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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-44820] bgSync grabs DBLock in X mode when reading the oplog</title>
                <link>https://jira.mongodb.org/browse/SERVER-44820</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, bgsync grabs the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/91fc73a60e523e40defcaa8b6cd808a3091aec34/src/mongo/db/repl/bgsync.cpp#L773&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;database lock in X mode to read the lastAppliedOpTime&lt;/a&gt;. We should investigate to see if we can use a global IS lock here which is what we usually do when reading the oplog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1024103">SERVER-44820</key>
            <summary>bgSync grabs DBLock in X mode when reading the oplog</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="jason.chan@mongodb.com">Jason Chan</assignee>
                                    <reporter username="jason.chan@mongodb.com">Jason Chan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Nov 2019 15:11:14 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:37 +0000</updated>
                            <resolved>Thu, 5 Dec 2019 19:57:17 +0000</resolved>
                                    <version>4.3.1</version>
                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2586711" author="xgen-internal-githook" created="Thu, 5 Dec 2019 19:54:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;name&apos;: &apos;Jason Chan&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44820&quot; title=&quot;bgSync grabs DBLock in X mode when reading the oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44820&quot;&gt;&lt;del&gt;SERVER-44820&lt;/del&gt;&lt;/a&gt; Remove outer database MODE_X lock when reading the lastAppliedOpTime in bgsync&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/68ceed74cb9ee4686825d24e41e5d6bb3800334a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/68ceed74cb9ee4686825d24e41e5d6bb3800334a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2585984" author="jason.chan" created="Thu, 5 Dec 2019 15:40:20 +0000"  >&lt;p&gt;Since Helpers::getLast already grabs a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d241f076b1b38bb0e38b43ddd592b3f2a51adea2/src/mongo/db/dbhelpers.cpp#L196&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;collection level lock&lt;/a&gt;, it should be safe to remove the outer database lock in MODE_X. We decided to refrain from using the new helper added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43656&quot; title=&quot;Return the timestamp of the top of the oplog in the storage integration layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43656&quot;&gt;&lt;del&gt;SERVER-43656&lt;/del&gt;&lt;/a&gt; since it is currently only available through the record store which would require creating a collection object (and grabbing a collection level lock as well). We expect &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39364&quot; title=&quot;Audit uses of setLastOpToSystemLastOpTime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39364&quot;&gt;&lt;del&gt;SERVER-39364&lt;/del&gt;&lt;/a&gt; to add an interface that will allow us to grab the lastAppliedOpTime while only acquiring a global MODE_IS lock so we can reconsider using the new mechanism here once that is available.&lt;/p&gt;</comment>
                            <comment id="2566345" author="daniel.gottlieb@10gen.com" created="Tue, 26 Nov 2019 14:49:04 +0000"  >&lt;p&gt;Not all storage engine&apos;s support this (so the existing code can&apos;t go away entirely), but &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43656&quot; title=&quot;Return the timestamp of the top of the oplog in the storage integration layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43656&quot;&gt;&lt;del&gt;SERVER-43656&lt;/del&gt;&lt;/a&gt; supports this with a global MODE_IS lock.&lt;/p&gt;</comment>
                            <comment id="2564508" author="judah.schvimer" created="Mon, 25 Nov 2019 15:28:10 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;&lt;/p&gt;</comment>
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