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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-71269] Use compact diff format for updates to arrays using classic $set, $pop, $pull</title>
                <link>https://jira.mongodb.org/browse/SERVER-71269</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using classic update language with operators $set, $pop, $pull to add/remove an element from the array, it writes down the new value of the array to the oplog, and leads to large change stream events.&lt;/p&gt;

&lt;p&gt;Instead we could use compact diff so that the resulting change stream event would include:&lt;/p&gt;

&lt;p&gt;{&#160;&lt;tt&gt;updateDescription: {&#160;&lt;/tt&gt;&lt;tt&gt;updatedFields: { &apos;arrayField.3&apos;: 4 &#160;},&lt;/tt&gt;&lt;tt&gt;&#160;...&#160;&lt;/tt&gt;&lt;tt&gt;&#160;&lt;/tt&gt;}}&lt;/p&gt;

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

&lt;p&gt;{{{ updateDescription: {..., truncatedArrays: [ { field: &apos;&lt;tt&gt;arrayField&lt;/tt&gt;&apos;, newSize: 3 } ]&#160;} }&#160;}}&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2181396">SERVER-71269</key>
            <summary>Use compact diff format for updates to arrays using classic $set, $pop, $pull</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-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="kateryna.kamenieva@mongodb.com">Katya Kamenieva</reporter>
                        <labels>
                            <label>ians-backlog</label>
                    </labels>
                <created>Thu, 10 Nov 2022 22:23:09 +0000</created>
                <updated>Fri, 6 Oct 2023 16:48:44 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5118584" author="kateryna.kamenieva" created="Tue, 17 Jan 2023 19:00:00 +0000"  >&lt;p&gt;I filed a separate ticket for $addToSet &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72941&quot; title=&quot;Use compact diff format for updates to arrays using classic $addToSet operator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72941&quot;&gt;&lt;del&gt;SERVER-72941&lt;/del&gt;&lt;/a&gt;, as it seems like the most feasible sub-task from this bucket. For the rest of the operators, the work is pretty substantial, and there is no strong-enough reason today to invest in this effort.&lt;/p&gt;</comment>
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                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2184658">SERVER-71331</issuekey>
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                                        <issuelink>
            <issuekey id="2462787">DOCS-16424</issuekey>
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            <issuekey id="2235234">SERVER-72941</issuekey>
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