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    <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-29693] &quot;lastAppliedOpTime&quot; value can sometimes be set to an optime ahead of uncommitted operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-29693</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, a PRIMARY node updates its lastAppliedOpTime value whenever any write operation commits: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8ec35cb932d07eb034beee2b1938800675fb3c0c/src/mongo/db/repl/oplog.cpp#L373&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/8ec35cb932d07eb034beee2b1938800675fb3c0c/src/mongo/db/repl/oplog.cpp#L373&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;On document-level-locking storage engines, writes can commit out of optime order.  This means that the use of lastAppliedOpTime to determine when it is safe to allow reads is not providing an assumed guarantee: that all operations prior to the lastAppliedOpTime will be visible.&lt;br/&gt;
In 3.4, the only operation that could run afoul of this is a read operation with readConcern: { level: &quot;local&quot;, afterOpTime: xxxx } (or afterOpTime with level majority in a one-voting-node replica set), but such operations are currently disallowed.  Thus, this bug is hidden from normal operation.&lt;br/&gt;
In a future release, we expect that this guarantee will be critical for the correct operation of read operations with read concerns utilizing  &quot;afterClusterTime&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="394867">SERVER-29693</key>
            <summary>&quot;lastAppliedOpTime&quot; value can sometimes be set to an optime ahead of uncommitted operations</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Jun 2017 18:57:27 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:57 +0000</updated>
                            <resolved>Tue, 22 Aug 2017 17:55:57 +0000</resolved>
                                                    <fixVersion>3.5.13</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1654115" author="xgen-internal-githook" created="Tue, 22 Aug 2017 17:49:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;milkie&apos;, &apos;email&apos;: &apos;milkie@10gen.com&apos;, &apos;name&apos;: &apos;Eric Milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29693&quot; title=&quot;&amp;quot;lastAppliedOpTime&amp;quot; value can sometimes be set to an optime ahead of uncommitted operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29693&quot;&gt;&lt;del&gt;SERVER-29693&lt;/del&gt;&lt;/a&gt; wait for all oplog writes to be visible for afterClusterTime and readConcern level local&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1602ed3a3b4b101f88be519b13dd69b1c0f04343&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1602ed3a3b4b101f88be519b13dd69b1c0f04343&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="392263">SERVER-29539</issuekey>
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            <issuekey id="359506">SERVER-28150</issuekey>
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