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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42915] New style repair&apos;s catalog corrections are often false positives, aggressively marking repl nodes as corrupted</title>
                <link>https://jira.mongodb.org/browse/SERVER-42915</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It&apos;s a legal and expected state for MongoDB to be shutdown (cleanly or via a crash) when there are WT tables on disk, but the checkpointed MDB catalog does not have a collection referencing that table.&lt;/p&gt;

&lt;p&gt;Historically this could happen because open cursors would prevent table drops from succeeding. More recently, stable checkpoints can leave nodes in this state after a clean shutdown.&lt;/p&gt;

&lt;p&gt;Non-repair MongoDB startup cleans up these leftover tables. However, a node running new-style repair will create a new, &quot;anonymous&quot; collection in the local database to reference these tables for users to inspect their data and make a decision on what to do with it. In addition to re-linking the table into a collection, new-style repair writes a document signaling the node had corruption which keeps the node from rejoining the replica set as a dutiful member. Our powercycle testing gives us confidence that these repairs are likely false positives.&lt;/p&gt;

&lt;p&gt;To resolve this state, a user must resync or manually remove the document. Resyncing is expensive. It&apos;s not clear when it&apos;s safe to override the corruption document.&lt;/p&gt;

&lt;p&gt;Options for improving the user experience include:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Require MongoDB to always have a bijection (one to one relationship) between collection and tables.&lt;/li&gt;
	&lt;li&gt;Relaxing repair&apos;s requirement that a bijection exists between collections and tables.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="901150">SERVER-42915</key>
            <summary>New style repair&apos;s catalog corrections are often false positives, aggressively marking repl nodes as corrupted</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.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Aug 2019 15:15:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:54 +0000</updated>
                            <resolved>Mon, 9 Sep 2019 17:45:28 +0000</resolved>
                                                    <fixVersion>4.0.13</fixVersion>
                    <fixVersion>4.2.1</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2434692" author="xgen-internal-githook" created="Thu, 26 Sep 2019 15:37:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42915&quot; title=&quot;New style repair&amp;#39;s catalog corrections are often false positives, aggressively marking repl nodes as corrupted&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42915&quot;&gt;&lt;del&gt;SERVER-42915&lt;/del&gt;&lt;/a&gt;: Do not require a resync when repair encounters orphaned collection objects.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f4e387fa1b7e369ce067650bdda9c8676683b929)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1370d816a25a14f32eeb5990302c640eb872730&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1370d816a25a14f32eeb5990302c640eb872730&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2421354" author="xgen-internal-githook" created="Mon, 16 Sep 2019 14:10:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42915&quot; title=&quot;New style repair&amp;#39;s catalog corrections are often false positives, aggressively marking repl nodes as corrupted&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42915&quot;&gt;&lt;del&gt;SERVER-42915&lt;/del&gt;&lt;/a&gt;: Do not require a resync when repair encounters orphaned collection objects.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f4e387fa1b7e369ce067650bdda9c8676683b929)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/febbdd2456ab8e4526b8f1fa34f50989791216a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/febbdd2456ab8e4526b8f1fa34f50989791216a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2413243" author="xgen-internal-githook" created="Mon, 9 Sep 2019 18:04:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42915&quot; title=&quot;New style repair&amp;#39;s catalog corrections are often false positives, aggressively marking repl nodes as corrupted&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42915&quot;&gt;&lt;del&gt;SERVER-42915&lt;/del&gt;&lt;/a&gt;: Do not require a resync when repair encounters orphaned collection objects.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f4e387fa1b7e369ce067650bdda9c8676683b929&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f4e387fa1b7e369ce067650bdda9c8676683b929&lt;/a&gt;&lt;/p&gt;</comment>
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