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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-63585] Fastcount gets out of sync when a delete rollbacks and another transaction deletes the same rows</title>
                <link>https://jira.mongodb.org/browse/SERVER-63585</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the WiredTigerRecordStore we keep track of the number of records we hold. When a transaction rollbacks we patch up the metadata so that eventually it stays in sync with the real number of rows, even though it can get out of sync if there&apos;s a crash.&lt;/p&gt;

&lt;p&gt;To fix up issues after a crash, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8ac145331880626e64bc4339763208140ade6609/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L1966-L1974&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;clamp the value to a positive integer&lt;/a&gt;&#160;however this can cause problems if there are rollbacks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Thread 1 deletes the last row, sets numRecords = 0&lt;/li&gt;
	&lt;li&gt;Thread 1 rollbacks, it rollbacks the WT transaction but hasn&apos;t fixed up the metadata yet&lt;/li&gt;
	&lt;li&gt;Thread 2 deletes the last row, numRecords is 0 so it clamps numRecords to 0 and commits.&lt;/li&gt;
	&lt;li&gt;Thread 1 fixes up the metadata by increasing numRecords by the same amount it reduced, numRecords = 1&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should allow negative values of numRecords so that the metadata patching process works correctly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1982100">SERVER-63585</key>
            <summary>Fastcount gets out of sync when a delete rollbacks and another transaction deletes the same rows</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="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Feb 2022 17:58:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:36 +0000</updated>
                            <resolved>Tue, 15 Feb 2022 15:06:18 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>4.4.18</fixVersion>
                    <fixVersion>5.0.14</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4941760" author="xgen-internal-githook" created="Mon, 31 Oct 2022 18:58:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel G&#243;mez Ferro&apos;, &apos;email&apos;: &apos;daniel.gomezferro@mongodb.com&apos;, &apos;username&apos;: &apos;dgomezferro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63585&quot; title=&quot;Fastcount gets out of sync when a delete rollbacks and another transaction deletes the same rows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63585&quot;&gt;&lt;del&gt;SERVER-63585&lt;/del&gt;&lt;/a&gt; Allow negative values in WTRecordStore::numRecords&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4884b778c88166a36bf10112f0c6b504db2d6ed7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4884b778c88166a36bf10112f0c6b504db2d6ed7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4941303" author="xgen-internal-githook" created="Mon, 31 Oct 2022 17:06:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel G&#243;mez Ferro&apos;, &apos;email&apos;: &apos;daniel.gomezferro@mongodb.com&apos;, &apos;username&apos;: &apos;dgomezferro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63585&quot; title=&quot;Fastcount gets out of sync when a delete rollbacks and another transaction deletes the same rows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63585&quot;&gt;&lt;del&gt;SERVER-63585&lt;/del&gt;&lt;/a&gt; Allow negative values in WTRecordStore::numRecords&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a58c20209f4b63c4032a4df6caa8df19bd58c22c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a58c20209f4b63c4032a4df6caa8df19bd58c22c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4898766" author="daniel.gottlieb@10gen.com" created="Wed, 12 Oct 2022 18:05:31 +0000"  >&lt;p&gt;I&apos;ve requested a backport as I came across a manifestation of this on a recent 5.0 patch run that resulted in some folks thinking they might have broke something.&lt;/p&gt;</comment>
                            <comment id="4356018" author="xgen-internal-githook" created="Tue, 15 Feb 2022 14:58:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel G&#243;mez Ferro&apos;, &apos;email&apos;: &apos;daniel.gomezferro@mongodb.com&apos;, &apos;username&apos;: &apos;dgomezferro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63585&quot; title=&quot;Fastcount gets out of sync when a delete rollbacks and another transaction deletes the same rows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63585&quot;&gt;&lt;del&gt;SERVER-63585&lt;/del&gt;&lt;/a&gt; Allow negative values in WTRecordStore::numRecords&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bbdf42ae03fdab670dbee8d5a154156aae5342a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bbdf42ae03fdab670dbee8d5a154156aae5342a9&lt;/a&gt;&lt;/p&gt;</comment>
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