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    <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-40991] 4.4 binary in FCV 4.4 should not be able to read oplog entries generated by 4.2 binaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-40991</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Two-phase upgrade/downgrade is supposed to ensure that once a node is in a &quot;fully upgraded&quot; FCV, then it never reads an oplog entry from the previous binary version. Committing a prepared transaction must be able to read an oplog entry behind the commit point. The Global S lock taken during upgrade/downgrade should ensure that no transactions are prepared in one FCV and committed in the other, which should prevent any problem here. &lt;/p&gt;

&lt;p&gt;In testing upgrade/downgrade for 4.4, we should test that in committing a prepared transaction nodes do not read oplog entries generated by 4.2 binaries. Otherwise we will be unable to change the oplog format, or will need to make oplog parsing less strict, at least in this case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="757630">SERVER-40991</key>
            <summary>4.4 binary in FCV 4.4 should not be able to read oplog entries generated by 4.2 binaries</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="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 May 2019 15:40:35 +0000</created>
                <updated>Tue, 6 Dec 2022 03:00:16 +0000</updated>
                            <resolved>Thu, 26 Sep 2019 21:07:52 +0000</resolved>
                                                                    <component>Replication</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2435267" author="judah.schvimer" created="Thu, 26 Sep 2019 21:07:52 +0000"  >&lt;p&gt;We don&apos;t really know how we would test this without actually changing the oplog format, which we don&apos;t currently need to do in 4.4. If we change the oplog format in 4.4, we can revisit this.&lt;/p&gt;</comment>
                            <comment id="2234258" author="judah.schvimer" created="Fri, 3 May 2019 20:14:30 +0000"  >&lt;p&gt;Done!&lt;/p&gt;</comment>
                            <comment id="2234163" author="siyuan.zhou@10gen.com" created="Fri, 3 May 2019 19:27:55 +0000"  >&lt;blockquote&gt;&lt;p&gt;In testing upgrade/downgrade for 4.4, we should test that in committing a prepared transaction nodes do not read oplog entries generated by 4.2 binaries.&lt;/p&gt;&lt;/blockquote&gt;

&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;, would you mind changing the title to be &quot;should not be able&quot;? It&apos;s not clear whether the title describes a desired behavior or a problematic issue.&lt;/p&gt;</comment>
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