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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-34308] Transactions on secondaries should take IS locks instead of IX</title>
                <link>https://jira.mongodb.org/browse/SERVER-34308</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Operations in multi-statement transactions &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c04aa22602fd1640758886b9945a987214f08c88/src/mongo/db/db_raii.cpp#L248&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;take IX locks&lt;/a&gt;. This is because if a transaction starts with a read, and we later perform a write, there is no way to upgrade the lock mode. Transactions on secondaries should never include writes (and attempting to write should implicitly abort the transaction), so there is no reason to take IX locks. Moreover, a stashed transaction holding IX locks can block an operation that needs an S lock (such as &lt;tt&gt;listCollections&lt;/tt&gt;), which can block oplog application. Thus it is important that transactions on secondaries do not take IX locks like they do on primaries.&lt;/p&gt;

&lt;p&gt;This work requires that we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c04aa22602fd1640758886b9945a987214f08c88/src/mongo/db/service_entry_point_common.cpp#L692&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use two-phase locking for shared locks&lt;/a&gt; in read-only transactions on secondaries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="521892">SERVER-34308</key>
            <summary>Transactions on secondaries should take IS locks instead of IX</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
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                <created>Wed, 4 Apr 2018 18:29:49 +0000</created>
                <updated>Tue, 6 Dec 2022 03:33:12 +0000</updated>
                            <resolved>Fri, 20 Sep 2019 16:17:23 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2426573" author="ratika.gandhi" created="Fri, 20 Sep 2019 16:17:23 +0000"  >&lt;p&gt;Deferred to when we design the epic.&#160;&lt;/p&gt;</comment>
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