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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-30081] Add a WiredTigerKVEngine &quot;recovery&quot; method that reconciles the _mdb_catalog and WT tables.</title>
                <link>https://jira.mongodb.org/browse/SERVER-30081</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="402323">SERVER-30081</key>
            <summary>Add a WiredTigerKVEngine &quot;recovery&quot; method that reconciles the _mdb_catalog and WT tables.</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>
                    </labels>
                <created>Mon, 10 Jul 2017 20:46:45 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:20 +0000</updated>
                            <resolved>Tue, 15 Aug 2017 18:30:23 +0000</resolved>
                                                    <fixVersion>3.5.12</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1648841" author="xgen-internal-githook" created="Tue, 15 Aug 2017 18:30:26 +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-30081&quot; title=&quot;Add a WiredTigerKVEngine &amp;quot;recovery&amp;quot; method that reconciles the _mdb_catalog and WT tables.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30081&quot;&gt;&lt;del&gt;SERVER-30081&lt;/del&gt;&lt;/a&gt;: Run storage recovery at startup.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3138119968a4d5bb7602bc766762d571ae5cd248&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3138119968a4d5bb7602bc766762d571ae5cd248&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1631678" author="daniel.gottlieb@10gen.com" created="Tue, 25 Jul 2017 21:23:31 +0000"  >&lt;p&gt;WT table creation/deletion are not part of transactions. After the `_mdb_catalog` is rolled back (via replication rollback or a node starting up from a &quot;stable&quot; checkpoint), some state may need to be reconciled. The cases to consider:&lt;/p&gt;

&lt;p&gt;Case 1: The _mdb_catalog references a collection ident that WiredTiger does not know of. This would imply a collection drop was rolled back. This is an illegal case and should result in a crash.&lt;br/&gt;
Case 2: The _mdb_catalog references an index ident that WiredTiger does not know of. This implies an index drop was rolled back. This method will recreate the index from the bson index specification found in the _mdb_catalog.&lt;br/&gt;
Case 3: WiredTiger has an ident (`collection-` or `index-`) that is not referenced in the `_mdb_catalog`. This implies a collection/index creation was rolled back. The WT table will be dropped.&lt;/p&gt;

&lt;p&gt;Because this method will be run at `mongod` startup, possibly during StorageEngine initialization, it may not be legal to use methods that have side-effects on the in-memory catalog.&lt;/p&gt;</comment>
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            <issuekey id="383656">SERVER-29213</issuekey>
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