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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-44581] Index builds must ensure a storage transaction is active to correctly ignore prepare conflicts</title>
                <link>https://jira.mongodb.org/browse/SERVER-44581</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The collection scan stage of index builds is not guaranteed to perform reads inside of a transaction. This is not normally problematic, because WiredTiger still guarantees snapshot isolation. The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51cb15e996714418004016473ae3ce08c46455e7/src/mongo/db/storage/wiredtiger/wiredtiger_begin_transaction_block.cpp#L55-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;flag to ignore prepare conflicts with &quot;ignore_prepare=true&quot; is set on the call to &quot;begin_transaction&lt;/a&gt;, so If no transaction is open, prepare conflicts will not be ignored.&lt;/p&gt;

&lt;p&gt;The cursor used by the collection scan stage &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51cb15e996714418004016473ae3ce08c46455e7/src/mongo/db/storage/wiredtiger/wiredtiger_cursor.cpp#L48&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;opens a transaction implicitly by a call to getSession()&lt;/a&gt;. The WriteUnitOfWork::commit() &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51cb15e996714418004016473ae3ce08c46455e7/src/mongo/db/catalog/multi_index_block.cpp#L503&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;during index build collection scans&lt;/a&gt; ends the current WT transaction, and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51cb15e996714418004016473ae3ce08c46455e7/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L190&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;inactivates the RecoveryUnit&lt;/a&gt;. Any subsequent cursor operation will use a valid cursor, but not inside of a transaction, and not ignoring prepare conflicts.&lt;/p&gt;</description>
                <environment></environment>
        <key id="999366">SERVER-44581</key>
            <summary>Index builds must ensure a storage transaction is active to correctly ignore prepare conflicts</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Nov 2019 18:14:13 +0000</created>
                <updated>Tue, 6 Dec 2022 02:42:35 +0000</updated>
                            <resolved>Tue, 12 Nov 2019 23:31:24 +0000</resolved>
                                    <version>4.2.0</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
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                    <name>Duplicate</name>
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            <issuekey id="999011">SERVER-44577</issuekey>
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