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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-38135] Do not allow transactions on shard servers when the featureCompatibilityVersion is 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-38135</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We must not allow transactions on shard servers when the featureCompatibilityVersion is 4.0.&lt;/p&gt;

&lt;p&gt;When a replica set is part of a sharded cluster, we can issue transaction commands through multiple routers. This allows us to target primaries in decreasing term order, which can lead to an anomaly where a transaction can go from aborted to committed. This is addressed in FCV 4.2 by performing a write when a transaction is aborted (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38132&quot; title=&quot;Aborting a transaction must always update config.transactions and write an abort oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38132&quot;&gt;&lt;del&gt;SERVER-38132&lt;/del&gt;&lt;/a&gt;) and aborting a transaction when we return &lt;tt&gt;NoSuchTransaction&lt;/tt&gt; (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38133&quot; title=&quot;When asked to continue a transaction whose txnNumber is too new, TransactionParticipant must abort that transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38133&quot;&gt;&lt;del&gt;SERVER-38133&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="633976">SERVER-38135</key>
            <summary>Do not allow transactions on shard servers when the featureCompatibilityVersion is 4.0</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>prepare_optional</label>
                            <label>prepare_upgrade_downgrade</label>
                    </labels>
                <created>Wed, 14 Nov 2018 20:59:42 +0000</created>
                <updated>Tue, 6 Dec 2022 03:12:38 +0000</updated>
                            <resolved>Fri, 17 May 2019 18:49:09 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2107162" author="judah.schvimer" created="Mon, 7 Jan 2019 15:34:58 +0000"  >&lt;p&gt;I think that makes sense. I&apos;ll leave it open but mark it as &quot;optional&quot;.&lt;/p&gt;</comment>
                            <comment id="2106166" author="tess.avitabile" created="Fri, 4 Jan 2019 21:52:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;, this is no longer needed to ensure correctness of the &lt;tt&gt;TransientTransactionError&lt;/tt&gt; label, since in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38850&quot; title=&quot;Perform noop write before returning NoSuchTransaction error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38850&quot;&gt;&lt;del&gt;SERVER-38850&lt;/del&gt;&lt;/a&gt;, we will &lt;b&gt;always&lt;/b&gt; perform the noop write when returning &lt;tt&gt;NoSuchTransaction&lt;/tt&gt;, including in FCV 4.0. However, we may wish to do it anyway, since it would be odd behavior for a mixed 4.0/4.2 cluster if you could perform a single-shard transaction if the 4.2 node was primary, but not if the 4.0 node was primary. I&apos;ll leave it up to you to decide whether to close this ticket.&lt;/p&gt;</comment>
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            <issuekey id="633970">SERVER-38132</issuekey>
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            <issuelink>
            <issuekey id="633972">SERVER-38133</issuekey>
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            <issuekey id="633973">SERVER-38134</issuekey>
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