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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-52727] Handle cloneCollectionAsCapped and convertToCapped during tenant migrations</title>
                <link>https://jira.mongodb.org/browse/SERVER-52727</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/cloneCollectionAsCapped/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cloneCollectionAsCapped&lt;/a&gt; creates a new capped collection and puts the data from an existing collection into it. It generates multiple oplog entries: first an oplog entry to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1e8ea257b835c4d8e130205a2fd8297bcccbd47/src/mongo/db/catalog/capped_utils.cpp#L160&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create the new capped collection&lt;/a&gt;, then&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1e8ea257b835c4d8e130205a2fd8297bcccbd47/src/mongo/db/catalog/capped_utils.cpp#L227&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;individual oplog entries to insert&lt;/a&gt; documents from the existing collection into the new capped collection.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/convertToCapped/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;convertToCapped&lt;/a&gt; uses cloneCollectionAsCapped&apos;s machinery to create a new capped collection and put data from an existing collection into it, then rename the new capped collection over the existing collection. So, it also generates the same oplog entries as cloneCollectionAsCapped, plus an oplog entry for the rename.&lt;/p&gt;

&lt;p&gt;Currently, it&apos;s possible for a tenant migration to start blocking after cloneCollectionAsCapped or convertToCapped have written only some of their oplog entries. The operations will fail but leave the capped collection around as garbage on the donor, and the recipient will have the capped collection as garbage as well.&lt;/p&gt;

&lt;p&gt;I think it&apos;s also possible for this garbage to be created if a stepdown happens during cloneCollectionAsCapped or convertToCapped today.&lt;br/&gt;
&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1537502">SERVER-52727</key>
            <summary>Handle cloneCollectionAsCapped and convertToCapped during tenant migrations</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="jason.zhang@mongodb.com">Jason Zhang</reporter>
                        <labels>
                            <label>pm-1791_milestone-A</label>
                    </labels>
                <created>Mon, 9 Nov 2020 21:43:56 +0000</created>
                <updated>Mon, 5 Dec 2022 23:00:13 +0000</updated>
                            <resolved>Tue, 17 Nov 2020 02:51:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4991368" author="xgen-internal-githook" created="Thu, 17 Nov 2022 21:42:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52981&quot; title=&quot;Complete TODO listed in SERVER-52727&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52981&quot;&gt;&lt;del&gt;SERVER-52981&lt;/del&gt;&lt;/a&gt; Complete TODO listed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52727&quot; title=&quot;Handle cloneCollectionAsCapped and convertToCapped during tenant migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52727&quot;&gt;&lt;del&gt;SERVER-52727&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a436845349b9d52bb54febf03614f540250202a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a436845349b9d52bb54febf03614f540250202a4&lt;/a&gt;&lt;/p&gt;</comment>
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