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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-59772] Enable setWindowFields in transactions or with readConcern snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-59772</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1867119">SERVER-59772</key>
            <summary>Enable setWindowFields in transactions or with readConcern snapshot</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="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="ted.tuckman@mongodb.com">Ted Tuckman</reporter>
                        <labels>
                            <label>qopt-team</label>
                            <label>query-director-triage</label>
                    </labels>
                <created>Fri, 3 Sep 2021 13:25:12 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:54 +0000</updated>
                            <resolved>Wed, 15 Dec 2021 19:57:25 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4251704" author="xgen-internal-githook" created="Wed, 15 Dec 2021 19:52:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;, &apos;username&apos;: &apos;TedTuckman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59772&quot; title=&quot;Enable setWindowFields in transactions or with readConcern snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59772&quot;&gt;&lt;del&gt;SERVER-59772&lt;/del&gt;&lt;/a&gt; Enable setWindowFields in transactions and with read concern snapshot&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4b4d4f729e0846590fa9602d96c308018c54399c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4b4d4f729e0846590fa9602d96c308018c54399c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4050829" author="charlie.swanson" created="Fri, 10 Sep 2021 20:32:50 +0000"  >&lt;p&gt;After discussing with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ted.tuckman&quot; class=&quot;user-hover&quot; rel=&quot;ted.tuckman&quot;&gt;ted.tuckman&lt;/a&gt;, we believe there is risk that a read which specifies &lt;tt&gt;readConcern: {level: &quot;snapshot&quot;}&#160;&lt;/tt&gt; will either not observe snapshot isolation (bad), or will enter an unknown and potentially corrupted state within the WiredTiger storage engine, with unknown consequences.&lt;/p&gt;

&lt;p&gt;We believe there is risk because the implementation of spilling to disk within a WiredTiger temporary table repeatedly &quot;abandons snapshot&quot; to ensure that new reads and writes will read from the most recent snapshot. We realized recently that this (potentially) has broader implications for the rest of the operation.&lt;/p&gt;

&lt;p&gt;As far as I know, we don&apos;t yet know if this is a real problem, and what a fix might look like. I recommend putting this in &quot;Investigating&quot; on my team &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=steve.la&quot; class=&quot;user-hover&quot; rel=&quot;steve.la&quot;&gt;steve.la&lt;/a&gt;. Tagging with &quot;query-director-triage&quot; for visibility.&lt;/p&gt;</comment>
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            <issuekey id="1875450">SERVER-59969</issuekey>
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            <issuekey id="1896773">SERVER-60639</issuekey>
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            <issuekey id="1877120">SERVER-60038</issuekey>
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