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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-85372] Make cloneCollectionAsCapped and convertToCapped work properly in case of concurrent DDLs</title>
                <link>https://jira.mongodb.org/browse/SERVER-85372</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;cloneCollectionAsCapped&lt;/tt&gt; and &lt;tt&gt;convertToCapped&lt;/tt&gt; commands are currently only exposed by replica sets (or shards) and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84091&quot; title=&quot;cloneCollectionAsCapped command stops working after a replica set is bootstrapped as a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84091&quot;&gt;&lt;del&gt;SERVER-84091&lt;/del&gt;&lt;/a&gt;/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84482&quot; title=&quot;convertToCapped and cloneCollectionAsCapped commands should support unsplittable tracked collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84482&quot;&gt;SERVER-84482&lt;/a&gt; are going to make them available on the router starting from v7.3. The implementation under those tickets will simply forward the request from the router to the primary shard for the targeted db.&lt;/p&gt;

&lt;p&gt;This is unsafe because both commands do not properly serialize with concurrent DDLs on the same namespace(s) and will be even more unsafe &quot;tomorrow&quot; (once unsharded collections will be tracked) because they are only creating the collection on the local catalog.&lt;/p&gt;

&lt;p&gt;Purpose of this ticket is to fix such limitation starting from v8.0. The new implementation could perform an aggregation to copy the documents and create the new capped collection. More details in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84091?focusedCommentId=6000547&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-6000547&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2549827">SERVER-85372</key>
            <summary>Make cloneCollectionAsCapped and convertToCapped work properly in case of concurrent DDLs</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jan 2024 14:19:12 +0000</created>
                <updated>Tue, 6 Feb 2024 12:43:43 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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            <issuekey id="2550983">SERVER-85435</issuekey>
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