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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-36305] Add KillSessions stage to transactions FSM workloads</title>
                <link>https://jira.mongodb.org/browse/SERVER-36305</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="576721">SERVER-36305</key>
            <summary>Add KillSessions stage to transactions FSM workloads</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="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>prepare_testing</label>
                    </labels>
                <created>Thu, 26 Jul 2018 18:34:18 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:30 +0000</updated>
                            <resolved>Tue, 21 Aug 2018 18:21:28 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Replication</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1981558" author="xgen-internal-githook" created="Tue, 21 Aug 2018 18:18:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36305&quot; title=&quot;Add KillSessions stage to transactions FSM workloads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36305&quot;&gt;&lt;del&gt;SERVER-36305&lt;/del&gt;&lt;/a&gt; Add KillSessions stage to transactions FSM workloads&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/49109314652b5861d3a18a7f679bb39a9bebbc0c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/49109314652b5861d3a18a7f679bb39a9bebbc0c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1964538" author="max.hirschhorn@10gen.com" created="Thu, 2 Aug 2018 22:45:29 +0000"  >&lt;p&gt;Per an in-person discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;, we&apos;d eventually like to have coverage around a prepared transaction being aborted (e.g. as a result of the session being killed). An intermediate step along the way is to take one of the existing transactions FSM workloads and create a new version of it that periodically kills an active session. The following describes a new &lt;tt&gt;multi_statement_transaction_kill_sessions.js&lt;/tt&gt; FSM workload:&lt;/p&gt;

&lt;p&gt;1. Extend the &lt;tt&gt;multi_statement_transaction_atomicity_isolation.js&lt;/tt&gt; FSM workload to have a &lt;tt&gt;killSession()&lt;/tt&gt; state function that first runs the refreshLogicalSessionCacheNow testing-only command, then runs the&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    {$listSessions: {}},&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;pipeline to get an arbitrary active session, and then runs the killSessions command with that logical session id. Alternatively, we could just run the killAllSessions command depending on how large of a hammer we want to use. The transition table should be updated so that ~1 thread is running the &lt;tt&gt;killSessions()&lt;/tt&gt; state function at a time - where the other worker threads would be running the &lt;tt&gt;update()&lt;/tt&gt; and &lt;tt&gt;checkConsistency()&lt;/tt&gt; state functions.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Note&lt;/b&gt;: Due to how this FSM workload would kill an active session on the server that&apos;s in use by a different FSM workload, which wouldn&apos;t be equipped to handle the server&apos;s error response from the operation being killed, the &lt;tt&gt;multi_statement_transaction_kill_sessions.js&lt;/tt&gt; FSM workload shouldn&apos;t be run in the &lt;tt&gt;concurrency_simultaneous*.yml&lt;/tt&gt; test suites.&lt;/p&gt;

&lt;p&gt;2. Change the &lt;tt&gt;withTxnAndAutoRetry()&lt;/tt&gt; function defined in &lt;tt&gt;jstests/concurrency/fsm_workload_helpers/auto_retry_transaction.js&lt;/tt&gt; to automatically retry the entire transaction (by calling &lt;tt&gt;func()&lt;/tt&gt; again) on the server&apos;s error response for when the session is killed. We&apos;ll likely only want to enable this mode when running the &lt;tt&gt;multi_statement_transaction_kill_sessions.js&lt;/tt&gt; FSM workload, so the &lt;tt&gt;withTxnAndAutoRetry()&lt;/tt&gt; function should probably take an additional parameter for it. The &lt;tt&gt;multi_statement_transaction_atomicity_isolation.js&lt;/tt&gt; FSM workload could then specify &lt;tt&gt;this.autoRetryOptions&lt;/tt&gt; to the &lt;tt&gt;withTxnAndAutoRetry()&lt;/tt&gt; function (which would be &lt;tt&gt;undefined&lt;/tt&gt; normally) and the &lt;tt&gt;multi_statement_transaction_kill_sessions.js&lt;/tt&gt; FSM workload would set &lt;tt&gt;$config.data.autoRetryOptions&lt;/tt&gt; to be something else.&lt;/p&gt;</comment>
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