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    <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-72985] FSM workloads which use the connection cache features should automatically opt-out of using transactions in passthroughs</title>
                <link>https://jira.mongodb.org/browse/SERVER-72985</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ece0ba47a37bb232f103624f4033874abe26ade/jstests/concurrency/fsm_libs/fsm.js#L108-L120&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;concurrency&amp;#42;.yml test suite which set &lt;tt&gt;TestData.runInsideTransaction = true&lt;/tt&gt; use withTxnAndAutoRetry() to start and automatically retry a transaction until it commits&lt;/a&gt;. This allows operations run by a &lt;tt&gt;$config.states&lt;/tt&gt; function to implicitly be performed inside a transaction without changing the FSM workload itself.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ece0ba47a37bb232f103624f4033874abe26ade/jstests/concurrency/fsm_libs/fsm.js#L38-L101&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Some FSM workloads enable the connection cache&lt;/a&gt; to allow reading from a secondary member of a replica set or shards and config servers in a sharded cluster. The changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19630&quot; title=&quot;FSM tests - capability to run against existing clusters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19630&quot;&gt;&lt;del&gt;SERVER-19630&lt;/del&gt;&lt;/a&gt; additionally made it so the operations on these other nodes in the cluster use the same underlying DriverSession object. This was motivated by wanting to ensuring causal consistency when reading from other members. However, using the same underlying DriverSession object also means the FSM workload is able to start a transaction on the config server replica set which won&apos;t automatically be committed by the withTxnAndAutoRetry() because the withTxnAndAutoRetry() function receive a DriverSession associated with a mongos connection object. And because the testing&amp;#45;default transaction lifetime limit is 24 hours, an FSM workload which leaks a transaction on a shard or config server will cause a timeout in Evergreen.&lt;/p&gt;

&lt;p&gt;We should instead have any &lt;tt&gt;$config.states&lt;/tt&gt; function which makes use the connection cache automatically opt&amp;#45;out of runnings its operations within a transaction. This sacrifices a small amount of test coverage for little effort because usage of the connection cache is uncommon in FSM workloads. (A more complete solution might be to opt&amp;#45;out of using transactions only for operations using connections from the connection cache. But this would require revisiting how to provide causal consistency when using the connection cache without also sharing the transaction state of the DriverSession.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2236129">SERVER-72985</key>
            <summary>FSM workloads which use the connection cache features should automatically opt-out of using transactions in passthroughs</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Jan 2023 15:33:25 +0000</created>
                <updated>Sun, 29 Oct 2023 21:27:57 +0000</updated>
                            <resolved>Fri, 20 Jan 2023 05:53:23 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5122237" author="xgen-internal-githook" created="Wed, 18 Jan 2023 21:35:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72985&quot; title=&quot;FSM workloads which use the connection cache features should automatically opt-out of using transactions in passthroughs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72985&quot;&gt;&lt;del&gt;SERVER-72985&lt;/del&gt;&lt;/a&gt; Avoid implicit transaction in state functions w/ connCache.&lt;/p&gt;

&lt;p&gt;Forces a $config.states FSM function which makes use of the connection&lt;br/&gt;
cache feature in the concurrency framework to run outside of a&lt;br/&gt;
transaction.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cc58f8f410d34800f2ec2a8b9805bddd079f366a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cc58f8f410d34800f2ec2a8b9805bddd079f366a&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2178950">SERVER-71203</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="545246">SERVER-35037</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="223037">SERVER-19630</issuekey>
        </issuelink>
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