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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-59444] Enable lock-free reads with multi-document transactions</title>
                <link>https://jira.mongodb.org/browse/SERVER-59444</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In theory, this should not be too difficult, but would take some work.&lt;/p&gt;

&lt;p&gt;Multi-document transactions save the RecoveryUnit (and thus snapshot) and locks held (LockerImpl) across operations/commands. Lock-free reads store the CollectionCatalog on the opCtx, so any new collections accessed can be from the same point-in-time view of the catalog: we would need to save this for the multi-doc transaction like the RecoveryUnit and LockerImpl is saved today.&lt;/p&gt;

&lt;p&gt;The part I&apos;m unfamiliar with is how storage snapshots are handled in multi-document transactions, whether they can ever be reset. If snapshot resets happen, then that would make it a little trickier to handle a stored CollectionCatalog &amp;#8211; the CollectionCatalog would need refreshing, too, to maintain the same catalog view in-memory and on-disk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1855202">SERVER-59444</key>
            <summary>Enable lock-free reads with multi-document transactions</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="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-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
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                <created>Thu, 19 Aug 2021 15:35:35 +0000</created>
                <updated>Tue, 6 Dec 2022 01:00:12 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4010543" author="JIRAUSER1253424" created="Thu, 19 Aug 2021 18:03:01 +0000"  >&lt;p&gt;We would want to prototype on the project and timebox it in one sprint.&lt;/p&gt;</comment>
                            <comment id="4010542" author="dianna.hohensee" created="Thu, 19 Aug 2021 18:02:41 +0000"  >&lt;p&gt;Note:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;unfamiliar with how snapshots are handled, whether they are released and reacquired.&lt;/li&gt;
	&lt;li&gt;not sure how to handle upgrading to locked if the transaction starts doing writes.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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