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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-29261] test performance of initial sync when doing _id index scan vs $natural collection scan</title>
                <link>https://jira.mongodb.org/browse/SERVER-29261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="384509">SERVER-29261</key>
            <summary>test performance of initial sync when doing _id index scan vs $natural collection scan</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 May 2017 20:22:48 +0000</created>
                <updated>Tue, 6 Dec 2022 04:00:50 +0000</updated>
                            <resolved>Tue, 10 Apr 2018 15:48:58 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1579047" author="judah.schvimer" created="Wed, 24 May 2017 16:11:34 +0000"  >&lt;p&gt;Further testing did not show any regressions. We will attempt this test again once PERF-943 is resolved.&lt;/p&gt;</comment>
                            <comment id="1576604" author="judah.schvimer" created="Mon, 22 May 2017 14:37:50 +0000"  >&lt;p&gt;The first patch above showed no significant regressions, though also the LogKeeper test was broken, and one of the workload phases was broken. The normal initial sync workload is likely not a good indicator of this performance change, since the database can keep all of the data in memory and using an _id sort will have the largest impact when data is not in memory. &lt;/p&gt;

&lt;p&gt;I&apos;m rerunning the patch here with some of the workload bugs fixed: &lt;a href=&quot;https://evergreen.mongodb.com/version/5922f74a2fbabe1b4d000242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/version/5922f74a2fbabe1b4d000242&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1573861" author="judah.schvimer" created="Wed, 17 May 2017 20:30:28 +0000"  >&lt;p&gt;I have run the following patch adding a &quot;sort: {_id: 1}&quot; to the collection cloner&apos;s find command:&lt;br/&gt;
&lt;a href=&quot;https://evergreen.mongodb.com/version/591cb28f2fbabe24b50032bf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/version/591cb28f2fbabe24b50032bf&lt;/a&gt;&lt;/p&gt;</comment>
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