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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-47439] IndexBuildsCoordinator::createIndexes() should generate createIndexes oplog entry (single phase index build) for building indexes on empty collection.</title>
                <link>https://jira.mongodb.org/browse/SERVER-47439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;jSince, on primary, we use IndexBuildsCoordinator::createIndexes() only to build system indexes and does not use the thread pool, I feel this createIndexes() should always generate the createIndexes oplog entry for the index build, considering it as a single phase index build. Also, building system indexes takes less time. So, it&apos;s ok for secondaries to do the system index build as foreground index build during steady state replication. By this we can make the behavior of not using thread pool consistent between primary and secondary.&lt;/p&gt;

&lt;p&gt;To be noted, it seems, this createIndexes() is called to&lt;br/&gt;
 1) create system Indexes during &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c2d9a6418ae34bd0821cfbc84cf78c854d058dd3/src/mongo/db/db.cpp#L497&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;startup&lt;/a&gt; (writes not replicated).&lt;br/&gt;
 2) create system Indexes during primary &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c2d9a6418ae34bd0821cfbc84cf78c854d058dd3/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L544&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drain&lt;/a&gt; phase (writes replicated).&lt;br/&gt;
 3) Secondaries oplog applier performing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c2d9a6418ae34bd0821cfbc84cf78c854d058dd3/src/mongo/db/repl/oplog.cpp#L203&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;foreground&lt;/a&gt; index building.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1309766">SERVER-47439</key>
            <summary>IndexBuildsCoordinator::createIndexes() should generate createIndexes oplog entry (single phase index build) for building indexes on empty collection.</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Apr 2020 16:38:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:43 +0000</updated>
                            <resolved>Thu, 23 Apr 2020 18:04:17 +0000</resolved>
                                                    <fixVersion>4.4.0-rc4</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3068447" author="xgen-internal-githook" created="Tue, 5 May 2020 01:54:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47439&quot; title=&quot;IndexBuildsCoordinator::createIndexes() should generate createIndexes oplog entry (single phase index build) for building indexes on empty collection.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47439&quot;&gt;&lt;del&gt;SERVER-47439&lt;/del&gt;&lt;/a&gt; build system indexes single-phased&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 906e1a72f98d42106c02914bf9cc1dd3101483ac)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c746480883a9bef1d6eb43149df9ec3a51cf1c12&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c746480883a9bef1d6eb43149df9ec3a51cf1c12&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3052381" author="xgen-internal-githook" created="Thu, 23 Apr 2020 10:36:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47439&quot; title=&quot;IndexBuildsCoordinator::createIndexes() should generate createIndexes oplog entry (single phase index build) for building indexes on empty collection.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47439&quot;&gt;&lt;del&gt;SERVER-47439&lt;/del&gt;&lt;/a&gt; build system indexes single-phased&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/906e1a72f98d42106c02914bf9cc1dd3101483ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/906e1a72f98d42106c02914bf9cc1dd3101483ac&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1297113">SERVER-47182</issuekey>
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