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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-47415] move data structures for tracking active index builds in IndexBuildsCoordinator into separate class</title>
                <link>https://jira.mongodb.org/browse/SERVER-47415</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;IndexBuildsCoordinator currently maintains a list of the active index builds in _allIndexBuilds synchronized using a mutex and a condition variable. Moving the data structures for maintaining this information, along with the many helpers for waiting/checking active index builds, into a separate class (eg. IndexBuildCatalog) may help to reduce the size of the IndexBuildsCoordinator code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1308459">SERVER-47415</key>
            <summary>move data structures for tracking active index builds in IndexBuildsCoordinator into separate class</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="13201">Fixed</resolution>
                                        <assignee username="brian.deleonardis@mongodb.com">Brian DeLeonardis</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 8 Apr 2020 17:20:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:46 +0000</updated>
                            <resolved>Tue, 3 Nov 2020 22:16:54 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3474734" author="xgen-internal-githook" created="Tue, 3 Nov 2020 22:15:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Brian DeLeonardis&apos;, &apos;email&apos;: &apos;brian.deleonardis@mongodb.com&apos;, &apos;username&apos;: &apos;bdeleonardis1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47415&quot; title=&quot;move data structures for tracking active index builds in IndexBuildsCoordinator into separate class&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47415&quot;&gt;&lt;del&gt;SERVER-47415&lt;/del&gt;&lt;/a&gt; Move data structures for tracking active index builds out of IndexBuildsCoordinator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b4c6fc5e2cc368c0efa3ca7252a3fd2cb4f54abd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b4c6fc5e2cc368c0efa3ca7252a3fd2cb4f54abd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3471623" author="brian.deleonardis" created="Mon, 2 Nov 2020 14:50:52 +0000"  >&lt;p&gt;Code review: &lt;a href=&quot;https://mongodbcr.appspot.com/702610001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/702610001/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3437410" author="louis.williams" created="Fri, 9 Oct 2020 17:59:38 +0000"  >&lt;p&gt;I can imagine a member class &lt;tt&gt;ActiveIndexBuilds&lt;/tt&gt; that maintains the existing &lt;tt&gt;_allIndexBuilds&lt;/tt&gt; map and mutex. We can forward all of the &quot;assertIndexBuild&quot; and &quot;awaitIndexBuild&quot; helpers to that class.&lt;/p&gt;

&lt;p&gt;The challenge will be to figure out how to handle this &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0689111a30c28096115540e5d91741a705afd049/src/mongo/db/index_builds_coordinator.cpp#L2031-L2083&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;critical section&lt;/a&gt; where we hold the mutex to serialize registering new index builds.&lt;/p&gt;

&lt;p&gt;Edit: The Collection X lock should protect us in the last case I mentioned.&lt;/p&gt;</comment>
                            <comment id="3031467" author="benety.goh" created="Wed, 8 Apr 2020 17:22:40 +0000"  >&lt;p&gt;This improvement was suggested during the code review for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47252&quot; title=&quot;Remove Collection and Database IndexBuildsTrackers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47252&quot;&gt;&lt;del&gt;SERVER-47252&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="1282607">SERVER-46995</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1300614">SERVER-47252</issuekey>
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