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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>[DOCS-15986] Investigate changes in SERVER-74214: Cannot downgrade from fresh 6.2 due to oplog cap size</title>
                <link>https://jira.mongodb.org/browse/DOCS-15986</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &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;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    &lt;a href=&quot;https://www.mongodb.com/docs/manual/core/capped-collections/#create-a-capped-collection&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/core/capped-collections/#create-a-capped-collection&lt;/a&gt; is out of date.&lt;br/&gt;
Needs rework:&lt;br/&gt;
&quot;If the size field is less than or equal to 4096, then the collection will have a cap of 4096 bytes. Otherwise, MongoDB will raise the provided size to make it an integer multiple of 256.&quot;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67246&quot; title=&quot;Remove size multiple restriction on capped collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67246&quot;&gt;&lt;del&gt;SERVER-67246&lt;/del&gt;&lt;/a&gt; unlocked the ability for the oplog capped size to be anything, not just a multiple of 256.  This blocks fresh installs from downgrading.&lt;br/&gt;
I think we should fix this by adjusting the oplog cap size algorithm to go back to rounding to the nearest 256.  This will avoid problems with on-prem LTS users on 7.0 downgrading to 6.0.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2298040">DOCS-15986</key>
            <summary>Investigate changes in SERVER-74214: Cannot downgrade from fresh 6.2 due to oplog cap size</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="david.hou@mongodb.com">David Hou</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Sat, 25 Mar 2023 00:21:33 +0000</created>
                <updated>Mon, 13 Nov 2023 17:34:23 +0000</updated>
                            <resolved>Thu, 3 Aug 2023 21:22:20 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</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>3</watches>
                                                                                                                                                            <comments>
                            <comment id="5771158" author="JIRAUSER1260455" created="Wed, 11 Oct 2023 17:37:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.kneiser%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.kneiser@mongodb.com&quot;&gt;matt.kneiser@mongodb.com&lt;/a&gt; Thanks for the update - feel free to create a new DOCS ticket.&lt;/p&gt;</comment>
                            <comment id="5771128" author="JIRAUSER1263310" created="Wed, 11 Oct 2023 17:26:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.hou%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;david.hou@mongodb.com&quot;&gt;david.hou@mongodb.com&lt;/a&gt; I was mistaken during this docs review. The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v6.2/src/mongo/db/catalog/collection_options.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;relevant feature flag&lt;/a&gt; has been &lt;a href=&quot;https://github.com/10gen/mongo/blob/v6.2/src/mongo/db/catalog/collection_options.idl#L41-L42&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;enabled by default&lt;/a&gt; since 6.2 when this code landed in master. In 6.2+, non-oplog capped collections &lt;em&gt;do not&lt;/em&gt; get rounded. Do you want to make a new PR under this ticket or make a new DOCS ticket to reflect this? Up to you.&lt;/p&gt;</comment>
                            <comment id="5593667" author="JIRAUSER1260455" created="Wed, 26 Jul 2023 19:46:35 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.kneiser%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.kneiser@mongodb.com&quot;&gt;matt.kneiser@mongodb.com&lt;/a&gt; When you get a chance, can you review this small PR and confirm if this is the only necessary update? Thanks!&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/pull/4158&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/pull/4158&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5593654" author="JIRAUSER1260455" created="Wed, 26 Jul 2023 19:39:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74214&quot; title=&quot;Cannot downgrade from fresh 6.2 due to oplog cap size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74214&quot;&gt;&lt;del&gt;SERVER-74214&lt;/del&gt;&lt;/a&gt; adjusts the oplog cap size algorithm back to rounding to the nearest 256. This is already reflected in the documentation for v7.0: &lt;a href=&quot;https://www.mongodb.com/docs/v7.0/core/capped-collections/#create-a-capped-collection&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/v7.0/core/capped-collections/#create-a-capped-collection&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Based on the comment thread for &lt;del&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74214&quot; title=&quot;Cannot downgrade from fresh 6.2 due to oplog cap size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74214&quot;&gt;&lt;del&gt;SERVER-74214&lt;/del&gt;&lt;/a&gt;,&lt;/del&gt; looks like the only update is to add a note to downgrade docs to mention that we will not support downgrading from fresh installs.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
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            <issuekey id="2270671">SERVER-74214</issuekey>
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                            <subtask id="2405236">DOCS-16284</subtask>
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                            <customfieldvalue>&lt;a href=&quot;https://www.mongodb.com/docs/manual/core/capped-collections/#create-a-capped-collection&quot;&gt;https://www.mongodb.com/docs/manual/core/capped-collections/#create-a-capped-collection&lt;/a&gt; is out of date.&lt;br/&gt;
Needs rework:&lt;br/&gt;
&amp;quot;If the size field is less than or equal to 4096, then the collection will have a cap of 4096 bytes. Otherwise, MongoDB will raise the provided size to make it an integer multiple of 256.&amp;quot;</customfieldvalue>

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