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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-33258] Replication must create necessary steady-state internal tables before coming out of initial sync</title>
                <link>https://jira.mongodb.org/browse/SERVER-33258</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;KVStorageEngine implementations have their catalog persisted as &quot;yet another&quot; record store named the &lt;tt&gt;`_mdb_catalog`&lt;/tt&gt;. For storage engines that support &lt;tt&gt;`recoverToStableTimestamp`&lt;/tt&gt;, this table is not journaled, meaning it&apos;s only persisted when a stable checkpoint is taken, or from create collection oplog entries being replayed on replication recovery at startup.&lt;/p&gt;

&lt;p&gt;Replication, naturally, does not replicate its internal collections which can lead to the following sequence:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Exit initial sync at time T. T is also the stable timestamp.&lt;/li&gt;
	&lt;li&gt;Node becomes a secondary.&lt;/li&gt;
	&lt;li&gt;Create the &lt;tt&gt;`oplogTruncateAfterPoint`&lt;/tt&gt; collection.&lt;/li&gt;
	&lt;li&gt;Begin processing a patch, performing a write to the &lt;tt&gt;`oplogTruncateAfterPoint`&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;The node crashes. The &lt;tt&gt;`oplogTruncateAfterPoint`&lt;/tt&gt; document is required to correctly recover.&lt;/li&gt;
	&lt;li&gt;Node restarts.&lt;/li&gt;
	&lt;li&gt;MongoDB sees a storage engine table without a corresponding MongoDB collection, the table gets removed.&lt;/li&gt;
	&lt;li&gt;Replication recovery plays. Assumes there was no &lt;tt&gt;`oplogTruncateAfterPoint`&lt;/tt&gt;, resulting in data corruption.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Explicitly creating &lt;tt&gt;`oplogTruncateAfterPoint`&lt;/tt&gt; before coming out of initial sync is sufficient to guarantee that if a node starts up and decides it has completed initial sync, then the &lt;tt&gt;`oplogTruncateAfterPoint`&lt;/tt&gt; collection will exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="496260">SERVER-33258</key>
            <summary>Replication must create necessary steady-state internal tables before coming out of initial sync</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>rollback-functional</label>
                    </labels>
                <created>Sun, 11 Feb 2018 02:44:36 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:51 +0000</updated>
                            <resolved>Fri, 16 Feb 2018 21:24:23 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1808537" author="xgen-internal-githook" created="Fri, 16 Feb 2018 21:20:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33258&quot; title=&quot;Replication must create necessary steady-state internal tables before coming out of initial sync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33258&quot;&gt;&lt;del&gt;SERVER-33258&lt;/del&gt;&lt;/a&gt;: Guarantee replication tables are durable before use.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/902b8552f11697308604823c19d6dbce661fc3d6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/902b8552f11697308604823c19d6dbce661fc3d6&lt;/a&gt;&lt;/p&gt;</comment>
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