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    <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-56733] Index builds must set the PrepareConflictBehavior::kIgnoreConflictsAllowWrites flag on the RecoveryUnit on resume in the drain phase</title>
                <link>https://jira.mongodb.org/browse/SERVER-56733</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A resumed index build goes through this &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480/src/mongo/db/index_builds_coordinator.cpp#L2183&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if-else-if statement&lt;/a&gt; in the index build code wherein &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480/src/mongo/db/index_builds_coordinator.cpp#L2375-L2376&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mutual setup code sets the &lt;tt&gt;PrepareConflictBehavior::kIgnoreConflictsAllowWrites&lt;/tt&gt; flag on the &lt;tt&gt;RecoveryUnit&lt;/tt&gt;&lt;/a&gt;. Setting that flag avoids a possible &lt;a href=&quot;https://github.com/mongodb/mongo/blob/635f61f317fd88b840588f68d0f38211fc5cabcb/src/mongo/db/storage/wiredtiger/wiredtiger_prepare_conflict.h#L87&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; check that the index build thread is killable (to avoid prepare conflict deadlocks).&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480/src/mongo/db/resumable_index_builds.idl#L51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drain phase&lt;/a&gt; does not execute the if-else-if code, it is the undefined else situation. For that else situation (drain phase) we still need to set the &lt;tt&gt;PrepareConflictBehavior::kIgnoreConflictsAllowWrites&lt;/tt&gt; flag on the &lt;tt&gt;RecoveryUnit&lt;/tt&gt;. I recommend pulling the mutual code up, so it&apos;s more clear that the flag is set and more difficult to accidentally forget.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1705545">SERVER-56733</key>
            <summary>Index builds must set the PrepareConflictBehavior::kIgnoreConflictsAllowWrites flag on the RecoveryUnit on resume in the drain phase</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 May 2021 21:07:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:55 +0000</updated>
                            <resolved>Wed, 12 May 2021 01:31:52 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3768095" author="xgen-internal-githook" created="Wed, 12 May 2021 00:37:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56733&quot; title=&quot;Index builds must set the PrepareConflictBehavior::kIgnoreConflictsAllowWrites flag on the RecoveryUnit on resume in the drain phase&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56733&quot;&gt;&lt;del&gt;SERVER-56733&lt;/del&gt;&lt;/a&gt; Index builds must set the PrepareConflictBehavior::kIgnoreConflictsAllowWrites flag on the RecoveryUnit on resume in the drain phase&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/100811c3e5cc533c922e23ede0e5935eabc5da0c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/100811c3e5cc533c922e23ede0e5935eabc5da0c&lt;/a&gt;&lt;/p&gt;</comment>
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