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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-56262] Fix _cappedFirstRecord usage for capped collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-56262</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;capped_large_docs.js&lt;/tt&gt; and &lt;tt&gt;create_capped_collection_maxdocs.js&lt;/tt&gt; both use the&#160; &lt;tt&gt;requires_non_retryable_writes&lt;/tt&gt; tag due to a rare occurrence where the capacity of the capped collection is exceeded by one. We should investigate the cause of this and fix it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1687206">SERVER-56262</key>
            <summary>Fix _cappedFirstRecord usage for 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="13201">Fixed</resolution>
                                        <assignee username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Apr 2021 13:58:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:39 +0000</updated>
                            <resolved>Fri, 30 Apr 2021 19:15:02 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3749599" author="xgen-internal-githook" created="Fri, 30 Apr 2021 19:14:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56262&quot; title=&quot;Fix _cappedFirstRecord usage for capped collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56262&quot;&gt;&lt;del&gt;SERVER-56262&lt;/del&gt;&lt;/a&gt; Fix _cappedFirstRecord usage for capped collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bba00a925c257e4ae8c5a6ec13b66890f8433302&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bba00a925c257e4ae8c5a6ec13b66890f8433302&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3740885" author="geert.bosch" created="Tue, 27 Apr 2021 13:15:04 +0000"  >&lt;p&gt;Just following up on some approaches to fix the cached first record. It absolutely should be possible to correctly maintain the cached first record accurately. I would consider it data corruption if we delete record 11 but not delete record 10. I &lt;em&gt;thought&lt;/em&gt; that we serialized writes using the capped lock. However, regardless, while one transaction is in the critical section of deleting a record but not yet having committed the delete, it should prevent others from going ahead and committing transactions. One way to do that is marking the start of the critical section with some atomic flag or special value of the cached first record and only resetting it in the &lt;tt&gt;onCommit&lt;/tt&gt; handler. Any conflicting operation can find out in its &lt;tt&gt;OpObserver&lt;/tt&gt; and abort with a &lt;tt&gt;WriteConflictException&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;In general, we should not change shared data and undo those changes in &lt;tt&gt;onRollback&lt;/tt&gt; as it can break isolation and leak a partial transaction.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="2423182">SERVER-80302</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="168240">SERVER-16049</issuekey>
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