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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-82180] Capped inserts on the primary can have a different natural ordering from secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-82180</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Oplog slots can be reserved for inserts prior to taking an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v6.0/src/mongo/db/catalog/collection_impl.cpp#L998-L999&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;exclusive lock on the metadata resource&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This can generate the following ordering on the primary&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Insert 1&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Insert 2&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Reserve oplog slot with TS(1)&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Reserve oplog slot with TS(2)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;X-lock resource&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Insert document with RID(1)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;X-lock resource&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Insert document with RID(2)&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;On the secondary, we apply oplog entries serially for non-clustered capped collections. So we would apply oplog entry TS(1) with RID(1) and oplog entry TS(2) with RID(2) as record IDs are not globally unique. This results in a different natural order between the primary and secondaries, which we guarantee for capped collections.&lt;/p&gt;

&lt;p&gt;The same might be possible for updates and deletes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2474120">SERVER-82180</key>
            <summary>Capped inserts on the primary can have a different natural ordering from secondaries</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                            <label>former-storex-namer</label>
                    </labels>
                <created>Fri, 13 Oct 2023 16:25:36 +0000</created>
                <updated>Tue, 6 Feb 2024 20:31:50 +0000</updated>
                                            <version>6.0.11</version>
                                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="5859026" author="suganthi.mani" created="Mon, 6 Nov 2023 22:18:55 +0000"  >&lt;p&gt;Just a note: I recently filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82752&quot; title=&quot;Writers can skip acquiring resource metadata lock for capped collection in 4.4 and older versions.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82752&quot;&gt;&lt;del&gt;SERVER-82752&lt;/del&gt;&lt;/a&gt;  where capped writers may not acquire the collection metadata lock in 4.4 and older versions.  This bug can lead to have a natural ordering on primaries different from secondaries.  (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82752&quot; title=&quot;Writers can skip acquiring resource metadata lock for capped collection in 4.4 and older versions.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82752&quot;&gt;&lt;del&gt;SERVER-82752&lt;/del&gt;&lt;/a&gt; can occur only if it involves node restart).&lt;/p&gt;</comment>
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            <issuekey id="2489949">SERVER-82752</issuekey>
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