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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-76368] Allow TransactionRouter on a mongod to early reap retryable sessions</title>
                <link>https://jira.mongodb.org/browse/SERVER-76368</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Retryable sessions used for retryable transactions have special rules for when they can be reaped from the SessionCatalog. Each session is tied to a txnNumber for some client session and can be reaped once a transaction or retryable write with a higher txnNumber has started on that client session. To remove retryable sessions as soon as possible, they are erased from the SessionCatalog after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e4af7edec98c1b05b2b16fd4e664777f6a5cb398/src/mongo/db/session/session_catalog.cpp#L343-L350&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a new transaction/retryable write starts on a mongos or mongod and the session of the new write is released&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This logic does not currently work when a mongod accesses the same retryable session from the router and participant roles (ie TransactionRouter and TransactionParticipant). The participant keeps a map of retryable sessions for the latest transaction, so if the router role tries to clear a retryable session, it may still be in the map, and if the same process accesses that session in the participant role, it may use the freed session and crash. There are very few remote transactions run from a mongod currently, so early reaping was disabled in the router role on a mongod (in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75919&quot; title=&quot;Investigate if runTransactionOnShardingCatalog should always use cluster transaction API&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75919&quot;&gt;&lt;del&gt;SERVER-75919&lt;/del&gt;&lt;/a&gt;), but we should enable the reaping safely.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2320314">SERVER-76368</key>
            <summary>Allow TransactionRouter on a mongod to early reap retryable sessions</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Apr 2023 20:57:13 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:44 +0000</updated>
                            <resolved>Wed, 10 May 2023 14:13:12 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5415129" author="xgen-internal-githook" created="Wed, 10 May 2023 16:33:02 +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-76368&quot; title=&quot;Allow TransactionRouter on a mongod to early reap retryable sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76368&quot;&gt;&lt;del&gt;SERVER-76368&lt;/del&gt;&lt;/a&gt; Allow TransactionRouter on a mongod to early reap retryable sessions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c5bde8dfab169ae2e020eef3e3c1bab8c5f6e841)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ab3b55115c0dddd7918ec57d4b122afcb9ba305&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ab3b55115c0dddd7918ec57d4b122afcb9ba305&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5413315" author="xgen-internal-githook" created="Wed, 10 May 2023 01:30:05 +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-76368&quot; title=&quot;Allow TransactionRouter on a mongod to early reap retryable sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76368&quot;&gt;&lt;del&gt;SERVER-76368&lt;/del&gt;&lt;/a&gt; Allow TransactionRouter on a mongod to early reap retryable sessions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5bde8dfab169ae2e020eef3e3c1bab8c5f6e841&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5bde8dfab169ae2e020eef3e3c1bab8c5f6e841&lt;/a&gt;&lt;/p&gt;</comment>
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