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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-57358] Build config.chunks indexes on background in FCV upgrade/downgrade</title>
                <link>https://jira.mongodb.org/browse/SERVER-57358</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During FCV upgrade/downgrade to 5.0 we build indexes on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ae43c162ec134c1c6ba2b768b68ff3fcba927b/src/mongo/db/s/config/sharding_catalog_manager.cpp#L849&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uuid_1_xxxx&lt;/a&gt; or &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ae43c162ec134c1c6ba2b768b68ff3fcba927b/src/mongo/db/s/config/sharding_catalog_manager.cpp#L994&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ns_1_xxxx&lt;/a&gt;. Currently this is done using ShardLocal::createIndexOnConfig, which essentially does a foreground index build because it&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ae43c162ec134c1c6ba2b768b68ff3fcba927b/src/mongo/db/s/shard_local.cpp#L147&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;holding the config.chunks collection lock for the duration of the build&lt;/a&gt;. As a consequence, DDL operations and catalog cache refreshes will queue behind this index build.&lt;/p&gt;

&lt;p&gt;This ticket is to change this so that it makes use of background index builds. We could use  &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ae43c162ec134c1c6ba2b768b68ff3fcba927b/src/mongo/client/dbclient_base.h#L502&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DBDirectClient createIndex&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1766282">SERVER-57358</key>
            <summary>Build config.chunks indexes on background in FCV upgrade/downgrade</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Jun 2021 15:37:08 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:47 +0000</updated>
                            <resolved>Fri, 4 Jun 2021 08:54:42 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4107615" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:31:26 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3859584" author="xgen-internal-githook" created="Fri, 4 Jun 2021 12:47:11 +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-57358&quot; title=&quot;Build config.chunks indexes on background in FCV upgrade/downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57358&quot;&gt;&lt;del&gt;SERVER-57358&lt;/del&gt;&lt;/a&gt; Build config.chunks indexes on background in FCV upgrade/downgrade&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bf6e0a139b783352c44dbc9db7334f406d78ffe0)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fa60b01bdae55a604fe21ec48d84924011d94a6b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fa60b01bdae55a604fe21ec48d84924011d94a6b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3859263" author="xgen-internal-githook" created="Fri, 4 Jun 2021 08:52:10 +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-57358&quot; title=&quot;Build config.chunks indexes on background in FCV upgrade/downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57358&quot;&gt;&lt;del&gt;SERVER-57358&lt;/del&gt;&lt;/a&gt; Build config.chunks indexes on background in FCV upgrade/downgrade&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bf6e0a139b783352c44dbc9db7334f406d78ffe0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bf6e0a139b783352c44dbc9db7334f406d78ffe0&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="186730">SERVER-17419</issuekey>
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