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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-33493] Have WT RTT rollback keep correct counts</title>
                <link>https://jira.mongodb.org/browse/SERVER-33493</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33488&quot; title=&quot;WT SizeStorer dislikes RTT&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33488&quot;&gt;&lt;del&gt;SERVER-33488&lt;/del&gt;&lt;/a&gt; describes how counts in RTT WT can diverge with reality across restarts. This ticket is for correcting counts across rollbacks. The proposal:&lt;/p&gt;

&lt;p&gt;Have the rollback op observer track the inserts/deletes being rolled back for each collection/UUID. Use this information to adjust counts.&lt;/p&gt;

&lt;p&gt;I expect this correction to not be crash-resistant so long as replication truncates the oplog before recovering forward from the stable point to the common point. In general, WT already has problems keeping correct counts across crashes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="502554">SERVER-33493</key>
            <summary>Have WT RTT rollback keep correct counts</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>rollback-non-functional</label>
                    </labels>
                <created>Mon, 26 Feb 2018 18:06:37 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:26 +0000</updated>
                            <resolved>Thu, 29 Mar 2018 19:40:19 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1849558" author="xgen-internal-githook" created="Thu, 29 Mar 2018 19:38:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;judah@mongodb.com&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33493&quot; title=&quot;Have WT RTT rollback keep correct counts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33493&quot;&gt;&lt;del&gt;SERVER-33493&lt;/del&gt;&lt;/a&gt; add jstest collection count validation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f2de49da9b28ee4e04534733db2748eae9e84124&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f2de49da9b28ee4e04534733db2748eae9e84124&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1849547" author="xgen-internal-githook" created="Thu, 29 Mar 2018 19:28:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;judah@mongodb.com&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33493&quot; title=&quot;Have WT RTT rollback keep correct counts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33493&quot;&gt;&lt;del&gt;SERVER-33493&lt;/del&gt;&lt;/a&gt; Have WT RTT rollback keep correct counts&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3aa30ddc4456422b1adeec437abb8efe3d4cfec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3aa30ddc4456422b1adeec437abb8efe3d4cfec&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1825138" author="greg.mckeon" created="Tue, 6 Mar 2018 21:27:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; Can you talk to Eliot and see what our plan is for this?&lt;/p&gt;</comment>
                            <comment id="1818660" author="judah.schvimer" created="Wed, 28 Feb 2018 16:17:32 +0000"  >&lt;p&gt;As part of this work, the rollback test fixture should begin to ensure that all collection fast-counts are equal to the equivalent itcount() result.&lt;/p&gt;</comment>
                            <comment id="1817561" author="greg.mckeon" created="Tue, 27 Feb 2018 19:07:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt; can you comment on how important having correct collection counts across rollbacks be for downstream consumers?&lt;/p&gt;</comment>
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