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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-31648] isMaster should unset the kPending tag and set the kLatestVersionInternalClientKeepOpen tag in one operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-31648</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Before a 3.6 internal client has issued its initial isMaster command, its SessionHandle is protected from being terminated by the kPending tag. The isMaster command removes the kPending status but (when the client is new enough) adds kLatestVersionInternalClientKeepOpen status, which protects the session from being terminated by a featureCompatibilityVersion upgrade.&lt;/p&gt;

&lt;p&gt;However, there is a small window between the unset and the set during which there is nothing to stop a featureCompatibilityVersion upgrade from terminating the session, which is causing failed updates and inserts in the toggle_feature_compatibility.js test.&lt;/p&gt;</description>
                <environment></environment>
        <key id="448355">SERVER-31648</key>
            <summary>isMaster should unset the kPending tag and set the kLatestVersionInternalClientKeepOpen tag in one operation</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Oct 2017 20:12:18 +0000</created>
                <updated>Mon, 30 Oct 2023 23:12:37 +0000</updated>
                            <resolved>Mon, 6 Nov 2017 19:57:17 +0000</resolved>
                                                    <fixVersion>3.6.0-rc3</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1717903" author="xgen-internal-githook" created="Mon, 6 Nov 2017 19:34:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;username&apos;: &apos;jseyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31648&quot; title=&quot;isMaster should unset the kPending tag and set the kLatestVersionInternalClientKeepOpen tag in one operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31648&quot;&gt;&lt;del&gt;SERVER-31648&lt;/del&gt;&lt;/a&gt; Perform sets/unsets to session tags atomically.&lt;/p&gt;

&lt;p&gt;As described in the SERVER ticket, there is a window in&lt;br/&gt;
CmdIsMaster::run() during which there is no flag set to prevent a&lt;br/&gt;
session from being closed by an FCV update (even when the session is&lt;br/&gt;
one that should stay open through the upgrade). This change closes&lt;br/&gt;
that window.&lt;/p&gt;

&lt;p&gt;As part of the fix, this change also replaces the replaceTags()&lt;br/&gt;
function with functions that can atomically update the session tags.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/df03dc67fa491b944dd1e6c366f4a19cf6b38032&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/df03dc67fa491b944dd1e6c366f4a19cf6b38032&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="432948">SERVER-31265</issuekey>
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