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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-22995] Protect TopologyCoordinator with mutex rather than single thread executor</title>
                <link>https://jira.mongodb.org/browse/SERVER-22995</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TopologyCoordinator is protected by using a single thread executor currently. This task is to move its function calls out of the executor whenever it&apos;s possible and protect it with a mutex.&lt;/p&gt;</description>
                <environment></environment>
        <key id="270592">SERVER-22995</key>
            <summary>Protect TopologyCoordinator with mutex rather than single thread executor</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="9">Done</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Mar 2016 22:00:00 +0000</created>
                <updated>Thu, 2 Feb 2017 19:49:16 +0000</updated>
                            <resolved>Thu, 14 Apr 2016 18:36:16 +0000</resolved>
                                                    <fixVersion>3.3.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1237724" author="xgen-internal-githook" created="Fri, 15 Apr 2016 21:45:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22995&quot; title=&quot;Protect TopologyCoordinator with mutex rather than single thread executor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22995&quot;&gt;&lt;del&gt;SERVER-22995&lt;/del&gt;&lt;/a&gt; Fix synchronization of DBWorker in unittests.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/04f48bd5ae704d3a8df8bf7b8864d7258f4241e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/04f48bd5ae704d3a8df8bf7b8864d7258f4241e3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1236200" author="xgen-internal-githook" created="Thu, 14 Apr 2016 18:35:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22995&quot; title=&quot;Protect TopologyCoordinator with mutex rather than single thread executor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22995&quot;&gt;&lt;del&gt;SERVER-22995&lt;/del&gt;&lt;/a&gt; Break the cycle of shared_ptr involving ScatterGatherRunner.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4562dd814feb56086d1af158a64e5dad3a6018aa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4562dd814feb56086d1af158a64e5dad3a6018aa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1233867" author="xgen-internal-githook" created="Tue, 12 Apr 2016 21:09:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22995&quot; title=&quot;Protect TopologyCoordinator with mutex rather than single thread executor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22995&quot;&gt;&lt;del&gt;SERVER-22995&lt;/del&gt;&lt;/a&gt; Protect TopoCoord with mutex rather than single thread executor.&lt;/p&gt;

&lt;p&gt;Move scatter gather runner out of executor and protect the runner with its own mutex.&lt;br/&gt;
Replace onComplete with callbacks scheduled on finish event.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ded60f5d4254f08d76ccdf0d3a694d473bd14100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ded60f5d4254f08d76ccdf0d3a694d473bd14100&lt;/a&gt;&lt;/p&gt;</comment>
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