does not serialize with ongoing refreshes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66972&quot;&gt;&lt;del&gt;SERVER-66972&lt;/del&gt;&lt;/a&gt;, there used to be an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6acc65f52de00bd9caa45e582e65a8669424b4dc/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L510-L529&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;early check under the IS lock&lt;/a&gt; to exit early if the received version is not newer than the cached. This early check should be reintroduced  to reduce the impact caused by secondaries calling _flushDatabaseCacheUpdates.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2165131">SERVER-70793</key>
            <summary>Make database metadata refresh first check new metadata under the IS lock before taking X lock</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="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Oct 2022 13:09:58 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:34 +0000</updated>
                            <resolved>Tue, 8 Nov 2022 14:27:57 +0000</resolved>
                                                    <fixVersion>6.1.1</fixVersion>
                    <fixVersion>5.0.14</fixVersion>
                    <fixVersion>6.0.4</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4971512" author="xgen-internal-githook" created="Thu, 10 Nov 2022 17:38:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70793&quot; title=&quot;Make database metadata refresh first check new metadata under the IS lock before taking X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70793&quot;&gt;&lt;del&gt;SERVER-70793&lt;/del&gt;&lt;/a&gt; Make database metadata refresh first check new metadata under the IS lock before taking X lock&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1b3b0073a0b436a8a502b612f24fb2bd572772e5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1b3b0073a0b436a8a502b612f24fb2bd572772e5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4967876" author="xgen-internal-githook" created="Wed, 9 Nov 2022 17:59:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70793&quot; title=&quot;Make database metadata refresh first check new metadata under the IS lock before taking X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70793&quot;&gt;&lt;del&gt;SERVER-70793&lt;/del&gt;&lt;/a&gt; Make database metadata refresh first check new metadata under the IS lock before taking X lock&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/024a3693d888584cb3b10efd4cf5e9749cefc613&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/024a3693d888584cb3b10efd4cf5e9749cefc613&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4967129" author="xgen-internal-githook" created="Wed, 9 Nov 2022 15:25:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70793&quot; title=&quot;Make database metadata refresh first check new metadata under the IS lock before taking X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70793&quot;&gt;&lt;del&gt;SERVER-70793&lt;/del&gt;&lt;/a&gt; Make database metadata refresh first check new metadata under the IS lock before taking X lock&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/78d555f1c06d73df273fc0b47ac4d2b69e7a618e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/78d555f1c06d73df273fc0b47ac4d2b69e7a618e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4963179" author="xgen-internal-githook" created="Tue, 8 Nov 2022 14:27:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70793&quot; title=&quot;Make database metadata refresh first check new metadata under the IS lock before taking X lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70793&quot;&gt;&lt;del&gt;SERVER-70793&lt;/del&gt;&lt;/a&gt; Make database metadata refresh first check new metadata under the IS lock before taking X lock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac0a38a08ac02d83632b1d82b7c3c5b6e5276b41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac0a38a08ac02d83632b1d82b7c3c5b6e5276b41&lt;/a&gt;&lt;/p&gt;</comment>
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