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    <link>https://jira.mongodb.org</link>
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    <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-33496] Remove timestamping from second phase of collection drops</title>
                <link>https://jira.mongodb.org/browse/SERVER-33496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Collection drops happen in two-steps:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Rename the collection to special name that encodes the optime of the drop. This phase is replicated.&lt;/li&gt;
	&lt;li&gt;When the optime becomes majority committed, asynchronously notify the storage engine the collection can be removed.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;This process gives a guarantee that the storage engine can safely throw away collection without fear of needing to get it back later.&lt;/p&gt;

&lt;p&gt;Because the collection drop is &quot;behind the replica set commit point&quot; and we currently only plan to allow reads at the commit point, it is safe to not timestamp the write that removes the key/value pair from the storage engine&apos;s catalog. Doing so would be convenient to eliminate the risk of assigning a stale ghost timestamp.&lt;/p&gt;

&lt;p&gt;Timestamps for this drop can be assigned in two code paths:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;When the reaper processes the final step of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c4e444a62c/src/mongo/db/repl/storage_interface_impl.cpp#L433-L436&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dropping a collection&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;When &lt;tt&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c4e444a62c/src/mongo/db/storage/kv/kv_storage_engine.cpp#L409-L413&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;`KVStorageEngine::dropDatabase`&lt;/a&gt;&lt;/tt&gt; drops the remaining collections that the reaper has yet to get to.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The latter is the more substantial change, particularly to the documentation. &lt;/p&gt;</description>
                <environment></environment>
        <key id="502575">SERVER-33496</key>
            <summary>Remove timestamping from second phase of collection drops</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>
                            <label>rollback-functional</label>
                    </labels>
                <created>Mon, 26 Feb 2018 18:40:38 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:26 +0000</updated>
                            <resolved>Thu, 1 Mar 2018 02:02:20 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1819165" author="xgen-internal-githook" created="Wed, 28 Feb 2018 21:40:18 +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-33496&quot; title=&quot;Remove timestamping from second phase of collection drops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33496&quot;&gt;&lt;del&gt;SERVER-33496&lt;/del&gt;&lt;/a&gt;: Stop timestamping collection drops.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f8378ed44f4502cde21f3416772d93434e48255&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f8378ed44f4502cde21f3416772d93434e48255&lt;/a&gt;&lt;/p&gt;</comment>
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