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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-43638] Do not block prepared transactions on two-phase index builds on secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-43638</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The&#160;&#160;index_builds_ignore_prepare_conflicts.js test was disabled by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43301&quot; title=&quot;add no_passthrough to two phase index builds evergreen builder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43301&quot;&gt;&lt;del&gt;SERVER-43301&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;To make this test pass, disable the fix put in by&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38588&quot; title=&quot;Hybrid index builds do not work when applied concurrently with prepared transactions on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38588&quot;&gt;&lt;del&gt;SERVER-38588&lt;/del&gt;&lt;/a&gt; to block prepared transactions on index builds on secondaries.&lt;/p&gt;

&lt;p&gt;When two-phase index builds are in use, it is both unnecessary and unsafe to block a prepared transactions on index builds on secondaries. Due to locking,&#160;we can guarantee that a transaction prepared on a primary during an index build will always commit before that index build completes. Because two-phase index builds replicate start and&#160;commit oplog entries, it will never be possible to replicate a prepared transaction, commit&#160;an index build, then commit the transaction, the bug &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38588&quot; title=&quot;Hybrid index builds do not work when applied concurrently with prepared transactions on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38588&quot;&gt;&lt;del&gt;SERVER-38588&lt;/del&gt;&lt;/a&gt; addressed.&lt;/p&gt;

&lt;p&gt;This blocking behavior can also introduce a deadlock with two-phase index builds on&#160;a secondary if a prepared transaction blocks on an index build, but the index build can&apos;t&#160;re-acquire its S or X lock because of the transaction.&lt;/p&gt;</description>
                <environment></environment>
        <key id="940030">SERVER-43638</key>
            <summary>Do not block prepared transactions on two-phase index builds on secondaries</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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, 25 Sep 2019 17:31:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:48 +0000</updated>
                            <resolved>Thu, 10 Oct 2019 13:52:29 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2474554" author="xgen-internal-githook" created="Wed, 9 Oct 2019 19:56:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;louiswilliams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;name&apos;: &apos;Louis Williams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43638&quot; title=&quot;Do not block prepared transactions on two-phase index builds on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43638&quot;&gt;&lt;del&gt;SERVER-43638&lt;/del&gt;&lt;/a&gt; Do not block prepared transactions on index builds on secondaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/906ac3ca78d352df2d0dd45350195251efe0dea1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/906ac3ca78d352df2d0dd45350195251efe0dea1&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="943441">SERVER-43692</issuekey>
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            <issuekey id="652186">SERVER-38588</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="713609">SERVER-40041</issuekey>
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            <issuekey id="924595">SERVER-43301</issuekey>
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