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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-77399] Remove preallocateSnapshotForOplogRead()</title>
                <link>https://jira.mongodb.org/browse/SERVER-77399</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we need to preallocate a snapshot differently &lt;a href=&quot;https://github.com/10gen/mongo/blob/30e5d822f6be7508f73e984b89ec23b27a21aa1d/src/mongo/db/db_raii.cpp#L513-L519&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if we are reading from the oplog or not&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;When we call &lt;tt&gt;preallocateSnapshotForOplogRead()&lt;/tt&gt; we set the &lt;tt&gt;_isOplogReader&lt;/tt&gt; flag in the &lt;tt&gt;WiredTigerRecoveryUnit&lt;/tt&gt;, which is used &lt;a href=&quot;https://github.com/10gen/mongo/blob/30e5d822f6be7508f73e984b89ec23b27a21aa1d/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L492-L494&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when opening a snapshot&lt;/a&gt; and then &lt;a href=&quot;https://github.com/10gen/mongo/blob/30e5d822f6be7508f73e984b89ec23b27a21aa1d/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L223-L230&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when getting the oplog visibility TS&lt;/a&gt; (which &lt;a href=&quot;https://github.com/10gen/mongo/blob/c1cbf3cc361d90f50023afc5a78dd55ef2230312/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L2154-L2159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is called from here&lt;/a&gt;, only when reading from the oplog).&lt;/p&gt;

&lt;p&gt;We should remove this logic and always assume we could be reading from the oplog. For that we&apos;d just need to always set &lt;tt&gt;_oplogVisibleTs&lt;/tt&gt; (when ReadSource is &lt;tt&gt;kNoTimestamp&lt;/tt&gt;), that cost would be &lt;a href=&quot;https://github.com/10gen/mongo/blob/c1cbf3cc361d90f50023afc5a78dd55ef2230312/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L279-L281&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an atomic word read&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2348091">SERVER-77399</key>
            <summary>Remove preallocateSnapshotForOplogRead()</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="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 May 2023 14:20:35 +0000</created>
                <updated>Sun, 29 Oct 2023 21:21:02 +0000</updated>
                            <resolved>Thu, 6 Jul 2023 13:03:34 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5545168" author="xgen-internal-githook" created="Wed, 5 Jul 2023 17:39:37 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Daniel G&#243;mez Ferro&apos;, &apos;email&apos;: &apos;daniel.gomezferro@mongodb.com&apos;, &apos;username&apos;: &apos;dgomezferro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77399&quot; title=&quot;Remove preallocateSnapshotForOplogRead()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77399&quot;&gt;&lt;del&gt;SERVER-77399&lt;/del&gt;&lt;/a&gt; Remove preallocateSnapshotForOplogRead()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/41233098125139736e37a8a0dc3d174b7a28a803&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/41233098125139736e37a8a0dc3d174b7a28a803&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2351268">SERVER-77507</issuekey>
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