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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-41057] Add non-transactional afterClusterTime find to multi_statement_transaction_atomicity_isolation.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-41057</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;afterClusterTime finds don&apos;t get killed automatically on stepdown or stepup. To make sure we don&apos;t deadlock, adding another state that just runs an afterClusterTime find would be useful. I&apos;m not sure if there are any consistency checks we can add as well or anything we can expect from what the find returns, but just running the command may weed out deadlocks involving prepare conflicts outside of transactions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="760760">SERVER-41057</key>
            <summary>Add non-transactional afterClusterTime find to multi_statement_transaction_atomicity_isolation.js</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>prepare_testing</label>
                    </labels>
                <created>Wed, 8 May 2019 18:48:42 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:13 +0000</updated>
                            <resolved>Tue, 21 May 2019 14:25:28 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2254079" author="xgen-internal-githook" created="Tue, 21 May 2019 14:25:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;judah@mongodb.com&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41057&quot; title=&quot;Add non-transactional afterClusterTime find to multi_statement_transaction_atomicity_isolation.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41057&quot;&gt;&lt;del&gt;SERVER-41057&lt;/del&gt;&lt;/a&gt; Add non-transactional afterClusterTime find to multi_statement_transaction_atomicity_isolation.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f36aaeddbb86f47a0bd0dff2e541c73b834f05f7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f36aaeddbb86f47a0bd0dff2e541c73b834f05f7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2245091" author="max.hirschhorn@10gen.com" created="Mon, 13 May 2019 20:34:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e4b13ae68a4eef9393357038f09f14bfd8102050/jstests/concurrency/fsm_workloads/multi_statement_transaction_atomicity_isolation.js#L158-L162&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The &lt;tt&gt;multi_statement_transaction_atomicity_isolation.js&lt;/tt&gt; FSM workload runs a find command inside a multi-statement transaction with &lt;tt&gt;afterClusterTime&lt;/tt&gt;&lt;/a&gt; (because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e4b13ae68a4eef9393357038f09f14bfd8102050/jstests/concurrency/fsm_workloads/multi_statement_transaction_atomicity_isolation.js#L199-L202&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the session was started with causalConsistency=true&lt;/a&gt;) over the entire collection.&lt;/p&gt;

&lt;p&gt;Per an in-person discussion with Judah, I think we&apos;ll want to read ever document in the collection in order to maximize the likelihood of hitting a prepare conflict.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;I&apos;m not sure if there are any consistency checks we can add as well or anything we can expect from what the find returns, but just running the command may weed out deadlocks involving prepare conflicts outside of transactions.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;I agree there isn&apos;t much that&apos;s useful to assert about the state of all of the documents because we&apos;ve lost the guarantee they&apos;re from the same snapshot. Since we&apos;re doing a collection scan we can at least say there should be &lt;tt&gt;this.numDocs&lt;/tt&gt; of them.&lt;/p&gt;</comment>
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            <issuekey id="740577">SERVER-40700</issuekey>
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