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    <title>MongoDB Jira</title>
    <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-36241] Disable implicit session in major_version_upgrade.js for versions &lt;= 3.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-36241</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="575027">SERVER-36241</key>
            <summary>Disable implicit session in major_version_upgrade.js for versions &lt;= 3.6</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Jul 2018 15:47:20 +0000</created>
                <updated>Mon, 23 Jul 2018 22:21:19 +0000</updated>
                            <resolved>Mon, 23 Jul 2018 20:07:07 +0000</resolved>
                                                                    <component>Sharding</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1954335" author="misha.tyulenev" created="Mon, 23 Jul 2018 22:21:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.whalen&quot; class=&quot;user-hover&quot; rel=&quot;ian.whalen&quot;&gt;ian.whalen&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36248&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-36248&lt;/a&gt; is the fix.&lt;/p&gt;</comment>
                            <comment id="1954315" author="ian@10gen.com" created="Mon, 23 Jul 2018 22:00:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; can you please point to the ticket that will actually fix this?    I&apos;m trying to resolve a 100% test failure in master:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_multiversion_0c532a429d4e6f1d8473b6b4f04bf21f6b6f76cb_18_07_23_20_40_12&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_multiversion_0c532a429d4e6f1d8473b6b4f04bf21f6b6f76cb_18_07_23_20_40_12&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1954163" author="misha.tyulenev" created="Mon, 23 Jul 2018 20:07:07 +0000"  >&lt;p&gt;I think that the correct fix is changing the server code (no the test script). &lt;br/&gt;
The issue is at the intersection of the following:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Mongo drivers v3.6 use implicit sessions regardless if the binary is FCV3.4 or FCV3.6: &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;&lt;/li&gt;
	&lt;li&gt;MongoDB fails upgrade /downgrade if it creates sessions collection: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35795&quot; title=&quot;3.4 secondaries crashing after some time with 3.6 primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35795&quot;&gt;&lt;del&gt;SERVER-35795&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34683&quot; title=&quot;Downgrade replicaset from 3.6.4 to 3.4.14 fails due to the presence of `config.system.sessions`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34683&quot;&gt;&lt;del&gt;SERVER-34683&lt;/del&gt;&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;so this leads that for the transient FCV3.4 we need some form of a non -persistent sessions supported by a server i.e. provide the best effort and predictable failure which allows drivers to use implicit sessions with FCV3.4&lt;/p&gt;</comment>
                            <comment id="1953805" author="ian@10gen.com" created="Mon, 23 Jul 2018 16:00:04 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=greg.mckeon&quot; class=&quot;user-hover&quot; rel=&quot;greg.mckeon&quot;&gt;greg.mckeon&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; I&apos;m putting this in Needs Triage ASAP because it appears to be breaking the build in master.&lt;/p&gt;</comment>
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