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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-38603] KV Storage Engine should defer removing idents by registering the ident with the KVDropPendingIdentReaper</title>
                <link>https://jira.mongodb.org/browse/SERVER-38603</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In DatabaseImpl::dropCollectionEvenIfSystem(),  we currently rename the collection to a &amp;lt;db&amp;gt;.system.drop.* namespace. With drop-pending ident support, we will instead invoke _finishDropCollection() to remove the collection from the catalog.&lt;/p&gt;

&lt;p&gt;Subsequently, the KV storage engine will remove the collection from the KVCatalog. Rather than dropping the ident, the KVDatabaseCatalogEntryBase::RemoveCollectionChange will register the ident with the KVDropPendingIdentReaper using the commit timestamp from the RecoveryUnit.&lt;/p&gt;

&lt;p&gt;With the new Timestamp notifier introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38128&quot; title=&quot;Create a periodic task associated with the KV engine to notify listeners of stable/oldest/checkpointed timestamp changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38128&quot;&gt;&lt;del&gt;SERVER-38128&lt;/del&gt;&lt;/a&gt;, it is now possible for the KVStorageEngine to set up a listener for changes to either the oldest or checkpoint timestamps together with a KVDropPendingIdentReaper so that drop-pending idents with commit timestamps that precede the oldest timestamp can be safely removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="653006">SERVER-38603</key>
            <summary>KV Storage Engine should defer removing idents by registering the ident with the KVDropPendingIdentReaper</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Dec 2018 15:56:02 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:45 +0000</updated>
                            <resolved>Sun, 23 Dec 2018 11:54:11 +0000</resolved>
                                                    <fixVersion>4.1.7</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2099374" author="xgen-internal-githook" created="Sun, 23 Dec 2018 11:52:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38603&quot; title=&quot;KV Storage Engine should defer removing idents by registering the ident with the KVDropPendingIdentReaper&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38603&quot;&gt;&lt;del&gt;SERVER-38603&lt;/del&gt;&lt;/a&gt; dropping a collection removes catalog entry immediately and defers ident drop&lt;/p&gt;

&lt;p&gt;If drop-pending idents are supported by the storage engine, this disables the replication&lt;br/&gt;
layer system.drop.* namespaces in favor of having the storage engine manage the removal of&lt;br/&gt;
the idents from disk.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ee875286545864f80bcfcfa31936f83778c699e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ee875286545864f80bcfcfa31936f83778c699e0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2099278" author="xgen-internal-githook" created="Sat, 22 Dec 2018 23:37:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38603&quot; title=&quot;KV Storage Engine should defer removing idents by registering the ident with the KVDropPendingIdentReaper&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38603&quot;&gt;&lt;del&gt;SERVER-38603&lt;/del&gt;&lt;/a&gt; remove unused boolean field from add/remove collection handlers.hbdefg&lt;/p&gt;

&lt;p&gt;These fields are always set to true. The code that used to set these fields to false&lt;br/&gt;
was removed in commit 2cdc2a96e1c8779658fe0eab459dcc38cf01c54d.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8195b17e78a2f0617289e1d8f3b318e1f2c8f077&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8195b17e78a2f0617289e1d8f3b318e1f2c8f077&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2099266" author="xgen-internal-githook" created="Sat, 22 Dec 2018 22:08:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38603&quot; title=&quot;KV Storage Engine should defer removing idents by registering the ident with the KVDropPendingIdentReaper&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38603&quot;&gt;&lt;del&gt;SERVER-38603&lt;/del&gt;&lt;/a&gt; add KVStorageEngineInterface.hbdefg&lt;/p&gt;

&lt;p&gt;This helps to break the curcular dependency between KVDatabaseCatalogEntryBase&lt;br/&gt;
and KVStorageEngine.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c7124bb488ac67ed53db7e827d6da34242305b55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c7124bb488ac67ed53db7e827d6da34242305b55&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2099199" author="xgen-internal-githook" created="Sat, 22 Dec 2018 12:19:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38603&quot; title=&quot;KV Storage Engine should defer removing idents by registering the ident with the KVDropPendingIdentReaper&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38603&quot;&gt;&lt;del&gt;SERVER-38603&lt;/del&gt;&lt;/a&gt; KVStorageEngine removes drop-pending idents when the oldest timestamp advances.hdbefg&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/402ea2b4d8e616878c2e14a5fb6f2f86faaaada0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/402ea2b4d8e616878c2e14a5fb6f2f86faaaada0&lt;/a&gt;&lt;/p&gt;</comment>
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