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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32147] Investigate if createIndexes is holding a global exclusive lock during oplog application</title>
                <link>https://jira.mongodb.org/browse/SERVER-32147</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 3.6 we started replicating createIndexes as a command. Commands get applied under the global exclusive lock: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/repl/sync_tail.cpp#L394-L405&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/repl/sync_tail.cpp#L394-L405&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;I think this means we&apos;re now applying createIndexes oplog entries under a global exclusive lock which could take a long time. &lt;/p&gt;</description>
                <environment></environment>
        <key id="467109">SERVER-32147</key>
            <summary>Investigate if createIndexes is holding a global exclusive lock during oplog application</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Dec 2017 21:25:50 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:04 +0000</updated>
                            <resolved>Thu, 14 Dec 2017 19:13:53 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1740703" author="milkie" created="Sat, 2 Dec 2017 02:02:53 +0000"  >&lt;p&gt;tryPopAndWaitForMore() already treats inserts into system.indexes the same as &#8216;c&#8217; ops when making a new batch. &lt;/p&gt;</comment>
                            <comment id="1740586" author="spencer" created="Fri, 1 Dec 2017 22:08:17 +0000"  >&lt;p&gt;Thinking about this more I think &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; is right.  We already freeze the world during secondary oplog application via the ParallelBatchWriterLock, so taking the global X lock additionally shouldn&apos;t add much overhead.  The only difference is that the createIndex would now be processed in a batch on its own instead of alongside other ops, but the impact of that should be small relative to the cost of doing an index build.&lt;/p&gt;</comment>
                            <comment id="1740524" author="milkie" created="Fri, 1 Dec 2017 21:28:50 +0000"  >&lt;p&gt;Why would it take longer than building an index via an insert into system.indexes?&lt;/p&gt;</comment>
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