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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-38218] AutoGetCollection doesn&apos;t need to call getPointInTimeReadTimestamp for non snapshot read concern levels</title>
                <link>https://jira.mongodb.org/browse/SERVER-38218</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Inside AutoGetCollection, we have a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74e5e8949bcc62bde1f1455b463fc89f07649ead/src/mongo/db/catalog_raii.cpp#L103-L119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;special block&lt;/a&gt; to check for pending catalog changes if the read concern level is &lt;tt&gt;kSnapshotReadConcern&lt;/tt&gt;. We &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74e5e8949bcc62bde1f1455b463fc89f07649ead/src/mongo/db/catalog_raii.cpp#L107&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;make a call&lt;/a&gt; to &lt;tt&gt;RecoveryUnit::getPointInTimeReadTimestamp&lt;/tt&gt; before checking for snapshot read concern. This means that we may call this when trying to acquire a collection lock but the read concern is non-snapshot. This is problematic if a command that uses a non snapshot read concern tries to set a read timestamp source on the recovery unit before calling AutoGetCollection. In WiredTiger, for example, we will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74e5e8949bcc62bde1f1455b463fc89f07649ead/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L317-L322&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; that a read timestamp has already been set. When we take a collection lock, the read timestamp may not have been set, but this is fine. We shouldn&apos;t invariant in this case. It should be simple enough to move the call inside that if statement, so that we only call it if we are sure we have snapshot read concern.&lt;/p&gt;</description>
                <environment></environment>
        <key id="636918">SERVER-38218</key>
            <summary>AutoGetCollection doesn&apos;t need to call getPointInTimeReadTimestamp for non snapshot read concern levels</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Nov 2018 05:08:27 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:25 +0000</updated>
                            <resolved>Wed, 21 Nov 2018 21:04:39 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2069472" author="xgen-internal-githook" created="Wed, 21 Nov 2018 21:03:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38218&quot; title=&quot;AutoGetCollection doesn&amp;#39;t need to call getPointInTimeReadTimestamp for non snapshot read concern levels&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38218&quot;&gt;&lt;del&gt;SERVER-38218&lt;/del&gt;&lt;/a&gt; AutoGetCollection doesn&apos;t need to call getPointInTimeReadTimestamp for non snapshot read concern levels&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c2879fca21a4a43c4e173115850b979b434cb88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c2879fca21a4a43c4e173115850b979b434cb88&lt;/a&gt;&lt;/p&gt;</comment>
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