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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-33859] Prime the oplog manager&apos;s visibility timestamp with the top of oplog</title>
                <link>https://jira.mongodb.org/browse/SERVER-33859</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At startup, the &lt;tt&gt;`WiredTigerOplogManager::_oplogReadTimestamp`&lt;/tt&gt; is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c3bf7f3d621cbe2824db460bae9c80b75c4d7870/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;typically initialized&lt;/a&gt; to `1`. Currently, oplog readers getting a visibility timestamp are completely asynchronous with how that value is updated; an oplog reader that gets in quickly after startup can attempt to read with timestamp 1 and crash the server.&lt;/p&gt;

&lt;p&gt;Instead, it should be legal to initialize the value with &lt;tt&gt;`&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c3bf7f3d621cbe2824db460bae9c80b75c4d7870/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_oplogMaxAtStartup&lt;/a&gt;`&lt;/tt&gt;. That value may contain holes, but holes imply replication recovery will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2b2f4b65da/src/mongo/db/repl/replication_recovery.cpp#L262&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;truncate the oplog&lt;/a&gt; before accepting connections. A call to `&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c3bf7f3d621cbe2824db460bae9c80b75c4d7870/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L1676&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cappedTruncateAfter&lt;/a&gt;` will set the correct the value.&lt;/p&gt;</description>
                <environment></environment>
        <key id="510731">SERVER-33859</key>
            <summary>Prime the oplog manager&apos;s visibility timestamp with the top of oplog</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>rollback-functional</label>
                    </labels>
                <created>Tue, 13 Mar 2018 20:06:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:33:48 +0000</updated>
                            <resolved>Thu, 15 Mar 2018 01:19:38 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1834124" author="xgen-internal-githook" created="Wed, 14 Mar 2018 20:48:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33859&quot; title=&quot;Prime the oplog manager&amp;#39;s visibility timestamp with the top of oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33859&quot;&gt;&lt;del&gt;SERVER-33859&lt;/del&gt;&lt;/a&gt;: Prime oplog visibility to the top of oplog on startup.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/013e6f9faa161311368a7baf483cf45c6b585167&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/013e6f9faa161311368a7baf483cf45c6b585167&lt;/a&gt;&lt;/p&gt;</comment>
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