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    <title>MongoDB Jira</title>
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    <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-33336] Snapshot reads should not take MODE_IX locks when autocommit=true</title>
                <link>https://jira.mongodb.org/browse/SERVER-33336</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Following &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33143&quot; title=&quot;Hold MODE_IX locks for readConcern level snapshot reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33143&quot;&gt;&lt;del&gt;SERVER-33143&lt;/del&gt;&lt;/a&gt;, snapshot reads always take MODE_IX locks. However, they should only take MODE_IX locks as part of multi-statement transactions, i.e. when &lt;tt&gt;autocommit&lt;/tt&gt; is false. Snapshot reads with &lt;tt&gt;autocommit=true&lt;/tt&gt; should take MODE_IS locks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="498023">SERVER-33336</key>
            <summary>Snapshot reads should not take MODE_IX locks when autocommit=true</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Feb 2018 20:17:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:41 +0000</updated>
                            <resolved>Fri, 2 Mar 2018 22:26:28 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1821954" author="xgen-internal-githook" created="Fri, 2 Mar 2018 22:25:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33336&quot; title=&quot;Snapshot reads should not take MODE_IX locks when autocommit=true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33336&quot;&gt;&lt;del&gt;SERVER-33336&lt;/del&gt;&lt;/a&gt; Snapshot reads should not take MODE_IX locks when autocommit=true&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b1624b3fb1fe7eaf4554682d02c57abc519db819&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b1624b3fb1fe7eaf4554682d02c57abc519db819&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1817844" author="tess.avitabile" created="Tue, 27 Feb 2018 22:33:32 +0000"  >&lt;p&gt;Actually, I disagree with my above statement. If we are in a multi-statement transaction, we will take IX locks, so we do not need to two-phase lock for shared locks. So it is appropriate to decide to two-phase lock based on the readConcern.&lt;/p&gt;</comment>
                            <comment id="1810531" author="tess.avitabile" created="Tue, 20 Feb 2018 17:49:50 +0000"  >&lt;p&gt;It would also be desirable to decide whether to two-phase lock based on whether we are in a transaction, rather than based on the read concern, as we do &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5436c851b8322a0cb18611be0672f6a76d6e2f38/src/mongo/db/service_entry_point_common.cpp#L636&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="486932">SERVER-32880</issuekey>
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            <issuelink>
            <issuekey id="489518">SERVER-33004</issuekey>
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