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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>[DOCS-13166] Investigate changes in SERVER-44029: Remove global X lock for replSetResizeOplog</title>
                <link>https://jira.mongodb.org/browse/DOCS-13166</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    The &apos;replSetResizeOplog&apos; command does not take a global write lock anymore. It now uses an exclusive collection lock on the oplog collection.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Remove global X lock acquisition for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8d5fc650b1c3a38a9d4630a48fe856eba56d6171/src/mongo/db/commands/resize_oplog.cpp#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;replSetResizeOplog&lt;/tt&gt;&lt;/a&gt;. This is because acquiring global lock in X mode can be blocked by prepared transactions. The enqueued global X lock can block oplog queries which need the global IS lock. If these oplog queries and the data replication are needed to satisfy the prepared transaction&apos;s write concern, then the prepare transaction and replication cannot make progress. Thus a deadlock occurs.&lt;/p&gt;

&lt;p&gt;Alternatively, if removing global X lock is not an option, deprecate the command or make sure it won&apos;t be blocked on prepare transactions.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="977627">DOCS-13166</key>
            <summary>Investigate changes in SERVER-44029: Remove global X lock for replSetResizeOplog</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="ravind.kumar">Ravind Kumar</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Oct 2019 20:22:07 +0000</created>
                <updated>Mon, 13 Nov 2023 18:14:41 +0000</updated>
                            <resolved>Mon, 13 Jan 2020 16:32:38 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.2</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2722623" author="xgen-internal-githook" created="Mon, 13 Jan 2020 18:53:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ravind Kumar&apos;, &apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13191&quot; title=&quot;Investigate changes in SERVER-44026: Remove global X lock for reIndex &quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13191&quot;&gt;&lt;del&gt;DOCS-13191&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13166&quot; title=&quot;Investigate changes in SERVER-44029: Remove global X lock for replSetResizeOplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13166&quot;&gt;&lt;del&gt;DOCS-13166&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13170&quot; title=&quot;Investigate changes in SERVER-44027: Remove global X lock for renameCollection between DBs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13170&quot;&gt;&lt;del&gt;DOCS-13170&lt;/del&gt;&lt;/a&gt;: (v4.0 backport)&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Apply formatting optimizations from v4.2/master&lt;/li&gt;
	&lt;li&gt;Correct locking information for  reIndex, replSetResizeOplog, renameCollection&lt;/li&gt;
	&lt;li&gt;Cleanup/Removal of incorrect global locking information&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f7507f9b9969279901838b70fe7e38cb94023412&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f7507f9b9969279901838b70fe7e38cb94023412&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="2722151" author="xgen-internal-githook" created="Mon, 13 Jan 2020 16:31:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ravind Kumar&apos;, &apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13191&quot; title=&quot;Investigate changes in SERVER-44026: Remove global X lock for reIndex &quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13191&quot;&gt;&lt;del&gt;DOCS-13191&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13166&quot; title=&quot;Investigate changes in SERVER-44029: Remove global X lock for replSetResizeOplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13166&quot;&gt;&lt;del&gt;DOCS-13166&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13170&quot; title=&quot;Investigate changes in SERVER-44027: Remove global X lock for renameCollection between DBs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13170&quot;&gt;&lt;del&gt;DOCS-13170&lt;/del&gt;&lt;/a&gt;: remove global locks from reIndex, replSetResizeOplog, renameCollection&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Cleanup/Removal of incorrect global locking information&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f4e2675a4b236181de9bde85f46ba0aab1f07445&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f4e2675a4b236181de9bde85f46ba0aab1f07445&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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