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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-44609] Replicate startIndexBuild oplog entry in the same thread as the index build.</title>
                <link>https://jira.mongodb.org/browse/SERVER-44609</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We replicate the &quot;startIndexBuild&quot; oplog entry on the caller thread, then schedule the index build task on a thread pool. This leads to a deadlock scenario described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44250&quot; title=&quot;startIndexBuild oplog write and thread pool scheduling are not serialized between concurrent threads on primaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44250&quot;&gt;&lt;del&gt;SERVER-44250&lt;/del&gt;&lt;/a&gt;. That ticket will fix the issue with a mutex, but it depends on the internal queuing implementation of the thread pool.&lt;/p&gt;

&lt;p&gt;To guarantee index builds are scheduled correctly, we should really replicate the oplog entry on the index build thread, rather than the caller.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1001281">SERVER-44609</key>
            <summary>Replicate startIndexBuild oplog entry in the same thread as the index build.</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Nov 2019 18:29:32 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:59 +0000</updated>
                            <resolved>Tue, 3 Dec 2019 16:34:26 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2576293" author="xgen-internal-githook" created="Tue, 3 Dec 2019 03:19:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;username&apos;: &apos;louiswilliams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44609&quot; title=&quot;Replicate startIndexBuild oplog entry in the same thread as the index build.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44609&quot;&gt;&lt;del&gt;SERVER-44609&lt;/del&gt;&lt;/a&gt; Replicate startIndexBuild oplog entry in the same thread as the index build&lt;/p&gt;

&lt;p&gt;Instead of initializing and replicating the startIndexBuild oplog entry&lt;br/&gt;
on the caller thread, this moves that logic into the builder thread. This&lt;br/&gt;
change removes the need for a mutex which previously made that operation atomic.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d84c908c148e2bd8a4cecec7e4b417ebaacd91ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d84c908c148e2bd8a4cecec7e4b417ebaacd91ce&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="979428">SERVER-44250</issuekey>
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            <issuekey id="1061884">SERVER-45262</issuekey>
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