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    <title>MongoDB Jira</title>
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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-74214] Cannot downgrade from fresh 6.2 due to oplog cap size</title>
                <link>https://jira.mongodb.org/browse/SERVER-74214</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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="2270671">SERVER-74214</key>
            <summary>Cannot downgrade from fresh 6.2 due to oplog cap size</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="matt.kneiser@mongodb.com">Matt Kneiser</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Feb 2023 15:34:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:57 +0000</updated>
                            <resolved>Sat, 25 Mar 2023 00:21:32 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5299782" author="xgen-internal-githook" created="Fri, 24 Mar 2023 19:42:03 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Matt Kneiser&apos;, &apos;email&apos;: &apos;matt.kneiser@mongodb.com&apos;, &apos;username&apos;: &apos;themattman&apos;}
&lt;p&gt;Message: &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; New oplog size should be a multiple of 256 for back-compat&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/56d9c847ef0b81902c80c3f8aa4c921049f02a43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/56d9c847ef0b81902c80c3f8aa4c921049f02a43&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5226794" author="connie.chen" created="Thu, 23 Feb 2023 21:34:04 +0000"  >&lt;p&gt;We should aim to complete this before 7.0, at triage we should assign the 7.0 required fixversion&lt;/p&gt;</comment>
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            <issuekey id="2298040">DOCS-15986</issuekey>
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            <issuekey id="2067639">SERVER-67246</issuekey>
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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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