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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-33535] Add microbenchmark tests for mixed entries (old and new) in new unique index</title>
                <link>https://jira.mongodb.org/browse/SERVER-33535</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32755&quot; title=&quot;Expand Evergreen microbenchmark coverage for unique index format change&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32755&quot;&gt;&lt;del&gt;SERVER-32755&lt;/del&gt;&lt;/a&gt; identified several microbenchmarks that will be helpful in monitoring (new) unique index performance.&lt;/p&gt;

&lt;p&gt;The new unique index can have old styled entries after an upgrade and any new entries will be made in the new style. Hence with an upgrade mixed entries will be a common scenario. It will be worthwhile adding microbenchmarks for this mode after the new index switches from gating variable to FCV.&lt;/p&gt;</description>
                <environment></environment>
        <key id="503333">SERVER-33535</key>
            <summary>Add microbenchmark tests for mixed entries (old and new) in new unique index</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="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="sulabh.mahajan@mongodb.com">Sulabh Mahajan</assignee>
                                    <reporter username="sulabh.mahajan@mongodb.com">Sulabh Mahajan</reporter>
                        <labels>
                            <label>nonnyc</label>
                            <label>storage-engines</label>
                    </labels>
                <created>Wed, 28 Feb 2018 03:00:08 +0000</created>
                <updated>Wed, 1 Aug 2018 05:55:35 +0000</updated>
                            <resolved>Wed, 1 Aug 2018 05:55:35 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1962375" author="sulabh.mahajan" created="Wed, 1 Aug 2018 05:55:02 +0000"  >&lt;p&gt;I discussed this task with the team and we have decided not to add this test to microbenchmarks. After going over the implementation of the new unique index, it appears that the logic that takes into account whether or not we have mixed entries is the same as for the pure new index. With that understanding we do not see any benefit of adding tests for the mixed entries.&lt;/p&gt;

&lt;p&gt;I am closing this ticket.&lt;/p&gt;</comment>
                            <comment id="1884731" author="david.daly" created="Mon, 7 May 2018 16:04:17 +0000"  >&lt;p&gt;If you could describe it in javascript, we should be able to do it in microbenchmarks, although we would want to be careful about impact on subsequent tests. There are pre and post hooks available in mongo-perf. For example, see &lt;a href=&quot;https://github.com/mongodb/mongo-perf/blob/64c39e5b1039bc863e73aaca70e13efc0e483fa4/testcases/simple_query.js#L135-L139&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&#160;&lt;/p&gt;</comment>
                            <comment id="1884250" author="alexander.gorrod" created="Mon, 7 May 2018 02:16:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt;&#160;or &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.daly&quot; class=&quot;user-hover&quot; rel=&quot;david.daly&quot;&gt;david.daly&lt;/a&gt; Could you let us know if there is existing infrastructure that would allow us to run the microbenchmarks on an index that has content created with both old and new format entries? It would probably require an FCV upgrade during the populate or a multi-phase populate using different versions.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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            <issuekey id="527353">SERVER-34489</issuekey>
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