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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-33143] Hold MODE_IX locks for readConcern level snapshot reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-33143</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MODE_IX locks are required for reads performed as part of multi-statement transactions. Add MODE_IX locking for all snapshot reads to accommodate.&lt;/p&gt;

&lt;p&gt;We will later refine single-statement snapshot reads to use 2-phase MODE_IS locks under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33004&quot; title=&quot;Add two-phase locking for snapshot reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33004&quot;&gt;&lt;del&gt;SERVER-33004&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="493222">SERVER-33143</key>
            <summary>Hold MODE_IX locks for readConcern level snapshot reads</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="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Feb 2018 16:07:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:35:04 +0000</updated>
                            <resolved>Mon, 12 Feb 2018 20:24:33 +0000</resolved>
                                                    <fixVersion>3.7.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1803362" author="xgen-internal-githook" created="Mon, 12 Feb 2018 20:22:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;name&apos;: &apos;James Wahlin&apos;, &apos;username&apos;: &apos;jameswahlin&apos;}
&lt;p&gt;Message: &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; Hold MODE_IX locks for readConcern level snapshot reads&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f506c31a839989dbe2995c371ec726a9ec168f89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f506c31a839989dbe2995c371ec726a9ec168f89&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1796999" author="milkie" created="Tue, 6 Feb 2018 17:48:35 +0000"  >&lt;p&gt;Correct, this is only for interim.  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33004&quot; title=&quot;Add two-phase locking for snapshot reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33004&quot;&gt;&lt;del&gt;SERVER-33004&lt;/del&gt;&lt;/a&gt; is the complete solution.&lt;/p&gt;</comment>
                            <comment id="1796896" author="kaloian.manassiev" created="Tue, 6 Feb 2018 16:48:09 +0000"  >&lt;p&gt;Just to be clear, this is only a temporary solution until we fix the 2PL, right? &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; and I discussed that in the the design document, but holding IX locks for reads goes against the lock manager design principles so we should avoid it.&lt;/p&gt;</comment>
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            <issuekey id="498023">SERVER-33336</issuekey>
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