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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31650] Change streams do not correctly record diagnostics during initial aggregate command</title>
                <link>https://jira.mongodb.org/browse/SERVER-31650</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When processing a change stream aggregation, the server will acquire locks on the oplog to do its scan. Unfortunately, acquiring locks is also the process we use to record diagnostics like Top and currentOp (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.0-rc0/src/mongo/db/db_raii.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;db_raii.h&lt;/a&gt;). This means that the initial aggregate will be treated as if it was an aggregate on the &apos;local.oplog.rs&apos; collection, using the profiling level of the &apos;local&apos; database, recording a read entry in the &apos;local.oplog.rs&apos; section of the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/top/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;top&lt;/a&gt; output, and using that namespace in the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.currentOp/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;currentOp&lt;/a&gt; output and in the slow query logs.&lt;/p&gt;

&lt;p&gt;We do register the change stream cursor on the user&apos;s requested namespace, so all getMore commands will behave correctly when tracking these metrics.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="448374">SERVER-31650</key>
            <summary>Change streams do not correctly record diagnostics during initial aggregate command</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>change-streams-improvements</label>
                            <label>open_todo_in_code</label>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Thu, 19 Oct 2017 20:37:52 +0000</created>
                <updated>Tue, 6 Dec 2022 03:48:49 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1704705" author="charlie.swanson" created="Fri, 20 Oct 2017 14:20:56 +0000"  >&lt;p&gt;It&apos;s using &lt;tt&gt;AutoGetCollectionOrViewForReadCommand&lt;/tt&gt;, which does the most things automatically. I think the documentation on each is up to date though - you can see which classes do which &apos;auto&apos; things - &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.0-rc0/src/mongo/db/db_raii.h#L253-L255&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.6.0-rc0/src/mongo/db/db_raii.h#L253-L255&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1704367" author="milkie" created="Thu, 19 Oct 2017 22:46:00 +0000"  >&lt;p&gt;Which db_raii object is it using to read?  I believe only some of the constructs in that file trigger a new CurOp, correct?  I want to confirm that my code changes to lock the oplog earlier for vectored insert won&apos;t have the same ill effects as what is described here for agg.&lt;/p&gt;</comment>
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