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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-45055] Startup recovery should work with more than one unfinished two-phase index build</title>
                <link>https://jira.mongodb.org/browse/SERVER-45055</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Startup recovery for unfinished index builds first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c00dd36c913feb58d36eaba91609813674584af4/src/mongo/db/index_builds_coordinator.cpp#L371&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drops each index from the durable catalog before restarting the index build&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The recovery procedure then initializes the collection&apos;s in-memory state with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c00dd36c913feb58d36eaba91609813674584af4/src/mongo/db/index_builds_coordinator.cpp#L385&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Collection::init()&lt;/a&gt;. This also initializes the IndexCatalog, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/79af378abece4049e2042cfcfcf2275aff7c3fb8/src/mongo/db/catalog/index_catalog_impl.cpp#L104&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariants that all indexes in the durable catalog are ready&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If there is more than one unfinished index build, separate calls will be made to initialize the IndexCatalog for each build. The first call will fail on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/79af378abece4049e2042cfcfcf2275aff7c3fb8/src/mongo/db/catalog/index_catalog_impl.cpp#L104&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt;, because the second index has not been dropped yet.&lt;/p&gt;

&lt;p&gt;Fixing this is tricky, because both the Collection and IndexCatalog can only be initialized once, and index builds need to be started in separate threads. Additionally, dropping and recreating indexes need to be part of the same storage transaction.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1048023">SERVER-45055</key>
            <summary>Startup recovery should work with more than one unfinished two-phase index build</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Dec 2019 13:48:19 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:14 +0000</updated>
                            <resolved>Thu, 26 Mar 2020 19:55:56 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3023940" author="xgen-internal-githook" created="Thu, 2 Apr 2020 19:46:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45055&quot; title=&quot;Startup recovery should work with more than one unfinished two-phase index build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45055&quot;&gt;&lt;del&gt;SERVER-45055&lt;/del&gt;&lt;/a&gt; Startup recovery should work with more than one unfinished two-phase index build&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c2f9ac87298c390a4557876a6b2a6f9b836a7efd)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/717c79bf6031ceee5594e68b416c7874bfc6f5e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/717c79bf6031ceee5594e68b416c7874bfc6f5e2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3002772" author="xgen-internal-githook" created="Thu, 26 Mar 2020 17:19:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;name&apos;: &apos;Louis Williams&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45055&quot; title=&quot;Startup recovery should work with more than one unfinished two-phase index build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45055&quot;&gt;&lt;del&gt;SERVER-45055&lt;/del&gt;&lt;/a&gt; Startup recovery should work with more than one unfinished two-phase index build&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c2f9ac87298c390a4557876a6b2a6f9b836a7efd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c2f9ac87298c390a4557876a6b2a6f9b836a7efd&lt;/a&gt;&lt;/p&gt;</comment>
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