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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-45572] Make IndexBuildsCoordinator an interface</title>
                <link>https://jira.mongodb.org/browse/SERVER-45572</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once the mobile storage engine is removed, we can consolidate the IndexBuildsCoodinator into a real interface with a single implementation. It is currently a very bloated class. We could optionally split the implementations into single-phase and two-phase components.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1090559">SERVER-45572</key>
            <summary>Make IndexBuildsCoordinator an interface</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="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-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>techdebt</label>
                    </labels>
                <created>Tue, 14 Jan 2020 19:50:09 +0000</created>
                <updated>Tue, 6 Dec 2022 02:38:19 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2780692" author="milkie" created="Mon, 3 Feb 2020 17:44:08 +0000"  >&lt;p&gt;Note: the mobile storage engine has now been removed in the master branch.&lt;/p&gt;</comment>
                            <comment id="2771390" author="dianna.hohensee" created="Wed, 29 Jan 2020 20:39:31 +0000"  >&lt;p&gt;The original idea behind the IndexBuildsCoordinator and IndexBuildManager is that the Coordinator would handle cross-replica set relevant index building code while the Manager would deal with all of the server specific index building code. The ReplIndexBuildState was a tool to maintain and facilitate passing around an index build&apos;s state information within the Coordinator.&lt;/p&gt;

&lt;p&gt;Ultimately, I thought it would be nice to stick the IndexBuildsManager behind some kind of storage layer interface, whereas the IndexBuildsCoordinator would live above the storage engine layer, bossing the storage layer around to get the index builds done as the replica set desires.&lt;/p&gt;

&lt;p&gt;I haven&apos;t been following along with the project to understand why we would keep single-phase index builds in future versions.&lt;/p&gt;</comment>
                            <comment id="2725251" author="benety.goh" created="Tue, 14 Jan 2020 20:20:58 +0000"  >&lt;p&gt;The index building logic within &lt;a href=&quot;https://github.com/mongodb/mongo/blob/88aaa47b815507e3ddd9a3a79f00d0eaca3ae071/src/mongo/db/catalog/index_builds_manager.h#L56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;IndexBuildsManager&lt;/a&gt; could also be moved into the ReplIndexBuildState class.&lt;/p&gt;</comment>
                            <comment id="2725240" author="benety.goh" created="Tue, 14 Jan 2020 20:12:43 +0000"  >&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/88aaa47b815507e3ddd9a3a79f00d0eaca3ae071/src/mongo/db/repl_index_build_state.h#L70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ReplIndexBuildState&lt;/a&gt; could be turned into a more active class with the handling of single-phase/two-phase index builds in different subclases.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
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            <issuekey id="880185">SERVER-42513</issuekey>
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            <issuekey id="996542">SERVER-44549</issuekey>
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