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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-48981] Implement local isolation for fastcount for Biggie RecordStore</title>
                <link>https://jira.mongodb.org/browse/SERVER-48981</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Biggie implements fastcount similar to how it is implemented on WT. The fastcount get updated immediately on inserts and deletes before the write unit of work is committed. In case of a rollback it is adjusted back.&lt;/p&gt;

&lt;p&gt;However write conflicts on the biggie engine happens at commit time leading to the fastcount will be wrong until the commit where the write conflict is thrown. &lt;/p&gt;

&lt;p&gt;Running jstests/concurrency/fsm_workloads/upsert_unique_index.js over biggie triggers the following assert: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e57156eff2a2ff5dbb1b6a75fee246241206453f/src/mongo/db/storage/biggie/biggie_record_store.cpp#L576&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/e57156eff2a2ff5dbb1b6a75fee246241206453f/src/mongo/db/storage/biggie/biggie_record_store.cpp#L576&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The fastcount will go negative during the test above&lt;/p&gt;</description>
                <environment></environment>
        <key id="1384245">SERVER-48981</key>
            <summary>Implement local isolation for fastcount for Biggie RecordStore</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jun 2020 21:15:53 +0000</created>
                <updated>Fri, 27 Oct 2023 20:42:12 +0000</updated>
                            <resolved>Tue, 3 May 2022 16:25:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4523031" author="louis.williams" created="Tue, 3 May 2022 16:25:54 +0000"  >&lt;p&gt;Closing because we have removed EphemeralForTest&lt;/p&gt;</comment>
                            <comment id="3283240" author="xgen-internal-githook" created="Mon, 13 Jul 2020 19:38:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48981&quot; title=&quot;Implement local isolation for fastcount for Biggie RecordStore&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48981&quot;&gt;&lt;del&gt;SERVER-48981&lt;/del&gt;&lt;/a&gt; Remove invariant to guard against negative fastcount for biggie.&lt;/p&gt;

&lt;p&gt;Local isolation of the count is required to prevent negative values because how this storage engine emits write conflict exceptions.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37dee01bca27a957c5bef67121fe8dc93a6554c1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37dee01bca27a957c5bef67121fe8dc93a6554c1&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1025683">SERVER-44837</issuekey>
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