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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-69677] Add warning to index build unexpected error code invariant and only enable in debug builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-69677</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Unexpected error code during index build shutdown &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e3336795ba88f7fd4cea05c917f710bb753def9a/src/mongo/db/index_builds_coordinator.cpp#L2398-L2400&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; is the symptom of many server crashes and problems.&lt;/p&gt;

&lt;p&gt;Its existence points to a design flaw of two-phase simultanous index builds. However, adding more exemptions to this invariant is also incorrect and should point to a bug.&lt;/p&gt;

&lt;p&gt;Add a warning above this invariant explaining why it is a bad idea to add new exemptions and how to work around this invariant failing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2136045">SERVER-69677</key>
            <summary>Add warning to index build unexpected error code invariant and only enable in debug builds</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Sep 2022 09:49:03 +0000</created>
                <updated>Sun, 29 Oct 2023 21:33:18 +0000</updated>
                            <resolved>Mon, 19 Sep 2022 10:43:32 +0000</resolved>
                                                    <fixVersion>6.1.0-rc3</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4832662" author="xgen-internal-githook" created="Fri, 16 Sep 2022 08:32:10 +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-69677&quot; title=&quot;Add warning to index build unexpected error code invariant and only enable in debug builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69677&quot;&gt;&lt;del&gt;SERVER-69677&lt;/del&gt;&lt;/a&gt; Make &quot;unexpected error code during index build cleanup&quot; a test-only assertion&lt;/p&gt;

&lt;p&gt;Outside of testing, we no longer fail with an invariant, but log a warning.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6680df6423c05f59d20f5eee3e0e8cfcecaaefeb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6680df6423c05f59d20f5eee3e0e8cfcecaaefeb&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1282330">SERVER-46989</issuekey>
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            <issuekey id="1318276">SERVER-47605</issuekey>
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                            <customfieldvalue>The &amp;quot;Unexpected error code during index build cleanup&amp;quot; invariant failure is now only a warning and will not result in the server crashing. Despite this, there is still a small chance that the server crashes with a different fatal assertion (code 51105) in rare circumstances: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/42b3face6dc7662f8ffe08c7cc11d8610e4e7a26/src/mongo/db/index_builds_coordinator.cpp#L2287-L2289&quot;&gt;https://github.com/mongodb/mongo/blob/42b3face6dc7662f8ffe08c7cc11d8610e4e7a26/src/mongo/db/index_builds_coordinator.cpp#L2287-L2289&lt;/a&gt;&lt;br/&gt;
&lt;br/&gt;
There may not be any downstream changes needed, but I wanted to flag this because the failure mode of unexpected index builds errors may change slightly. </customfieldvalue>

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