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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-56918] Add create index to DDL FSM workloads</title>
                <link>https://jira.mongodb.org/browse/SERVER-56918</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have 4 type of concurrency tests regarding DDL:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3995cd9e13b8196704c48fd7f98886ced8e835b/jstests/concurrency/fsm_workloads/random_DDL_operations.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Only DDL operations&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3995cd9e13b8196704c48fd7f98886ced8e835b/jstests/concurrency/fsm_workloads/random_DDL_CRUD_operations.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DDL + CRUD operations&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3995cd9e13b8196704c48fd7f98886ced8e835b/jstests/concurrency/fsm_workloads/random_DDL_setFCV_operations.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DDL + FCV&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3995cd9e13b8196704c48fd7f98886ced8e835b/jstests/concurrency/fsm_workloads/random_DDL_CRUD_setFCV_operations.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DDL + CRUD + FCV&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;However, a create index could implicitly create a collection, and this is not being tested anywhere. We should add a create index state to the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3995cd9e13b8196704c48fd7f98886ced8e835b/jstests/concurrency/fsm_workloads/random_DDL_CRUD_operations.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DDL + CRUD&lt;/a&gt; test.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1714691">SERVER-56918</key>
            <summary>Add create index to DDL FSM workloads</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 May 2021 15:22:14 +0000</created>
                <updated>Tue, 6 Dec 2022 01:18:32 +0000</updated>
                            <resolved>Fri, 12 Nov 2021 12:24:33 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4185281" author="connie.chen" created="Fri, 12 Nov 2021 12:24:33 +0000"  >&lt;p&gt;After inspecting the code, we realized that the code coverage will not increase materially.&lt;/p&gt;</comment>
                            <comment id="4071611" author="marcos.grillo" created="Mon, 20 Sep 2021 15:19:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; the createIndexes path uses &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc7f0f2f730fdb114657242190fac7a9cfc33fb2/src/mongo/db/commands/create_indexes.cpp#L320&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a slightly different library&lt;/a&gt; than &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc7f0f2f730fdb114657242190fac7a9cfc33fb2/src/mongo/db/ops/write_ops_exec.cpp#L244&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the write path&lt;/a&gt;, although, in the end, the same function &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc7f0f2f730fdb114657242190fac7a9cfc33fb2/src/mongo/db/catalog/database_impl.h#L74&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is being called&lt;/a&gt;. I would say, by adding the createIndex command to the FSM tests, we would increase code coverage.&lt;/p&gt;</comment>
                            <comment id="4068155" author="kaloian.manassiev" created="Fri, 17 Sep 2021 12:55:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=marcos.grillo&quot; class=&quot;user-hover&quot; rel=&quot;marcos.grillo&quot;&gt;marcos.grillo&lt;/a&gt;, is there something special about &lt;tt&gt;createIndex&lt;/tt&gt; which makes it any different than implicit collection creation due to insert in a non-existent collection?&lt;/p&gt;</comment>
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