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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-48452] Internal readers should default to reading without a timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-48452</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Internal readers should default to using the kNoTimestamp ReadSource. Users of AutoGetCollectionForRead are subject to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1ce8854a652e08d796621e268cc0c40ed1d56915/src/mongo/db/db_raii.cpp#L141&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;having their ReadSource changed&lt;/a&gt;, which is not always desirable and leads to unexpected behavior.&lt;/p&gt;

&lt;p&gt;Since internal readers have a &quot;local&quot; readConcern by default, despite not originating from a command, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1ce8854a652e08d796621e268cc0c40ed1d56915/src/mongo/db/storage/snapshot_helper.cpp#L47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;they are still eligible for changing their ReadSource&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Only reads originating from commands should change their ReadSource.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1364002">SERVER-48452</key>
            <summary>Internal readers should default to reading without a timestamp</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 27 May 2020 19:01:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:43 +0000</updated>
                            <resolved>Thu, 10 Sep 2020 18:25:18 +0000</resolved>
                                    <version>4.4.0</version>
                                    <fixVersion>4.8.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3394984" author="xgen-internal-githook" created="Tue, 15 Sep 2020 17:11:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &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 readers should default to reading without a timestamp&lt;/p&gt;

&lt;p&gt;Removes ReadSource::kUnset in favor of kNoTimestamp as the default&lt;/p&gt;

&lt;p&gt;Makes the following behavioral changes to AutoGetCollectionForRead:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Removes special early-return handling for kNoTimestamp&lt;/li&gt;
	&lt;li&gt;Only user or DBDirectClient operations are eligible to read at&lt;br/&gt;
  kLastApplied.&lt;/li&gt;
	&lt;li&gt;Operations only read at kLastApplied when in the SECONDARY state, nothing&lt;br/&gt;
  else. This means most internal operations that use DBDirectClient do not need&lt;br/&gt;
  to use a ReadSourceScope to ensure they read at kNoTimestamp.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit 11c68393df88a6f1ea4855e6ac15e54ca9f9d976)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a68bbe9d37f0c576295016919c9e0595c4ec1427&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a68bbe9d37f0c576295016919c9e0595c4ec1427&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3385976" author="xgen-internal-githook" created="Thu, 10 Sep 2020 18:15:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &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 readers should default to reading without a timestamp&lt;/p&gt;

&lt;p&gt;Removes ReadSource::kUnset in favor of kNoTimestamp as the default&lt;/p&gt;

&lt;p&gt;Makes the following behavioral changes to AutoGetCollectionForRead:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Removes special early-return handling for kNoTimestamp&lt;/li&gt;
	&lt;li&gt;Only user or DBDirectClient operations are eligible to read at&lt;br/&gt;
  kLastApplied.&lt;/li&gt;
	&lt;li&gt;Operations only read at kLastApplied when in the SECONDARY state, nothing&lt;br/&gt;
  else. This means most internal operations that use DBDirectClient do not need&lt;br/&gt;
  to use a ReadSourceScope to ensure they read at kNoTimestamp.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/11c68393df88a6f1ea4855e6ac15e54ca9f9d976&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/11c68393df88a6f1ea4855e6ac15e54ca9f9d976&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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            <issuekey id="2416170">SERVER-79955</issuekey>
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