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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-83056] Confirm $lookup local read optimization doesn&apos;t miss data, migrated during the read</title>
                <link>https://jira.mongodb.org/browse/SERVER-83056</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When $lookup targets only local shard for sub-pipeline, it performs local reads.&lt;/p&gt;

&lt;p&gt;However, if the targeted collection was already read by the same query, it is possible that some storage snapshots are left inside OperationContext, Transaction, etc. that will prevent the query from reading the latest data.&lt;/p&gt;

&lt;p&gt;We need to make sure that there is no discrepancy between routing info that we use and the data that we read.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2495447">SERVER-83056</key>
            <summary>Confirm $lookup local read optimization doesn&apos;t miss data, migrated during the read</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="9">Done</resolution>
                                        <assignee username="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Nov 2023 15:14:34 +0000</created>
                <updated>Wed, 15 Nov 2023 09:01:17 +0000</updated>
                            <resolved>Wed, 15 Nov 2023 08:59:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5881306" author="JIRAUSER1270969" created="Wed, 15 Nov 2023 09:01:17 +0000"  >&lt;p&gt;Tests that were used to check this won&apos;t be committed, as they are very specific and also required some hacky failpoints inside mongod that I don&apos;t think belong in master branch.&lt;/p&gt;</comment>
                            <comment id="5881264" author="JIRAUSER1270969" created="Wed, 15 Nov 2023 08:29:26 +0000"  >&lt;p&gt;If data is migrated during $lookup, it successfully uses up-to-date routing information.&lt;/p&gt;

&lt;p&gt;If we set snapshot read concern, it is respected, and we target the shard that owned the data at specific cluster time.&lt;/p&gt;

&lt;p&gt;If we are inside a transaction, $lookup into sharded collection is not allowed.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;There are some issues with unsplittable collections, but they don&apos;t affect 7.2 release, so I am going to close this ticket and work on them in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83220&quot; title=&quot;Lookup between unsplittable collections gets incorrectly pushed down to SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83220&quot;&gt;&lt;del&gt;SERVER-83220&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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