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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84852] Document work to make agg function with transactions and snapshot reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-84852</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;presumably this will just be a list of SERVER tickets.&lt;/p&gt;</description>
                <environment></environment>
        <key id="482416">SERVER-84852</key>
            <summary>Document work to make agg function with transactions and snapshot reads</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="13201">Fixed</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="ian@mongodb.com">Ian Whalen</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Jan 2018 19:55:45 +0000</created>
                <updated>Fri, 12 Jan 2024 02:51:48 +0000</updated>
                            <resolved>Thu, 1 Mar 2018 17:53:20 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="1820084" author="david.storch" created="Thu, 1 Mar 2018 17:53:20 +0000"  >&lt;p&gt;Closing, as I&apos;ve done the research. Planning to take on the actual implementation work under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33541&quot; title=&quot;Add snapshot read support for aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33541&quot;&gt;&lt;del&gt;SERVER-33541&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1819283" author="david.storch" created="Wed, 28 Feb 2018 23:10:53 +0000"  >&lt;p&gt;I don&apos;t think there&apos;s much work here, but I have a few open questions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Should we make an effort to ban snapshot reads for aggregations that are actually reading metadata sources (as opposed to reading actual user data with DocumentSourceCursor, or DocumentSourceSampleFromRandomCursor)?&lt;/li&gt;
	&lt;li&gt;I think we could end up taking a lot of locks, or taking the same lock recursively many times. In particular $lookup could pose a problem. Any issues we foresee here? I assume we should at least write a test case to make sure this doesn&apos;t completely blow up?&lt;/li&gt;
	&lt;li&gt;In particular, I notice that the locking code will keep a list of resources to unlock when two-phase locking is enabled. Since $lookup normally acquires and drops locks repeatedly, this list could grow quite long. Is this a problem?&lt;/li&gt;
	&lt;li&gt;Anything somehow related to transactions (but not snapshot reads) that I might be missing?&lt;/li&gt;
	&lt;li&gt;Can I go ahead and file a server ticket? I have a patch in progress.&lt;/li&gt;
	&lt;li&gt;Need to ban $out and change streams? And probably geo near? I better audit the agg language to see if there is anything else that will cause trouble. $mergeCursors maybe?&lt;/li&gt;
&lt;/ul&gt;
</comment>
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