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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-31777] Explicitly deactivate logical sessions under FCV34</title>
                <link>https://jira.mongodb.org/browse/SERVER-31777</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jmikola&quot; class=&quot;user-hover&quot; rel=&quot;jmikola&quot;&gt;jmikola&lt;/a&gt; explained in SPEC-974:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;In the case of feature compatibility being downgraded, I believe there is still a risk that the client believes a server supports sessions (and retryable writes) when it does not.&lt;/p&gt;

&lt;p&gt;Consider that when SDAM is initialized, a driver monitors a primary and sees wire version and &lt;tt&gt;logicalSessionTimeoutMinutes&lt;/tt&gt;, which indicates that the server is feature compatibility 3.6. The driver executes a write command that includes the &lt;tt&gt;lsid&lt;/tt&gt; and &lt;tt&gt;txnNumber&lt;/tt&gt; fields. The response for that command is lost in transit, and the driver needs to retry. Before a retry attempt can be made, the server is downgraded to feature compatibility mode 3.4. The retried write command includes the same &lt;tt&gt;lsid&lt;/tt&gt; and &lt;tt&gt;txnNumber&lt;/tt&gt;. The primary, operating in 3.4 feature compatibility mode, will ignore these fields and apply the write a second time.&lt;/p&gt;

&lt;p&gt;The above example considers a downgrade between the first and retry attempt, but a similar race condition exists if the downgrade were to happen between the driver&apos;s last monitoring round (issuing &lt;tt&gt;isMaster&lt;/tt&gt; commands) and the write&apos;s first attempt.&lt;/p&gt;

&lt;p&gt;I think at least one of the following may ensure that there is no risk of ever applying a write multiple times:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The server must close its connections when the feature compatibility mode is downgraded.&lt;/li&gt;
	&lt;li&gt;A 3.6 server should raise an error if a write command includes &lt;tt&gt;lsid&lt;/tt&gt; and &lt;tt&gt;txnNumber&lt;/tt&gt; and feature compatibility mode 3.6 is not enabled.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I believe the error reporting in the second bullet is worth implementing regardless. That would be consistent with what is already done when commands include a &lt;tt&gt;collation&lt;/tt&gt; option on a 3.4 server, and the server does not have feature compatibility mode 3.4 enabled.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Additionally, a 3.6 server operating in FCV 3.4 should suppress &lt;tt&gt;logicalSessionTimeoutMinutes&lt;/tt&gt; from its &lt;tt&gt;isMaster&lt;/tt&gt; response (as originally reported in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31738&quot; title=&quot;fcv34 should suppress logicalSessionTimeoutMinutes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31738&quot;&gt;&lt;del&gt;SERVER-31738&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="453373">SERVER-31777</key>
            <summary>Explicitly deactivate logical sessions under FCV34</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="shane.harvey@mongodb.com">Shane Harvey</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Oct 2017 17:57:15 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:52 +0000</updated>
                            <resolved>Thu, 9 Nov 2017 23:40:17 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Upgrade/Downgrade</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1722185" author="xgen-internal-githook" created="Thu, 9 Nov 2017 23:38:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;username&apos;: &apos;hanumantmk&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31777&quot; title=&quot;Explicitly deactivate logical sessions under FCV34&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31777&quot;&gt;&lt;del&gt;SERVER-31777&lt;/del&gt;&lt;/a&gt; deactivate logical sessions for fcv34&lt;/p&gt;

&lt;p&gt;For anything less than fully upgraded to 3.6:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;suppress logicalSessionTimeoutMinutes in isMaster&lt;/li&gt;
	&lt;li&gt;fail any commands that passes lsid&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bf53cbe298bc6724b1f2b5bf16afbd9e3876c623&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bf53cbe298bc6724b1f2b5bf16afbd9e3876c623&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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