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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33763] 3.6 drivers fail to communicate with 3.6 sharded clusters running at FCV 3.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-33763</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 3.6 the MongoDB drivers added implicit support for sessions, which is triggered by the presence of the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/sessions/driver-sessions.rst#how-to-check-whether-a-deployment-supports-sessions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;logicalSessionTimeoutMinutes field&lt;/a&gt; in the &lt;tt&gt;isMaster&lt;/tt&gt; response.&lt;/p&gt;

&lt;p&gt;In 3.6, MongoS will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.3/src/mongo/s/server.cpp#L488&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;always set&lt;/a&gt; its internal FCV to 3.6, regardless of the FCV of the shards and as a result it will always &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bf53cbe298bc6724b1f2b5bf16afbd9e3876c623/src/mongo/s/commands/cluster_is_master_cmd.cpp#L117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;report &lt;tt&gt;logicalSessionTimeoutMinutes&lt;/tt&gt;&lt;/a&gt; in the isMaster response. This, combined with the drivers&apos; spec means that the driver will always send session information, regardless of the FCV version of the shards.&lt;/p&gt;

&lt;p&gt;Shards, which are at FCV 3.4 will reject any requests which contain session information and this essentially means that 3.6 drivers cannot be used to talk to a cluster which is at FCV 3.4.&lt;/p&gt;</description>
                <environment></environment>
        <key id="508062">SERVER-33763</key>
            <summary>3.6 drivers fail to communicate with 3.6 sharded clusters running at FCV 3.4</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Mar 2018 21:38:34 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:08 +0000</updated>
                            <resolved>Wed, 14 Mar 2018 17:56:24 +0000</resolved>
                                    <version>3.6.0</version>
                                    <fixVersion>3.6.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="1833827" author="xgen-internal-githook" created="Wed, 14 Mar 2018 17:49:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33763&quot; title=&quot;3.6 drivers fail to communicate with 3.6 sharded clusters running at FCV 3.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33763&quot;&gt;&lt;del&gt;SERVER-33763&lt;/del&gt;&lt;/a&gt; Add FCV checks on txnNumber when initializing session info&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/239a5e7445381f719d7d68e821c5fc5c043c8043&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/239a5e7445381f719d7d68e821c5fc5c043c8043&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1831448" author="renctan" created="Mon, 12 Mar 2018 21:49:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mira.carey%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mira.carey@mongodb.com&quot;&gt;mira.carey@mongodb.com&lt;/a&gt;: Just want to confirm: we want to keep the logicalSessionTimeoutMinutes suppression in v3.6, right?&lt;/p&gt;</comment>
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