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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-41582] Investigate disallowing DBDirectClient from changing the storage engine ReadSource</title>
                <link>https://jira.mongodb.org/browse/SERVER-41582</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The fact that DBDirectClient is allowed to change the storage engine snapshot is the cause of many hard-to-reproduce bugs and many problems. DBDirectClient can early-returned in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6868af843a94de7b8e405b36f7f0a2ce1e160cbd/src/mongo/db/read_concern_mongod.cpp#L224&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;waitForReadConcern&lt;/a&gt;, which is already done for snapshot readConcern. Additionally, the logic in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6868af843a94de7b8e405b36f7f0a2ce1e160cbd/src/mongo/db/db_raii.cpp#L227&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AutoGetCollectionForRead&lt;/a&gt; allows DBDirectClient to potentially change the storage engine snapshot while another AutoGetCollectionForRead has read from a different snapshot (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41361&quot; title=&quot;Do not read at lastApplied while already holding the PBWM lock on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41361&quot;&gt;&lt;del&gt;SERVER-41361&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;We should investigate whether this behavior is actually necessary, and disallow it if possible.&lt;/p&gt;</description>
                <environment></environment>
        <key id="793747">SERVER-41582</key>
            <summary>Investigate disallowing DBDirectClient from changing the storage engine ReadSource</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>groomed</label>
                    </labels>
                <created>Fri, 7 Jun 2019 19:28:09 +0000</created>
                <updated>Tue, 6 Dec 2022 02:57:29 +0000</updated>
                            <resolved>Mon, 5 Oct 2020 18:47:02 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3426212" author="louis.williams" created="Mon, 5 Oct 2020 18:47:02 +0000"  >&lt;p&gt;As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48452&quot; title=&quot;Internal readers should default to reading without a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48452&quot;&gt;&lt;del&gt;SERVER-48452&lt;/del&gt;&lt;/a&gt;, internal operations read without a timestamp by default.&lt;/p&gt;

&lt;p&gt;That change also ensured that DBDirectClient behaves like any external network operation, as that is what callers expect. This means the DBDirectClient is allowed to change the Operation&apos;s ReadSource to read at lastApplied if that is what it requires, and I believe that is the correct thing to do.&lt;/p&gt;

&lt;p&gt;For that reason, I am closing this ticket.&lt;/p&gt;</comment>
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