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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-38466] Repeated reads concurrency workloads should reset prevDocuments when entire transaction is retried</title>
                <link>https://jira.mongodb.org/browse/SERVER-38466</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The concurrency workloads &lt;tt&gt;multi_statement_transaction_atomicity_isolation_repeated_reads.js&lt;/tt&gt; and &lt;tt&gt;multi_statement_transaction_simple_repeated_reads.js&lt;/tt&gt;&#160;start transactions with snapshot read concern and run several repeated collection scans, asserting the same documents are returned by each query. They do so by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/jstests/concurrency/fsm_workloads/multi_statement_transaction_simple_repeated_reads.js#L34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;saving the results of each scan to a variable &lt;tt&gt;prevDocuments&lt;/tt&gt;&lt;/a&gt;&#160;(initially undefined) and asserting &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/jstests/concurrency/fsm_workloads/multi_statement_transaction_simple_repeated_reads.js#L27-L31&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if &lt;tt&gt;prevDocuments&lt;/tt&gt;&#160;has been set that it equals the most recent result&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The problem is that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/jstests/concurrency/fsm_workloads/multi_statement_transaction_simple_repeated_reads.js#L17&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;prevDocuments&lt;/tt&gt; is defined outside&lt;/a&gt; of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/jstests/concurrency/fsm_workloads/multi_statement_transaction_simple_repeated_reads.js#L19-L36&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transaction retry loop&lt;/a&gt;, so if a transaction aborts with a TransientTransactionError and is retried with a higher txnNumber, &lt;tt&gt;prevDocuments&lt;/tt&gt; will not be overwritten and may contain the results from a read in an earlier transaction, which the new transaction is not guaranteed to also return (since the test is concurrently modifying documents in the collection). Instead, &lt;tt&gt;prevDocuments&lt;/tt&gt; should be reset within the transaction retry loop to prevent this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="647576">SERVER-38466</key>
            <summary>Repeated reads concurrency workloads should reset prevDocuments when entire transaction is retried</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Dec 2018 19:29:10 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:00 +0000</updated>
                            <resolved>Mon, 10 Dec 2018 22:51:58 +0000</resolved>
                                                    <fixVersion>4.1.7</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2086433" author="xgen-internal-githook" created="Mon, 10 Dec 2018 22:50:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38466&quot; title=&quot;Repeated reads concurrency workloads should reset prevDocuments when entire transaction is retried&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38466&quot;&gt;&lt;del&gt;SERVER-38466&lt;/del&gt;&lt;/a&gt; Repeated reads concurrency workloads should reset previous documents before retrying transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9eb792842f125e3f087e9fa7b197eec5733739c0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9eb792842f125e3f087e9fa7b197eec5733739c0&lt;/a&gt;&lt;/p&gt;</comment>
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