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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-74581] Ensure AsyncRequestMerger is constructed with valid TaskExecutor</title>
                <link>https://jira.mongodb.org/browse/SERVER-74581</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When populating DocumentSourceMergeCursors &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5cf085e4df719eb8122be5d171795b0ee3202bdc/src/mongo/s/query/document_source_merge_cursors.cpp#L89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we extract the TaskExecutor from the MongoProcessInterface of the given epression context&lt;/a&gt;. This is not always safe because the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3489953893de85fa30c70e56cac65ffff5000ae/src/mongo/db/pipeline/expression_context.cpp#L143&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoProcessInterface could be built with a null executor&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In case a null executor is used the underlying BlockingResultsMerger will through a Segfault on first execution of getNext, that is difficult to debug.&lt;/p&gt;

&lt;p&gt;In order to ease the debug process and early detect those programming errors I would suggest to use invariants to ensure the TaskExecutor is valid when populating the DocumentSourceMergeCursor stage.&lt;/p&gt;


&lt;p&gt;Additionally we should ask similar invariant &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3489953893de85fa30c70e56cac65ffff5000ae/src/mongo/s/query/async_results_merger.cpp#LL106C8-L106C16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in the constructor of AsyncResultsMerger&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2280427">SERVER-74581</key>
            <summary>Ensure AsyncRequestMerger is constructed with valid TaskExecutor</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
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                            <label>car-qw</label>
                            <label>neweng</label>
                            <label>sharding-wfbf-day</label>
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                <created>Fri, 3 Mar 2023 08:41:02 +0000</created>
                <updated>Fri, 27 Oct 2023 15:46:43 +0000</updated>
                            <resolved>Fri, 27 Oct 2023 15:46:43 +0000</resolved>
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