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    <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>[DOCS-13775] Investigate changes in SERVER-47824: Ban transaction snapshot reads on capped collections</title>
                <link>https://jira.mongodb.org/browse/DOCS-13775</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;Transaction snapshot reads are now banned on capped collections.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;

&lt;p&gt;Capped collections typically (always?) delete records with an unreplicated/untimestamped write. Those deletions will always become visible in a newer transaction. So if a transaction uses snapshot with an atClusterTime (e.g. coming from mongos), it may not see some deleted documents even if they existed at the point in time requested.&lt;/p&gt;

&lt;p&gt;Snapshot transactions without atClusterTime might still work if the snapshot is open before the deletions happen probably because they hold onto the WT txn and the snapshot. But I am not 100% sure. Either way, it seems that we will still have to ban transaction snapshot reads on capped collections unless we choose to timestamp the capped collection deletions.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;p&gt;Pages to review and update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/read-concern-snapshot/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/read-concern-snapshot/&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/capped-collections/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/capped-collections/&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/transactions-operations/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/transactions-operations/&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="1414991">DOCS-13775</key>
            <summary>Investigate changes in SERVER-47824: Ban transaction snapshot reads on capped collections</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="naomi.pentrel@mongodb.com">Naomi Pentrel</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Jul 2020 18:28:41 +0000</created>
                <updated>Mon, 13 Nov 2023 18:04:01 +0000</updated>
                            <resolved>Thu, 11 Feb 2021 15:28:32 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3611758" author="xgen-internal-githook" created="Thu, 11 Feb 2021 16:05:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Naomi Pentrel&apos;, &apos;email&apos;: &apos;5212232+npentrel@users.noreply.github.com&apos;, &apos;username&apos;: &apos;npentrel&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13775&quot; title=&quot;Investigate changes in SERVER-47824: Ban transaction snapshot reads on capped collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13775&quot;&gt;&lt;del&gt;DOCS-13775&lt;/del&gt;&lt;/a&gt; Ban snapshot reads on capped colls&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/6a11e30f0dadb831bd854b746ca1e7b1f4293ed8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/6a11e30f0dadb831bd854b746ca1e7b1f4293ed8&lt;/a&gt;&lt;/p&gt;</comment>
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