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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-41090] remove noop oplog entry DB X lock acquisition</title>
                <link>https://jira.mongodb.org/browse/SERVER-41090</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c34bc93a15cbb6fe8b222f12afac5adbab6f0737/src/mongo/db/repl/sync_tail.cpp#L333&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This lock&lt;/a&gt; seems unnecessary (and causes deadlocks), and at least should be acquired at a lower level if it&apos;s needed.&lt;/p&gt;

&lt;p&gt;I think this is here from when noop and index build oplog entry application were together and index builds needed this lock (&lt;a href=&quot;https://github.com/mongodb/mongo/commit/188fcbc3bf1ad7ff7f8114c33412fd9e27295c79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/188fcbc3bf1ad7ff7f8114c33412fd9e27295c79&lt;/a&gt;). When those two code paths were separated noops inherited this lock as well to be safe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="764261">SERVER-41090</key>
            <summary>remove noop oplog entry DB X lock acquisition</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>prepare_locking</label>
                    </labels>
                <created>Fri, 10 May 2019 17:54:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:09 +0000</updated>
                            <resolved>Mon, 13 May 2019 18:32:43 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2244859" author="xgen-internal-githook" created="Mon, 13 May 2019 18:28:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;, &apos;email&apos;: &apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41090&quot; title=&quot;remove noop oplog entry DB X lock acquisition&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41090&quot;&gt;&lt;del&gt;SERVER-41090&lt;/del&gt;&lt;/a&gt; remove noop oplog entry DB X lock acquisition&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1c15dffa313e6b2ab49284ad0d93c206e14cd054&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1c15dffa313e6b2ab49284ad0d93c206e14cd054&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2244155" author="milkie" created="Mon, 13 May 2019 12:52:03 +0000"  >&lt;p&gt;For the curious, it looks like it was me &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/warning.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; back in 2012:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bdded78e9f2ba6c703811a7e20e0b90adfc0d5b3#diff-04e89e83a90f31c93b1c3563db63c9c4R76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bdded78e9f2ba6c703811a7e20e0b90adfc0d5b3#diff-04e89e83a90f31c93b1c3563db63c9c4R76&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2244145" author="milkie" created="Mon, 13 May 2019 12:49:00 +0000"  >&lt;p&gt;I did some code archeology and this lock dates all the way back to when we first added DB level locking.  It fell out of the code logic and was not originally intentional for no-ops specifically.  Therefore, unless we can think of an assumption that a current use is making regarding this lock, I believe it&apos;s safe to remove.&lt;/p&gt;</comment>
                            <comment id="2244134" author="schwerin" created="Mon, 13 May 2019 12:34:45 +0000"  >&lt;p&gt;I wonder if this was here to support metadata-stable backup of sharded clusters the way it worked in ops manager prior to 4.2? That&apos;s my only guess for why it could have been intentional. Not relevant for 4.2 or later, I think.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Edit&lt;/b&gt; the above can&apos;t be right, since that would have been a reason to lock on primary nodes, not secondary.&lt;/p&gt;</comment>
                            <comment id="2242771" author="renctan" created="Fri, 10 May 2019 18:06:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt; I don&apos;t think so. The secondaries should be doing nothing when &quot;applying&quot; the no-op oplog entries generated by retryable-writes.&lt;/p&gt;</comment>
                            <comment id="2242745" author="judah.schvimer" created="Fri, 10 May 2019 17:57:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benety.goh&quot; class=&quot;user-hover&quot; rel=&quot;benety.goh&quot;&gt;benety.goh&lt;/a&gt;, do you have any insight into if this lock is required, since you authored the above &lt;a href=&quot;https://github.com/mongodb/mongo/commit/188fcbc3bf1ad7ff7f8114c33412fd9e27295c79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commit?&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt; or &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jack.mulrow&quot; class=&quot;user-hover&quot; rel=&quot;jack.mulrow&quot;&gt;jack.mulrow&lt;/a&gt;, do you know if retryable writes oplog application relies on this lock?&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xiangyu.yao&quot; class=&quot;user-hover&quot; rel=&quot;xiangyu.yao&quot;&gt;xiangyu.yao&lt;/a&gt;, did this come up at all in investigating &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39372&quot; title=&quot;Make secondary lock acquisition for DDL operations consistent with behavior on primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39372&quot;&gt;&lt;del&gt;SERVER-39372&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
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