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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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            <title>[SERVER-38606] Stop allowing NamespaceNotFound errors during startup replication recovery. The oplog replay logic will abort on NamespaceNotFound errors while applying CRUD operations.</title>
                <link>https://jira.mongodb.org/browse/SERVER-38606</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the old 4.0-style two phase drop, if the server crashes after the actual WT table drop and before a newer checkpoint has been generated (see below), after restart we will have a state where collection is in mdb_catalog but not backed by any WT tables.&lt;br/&gt;
-------- Checkpoint ---- Rename ------------- Actual Drop -------- Server Crash&lt;/p&gt;

&lt;p&gt;Therefore we chose to allow NamespaceNotFound errors in replication recovery.&lt;/p&gt;

&lt;p&gt;After we&apos;ve done the new 4.2-style two phase drop, this error should never happen during replication recovery because the actual WT table drop will always happen after a stable checkpoint which includes the mdb_catalog changes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="653036">SERVER-38606</key>
            <summary>Stop allowing NamespaceNotFound errors during startup replication recovery. The oplog replay logic will abort on NamespaceNotFound errors while applying CRUD operations.</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Dec 2018 16:01:02 +0000</created>
                <updated>Tue, 6 Dec 2022 03:10:41 +0000</updated>
                                                                            <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2130700" author="xiangyu.yao" created="Tue, 29 Jan 2019 16:25:20 +0000"  >&lt;p&gt;Taking it out of the project and putting it to the backlog because the condition to selectively relax constraint will be different when the enhancement of two phase drop is done. We should revisit this ticket when we do the enhancement.&lt;/p&gt;</comment>
                            <comment id="2129645" author="xiangyu.yao" created="Mon, 28 Jan 2019 18:57:25 +0000"  >&lt;p&gt;Yes you are right.&lt;/p&gt;</comment>
                            <comment id="2129584" author="benety.goh" created="Mon, 28 Jan 2019 18:33:25 +0000"  >&lt;p&gt;Is this also dependent on storage engine support for pending idents and checkpoints?&lt;/p&gt;</comment>
                            <comment id="2127860" author="xiangyu.yao" created="Fri, 25 Jan 2019 17:45:12 +0000"  >&lt;p&gt;We should check FCV to selectively relax this constraint because FCV 4.0 may indicate that dropCollection was done in 4.0-style (rename) so NamespaceNotFound may still be trigger during replication recovery.&lt;/p&gt;</comment>
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