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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-84146] Save/Restore of checkpoint should account for duplicated documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-84146</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider a pipeline with a `hoppingWindow`, like this one:&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;Say there are 200 open windows. Now, an document will be absorbed into all these open windows. And, though the logical state size is O(200docs), the actual memory usage will still just be 1 doc since documents are cheaply copyable via ref-counting etc&lt;/p&gt;

&lt;p&gt;Now, when such a state is checkpointed and recovered, we lose this sharing info and so today we will end up with 200 different docs after the recovery.&lt;/p&gt;

&lt;p&gt;This causes ballooning in memory usage after the checkpoint has been recovered.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2523899">SERVER-84146</key>
            <summary>Save/Restore of checkpoint should account for duplicated documents</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="12452" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Scheduling</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-atlas-streams@mongodb.com">Backlog - Atlas Streams</assignee>
                                    <reporter username="mayuresh.kulkarni@mongodb.com">Mayuresh Kulkarni</reporter>
                        <labels>
                            <label>init-337-ga</label>
                    </labels>
                <created>Wed, 13 Dec 2023 16:33:59 +0000</created>
                <updated>Tue, 6 Feb 2024 20:51:18 +0000</updated>
                                                                                                <votes>0</votes>
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