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    <title>MongoDB Jira</title>
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    <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-66960] Don&apos;t lock session catalog to find highest child txnNumber to refresh transaction participant</title>
                <link>https://jira.mongodb.org/browse/SERVER-66960</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently a transaction participant will get the highest txnNumber the SessionCatalog has seen for any transaction in the current logical session when refreshing the participant from disk. This is to avoid reading more config.transactions entries than necessary. This is gotten from the SessionRuntimeInfo of the participant&apos;s session from the SessionCatalog. By this point, the participant has already checked out the session once, so we should be able to avoid looking back into the SessionCatalog (and locking its mutex) by caching the highest seen txnNumber onto the participant&apos;s Session, which is accessible directly in the transaction participant code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2060535">SERVER-66960</key>
            <summary>Don&apos;t lock session catalog to find highest child txnNumber to refresh transaction participant</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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, 2 Jun 2022 14:15:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:25 +0000</updated>
                            <resolved>Thu, 2 Jun 2022 18:53:11 +0000</resolved>
                                                    <fixVersion>6.0.0-rc9</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4591092" author="xgen-internal-githook" created="Thu, 2 Jun 2022 19:21:56 +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-66960&quot; title=&quot;Don&amp;#39;t lock session catalog to find highest child txnNumber to refresh transaction participant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66960&quot;&gt;&lt;del&gt;SERVER-66960&lt;/del&gt;&lt;/a&gt; Cache highest child txnNumber on checked out sessions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b2f773225a555d581e547527a8cb67bdeed7fadc)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5fc426665b3579c7ed58d6db2eb64279d7ae34e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5fc426665b3579c7ed58d6db2eb64279d7ae34e6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4590981" author="xgen-internal-githook" created="Thu, 2 Jun 2022 18:51:16 +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-66960&quot; title=&quot;Don&amp;#39;t lock session catalog to find highest child txnNumber to refresh transaction participant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66960&quot;&gt;&lt;del&gt;SERVER-66960&lt;/del&gt;&lt;/a&gt; Cache highest child txnNumber on checked out sessions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b2f773225a555d581e547527a8cb67bdeed7fadc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b2f773225a555d581e547527a8cb67bdeed7fadc&lt;/a&gt;&lt;/p&gt;</comment>
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