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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-28189] Update with $set of many array elements can be super slow to apply</title>
                <link>https://jira.mongodb.org/browse/SERVER-28189</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;See attached repro.  I ran VTune on it and it seems to be 50% in FieldRefSet::insert and 50% in pathsupport::findLongestPrefix; see attached screenshot for details.&lt;/p&gt;</description>
                <environment></environment>
        <key id="361028">SERVER-28189</key>
            <summary>Update with $set of many array elements can be super slow to apply</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Mar 2017 21:19:45 +0000</created>
                <updated>Tue, 6 Dec 2022 04:06:02 +0000</updated>
                            <resolved>Mon, 6 Mar 2017 15:42:13 +0000</resolved>
                                    <version>3.5.3</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1516689" author="david.storch" created="Mon, 6 Mar 2017 15:41:54 +0000"  >&lt;p&gt;We have already identified that conflict detection is a performance problem while updating large documents. I&apos;m marking this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26948&quot; title=&quot;Update conflict detection should be optimized for big documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26948&quot;&gt;&lt;del&gt;SERVER-26948&lt;/del&gt;&lt;/a&gt;. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, if there is something that distinguishes this report from the older ticket, please re-open.&lt;/p&gt;</comment>
                            <comment id="1515817" author="milkie" created="Fri, 3 Mar 2017 21:28:10 +0000"  >&lt;p&gt;Running this repro on my desktop takes approximately 50 seconds.   This is significant because it means that a replica set secondary would be locked for that period of time &amp;#8211; all reads are blocked, and replication is also stalled until this op finishes applying.&lt;/p&gt;</comment>
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                            <attachment id="150748" name="Screenshot_20170303_161455.png" size="107090" author="milkie@mongodb.com" created="Fri, 3 Mar 2017 21:21:46 +0000"/>
                            <attachment id="150751" name="o.js" size="2739729" author="milkie@mongodb.com" created="Fri, 3 Mar 2017 21:30:06 +0000"/>
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