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    <title>MongoDB Jira</title>
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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-61867] Clean up wire versions older than WireVersion::WIRE_VERSION_50</title>
                <link>https://jira.mongodb.org/browse/SERVER-61867</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current version of mongo and onwards will never have to talk to any mongo with a wire version less than&#160;WireVersion::WIRE_VERSION_50, so checks against, tests of, and all other references to lower wire versions should be removed from the codebase.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Note that this is something that will crop up every time LTS changes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1941734">SERVER-61867</key>
            <summary>Clean up wire versions older than WireVersion::WIRE_VERSION_50</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="gabriel.marks@mongodb.com">Gabriel Marks</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Thu, 2 Dec 2021 21:56:59 +0000</created>
                <updated>Tue, 6 Dec 2022 00:45:02 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4248060" author="vishnu.kaushik" created="Tue, 14 Dec 2021 21:57:22 +0000"  >&lt;p&gt;I spoke to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xuerui.fa&quot; class=&quot;user-hover&quot; rel=&quot;xuerui.fa&quot;&gt;xuerui.fa&lt;/a&gt; and removing old wire versions was not a part of Minimize Per-Release Code Changes.&lt;/p&gt;

&lt;p&gt;Some references to old wire versions in the code, such as &lt;a href=&quot;https://github.com/mongodb/mongo/blob/56d055c507a94a70e31a014142934060b76710ed/src/mongo/s/mongos_main.cpp#L164-L167&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this one in &lt;tt&gt;mongos&lt;/tt&gt;&lt;/a&gt;, seem to be important since they make sure incompatible nodes cannot speak to the &lt;tt&gt;mongos&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Others in unit tests such as &lt;a href=&quot;https://github.com/mongodb/mongo/blob/56d055c507a94a70e31a014142934060b76710ed/src/mongo/client/sdam/server_selector_test.cpp#L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; can probably be replaced by a newer reference, but I don&apos;t know if there is value to doing that. We might want the old constants to stick around since there is some meaning attached to them (in the particular link above, the it denotes the new message format that is being used).&lt;/p&gt;

&lt;p&gt;Some more uses of old wire version constants in the initial sync area are already being cleaned up in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61505&quot; title=&quot;Remove checks in initial sync code that check the sync source wireVersion for resumable initial sync feature compatibility&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61505&quot;&gt;&lt;del&gt;SERVER-61505&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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