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    <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-35127] dropDatabase oplog entries can commit collection drops with a timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-35127</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Collection drops happen in two writes. The first write renames the collection to a &quot;drop pending&quot; namespace. This write must be timestamped with the optime of the collection drop. The second write is to remove the collection from the catalog. This write must happen after the rename has become majority committed. This write that removes from the catalog must not be timestamped[1].&lt;/p&gt;

&lt;p&gt;Commands being processed via oplog application &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ab1592260c9b21d802aa65a11d268c0a97b11a7/src/mongo/db/repl/oplog.cpp#L1594-L1595&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use a timestamp block&lt;/a&gt; that sets a timestamp &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ab1592260c9b21d802aa65a11d268c0a97b11a7/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L257-L261&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;at commit time&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;[1] KVStorageEngine::dropDatabase has a mechanism to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ab1592260c9b21d802aa65a11d268c0a97b11a7/src/mongo/db/storage/kv/kv_storage_engine.cpp#L451-L472&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;disable this timestamp for non-replicated collections&lt;/a&gt;, but not for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ab1592260c9b21d802aa65a11d268c0a97b11a7/src/mongo/db/storage/kv/kv_storage_engine.cpp#L490&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replicated collections&lt;/a&gt;. This was introduced back when it was a goal to appropriately timestamp collection drops. However, table drops are not transactional, which means dropped tables do not come back after a crash, even if the last checkpoint was taken before the table was dropped. If the write that removes a collection from the catalog is timestamped, there&apos;s a possibility that this write will not become &quot;stable&quot; when performing clean shutdown. Because the table is already dropped, the data files on disk would be inconsistent; a collection will exist without its backing table.&lt;/p&gt;</description>
                <environment></environment>
        <key id="547182">SERVER-35127</key>
            <summary>dropDatabase oplog entries can commit collection drops with a timestamp</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>
                    </labels>
                <created>Mon, 21 May 2018 17:34:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:36 +0000</updated>
                            <resolved>Wed, 23 May 2018 14:19:27 +0000</resolved>
                                                    <fixVersion>4.0.0-rc1</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1899489" author="xgen-internal-githook" created="Wed, 23 May 2018 14:24:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35127&quot; title=&quot;dropDatabase oplog entries can commit collection drops with a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35127&quot;&gt;&lt;del&gt;SERVER-35127&lt;/del&gt;&lt;/a&gt;: Do not timestamp any collection drops committed by dropDatabase.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7730b27795b642ac772411cfba25f165ddb265e7)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/04a684897ae63c60d7e52acf432d03cc341757f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/04a684897ae63c60d7e52acf432d03cc341757f6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1899478" author="xgen-internal-githook" created="Wed, 23 May 2018 14:19:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35127&quot; title=&quot;dropDatabase oplog entries can commit collection drops with a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35127&quot;&gt;&lt;del&gt;SERVER-35127&lt;/del&gt;&lt;/a&gt;: Do not timestamp any collection drops committed by dropDatabase.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7730b27795b642ac772411cfba25f165ddb265e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7730b27795b642ac772411cfba25f165ddb265e7&lt;/a&gt;&lt;/p&gt;</comment>
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