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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-66973] Eagerly reap config.transactions entries for retryable sessions</title>
                <link>https://jira.mongodb.org/browse/SERVER-66973</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sessions spawned to run transactions for retryable writes encode the write&apos;s txnNumber in their session id. When a new retryable write / transaction for that same session arrives with a higher txnNumber, previous sessions can no longer be used, so we are free to reap their config.transactions entries. This should be done more eagerly than waiting for the config.system.sessions entry to expire, since a long running session may run many retryable writes that could each require a transaction and create a config.transactions entry.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2060796">SERVER-66973</key>
            <summary>Eagerly reap config.transactions entries for 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, 2 Jun 2022 17:42:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:23 +0000</updated>
                            <resolved>Tue, 7 Jun 2022 17:54:50 +0000</resolved>
                                                    <fixVersion>6.0.0-rc9</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4600848" author="xgen-internal-githook" created="Tue, 7 Jun 2022 22:28:05 +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-66973&quot; title=&quot;Eagerly reap config.transactions entries for retryable sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66973&quot;&gt;&lt;del&gt;SERVER-66973&lt;/del&gt;&lt;/a&gt; Eagerly reap config.transactions entries for retryable sessions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 77e9ff7fd5e822ed2c560db2f601648a6dd58abf)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/266864d409101588abcad8ebe75dec0cd60bf11c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/266864d409101588abcad8ebe75dec0cd60bf11c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4600207" author="xgen-internal-githook" created="Tue, 7 Jun 2022 17:45:13 +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-66973&quot; title=&quot;Eagerly reap config.transactions entries for retryable sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66973&quot;&gt;&lt;del&gt;SERVER-66973&lt;/del&gt;&lt;/a&gt; Eagerly reap config.transactions entries for retryable sessions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77e9ff7fd5e822ed2c560db2f601648a6dd58abf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77e9ff7fd5e822ed2c560db2f601648a6dd58abf&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2074275">DOCS-15437</issuekey>
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                            <customfieldvalue>This ticket added a component that reaps the persisted metadata associated with sessions spawned within a cluster to run transactions on behalf of user operations. Such internal sessions are buffered in memory until a threshold has been reached and then they are batch deleted. Previously metadata for such sessions would only be reaped once the session of the associated user operation expired.&lt;br/&gt;
&lt;br/&gt;
The docs change needed is that we added a server parameter, _internalSessionsReapThreshold_ which configures the threshold of internal sessions buffered that triggers a batch delete. The threshold defaults to 1000 and can be set to 0 to disable the reaping behavior.</customfieldvalue>

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