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    <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-32240] Don&apos;t include unnecessary $v field in oplog entries</title>
                <link>https://jira.mongodb.org/browse/SERVER-32240</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;UpdateDriver::update() generates a &quot;$v&quot; field to indicate what version of the update language was used to apply the logged update, which is necessary for heterogeneous replica sets that may include nodes supporting multiple versions of the update language.&lt;/p&gt;

&lt;p&gt;Any replica set that cannot include nodes with binVersion &amp;lt;= 3.6, however, can safely elide this field. Newer mongod versions will always apply updates with &quot;kUpdateNode&quot; semantics and will always assume &quot;kUpdateNode&quot; semantics from updates in the oplog.&lt;/p&gt;

&lt;p&gt;Eliding the &quot;$v&quot; field will save some space in the oplog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="470057">SERVER-32240</key>
            <summary>Don&apos;t include unnecessary $v field in oplog entries</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Fri, 8 Dec 2017 21:11:29 +0000</created>
                <updated>Tue, 6 Dec 2022 03:44:34 +0000</updated>
                            <resolved>Thu, 3 Sep 2020 14:31:24 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="3374311" author="david.storch" created="Thu, 3 Sep 2020 14:31:12 +0000"  >&lt;p&gt;Closing as &quot;Won&apos;t Do&quot; per &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.boros&quot; class=&quot;user-hover&quot; rel=&quot;ian.boros&quot;&gt;ian.boros&lt;/a&gt;&apos;s comment above. The &lt;tt&gt;$v&lt;/tt&gt; field is now used to indicate the version of the oplog format used for updates. There are currently separate &lt;tt&gt;$v:1&lt;/tt&gt; and &lt;tt&gt;$v:2&lt;/tt&gt; encodings of oplog entries for updates. Even if we remove support for &lt;tt&gt;$v:1&lt;/tt&gt; in a future version, it may be helpful to keep the version number in place in order to future-proof the system for a hypothetical future implementation of &lt;tt&gt;$v:3&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="3273102" author="ian.boros" created="Tue, 7 Jul 2020 18:39:48 +0000"  >&lt;p&gt;I&apos;m putting this into the shrink oplog entries epic so we can investigate closing it as &quot;Won&apos;t Fix.&quot; At the time this ticket was filed, the $v field had only one possible value (on master) so eliding it made sense. In 4.6, nodes will use the $v field with value 2 to mark delta-style oplog entries.&lt;/p&gt;</comment>
                            <comment id="1747430" author="justin.seyster" created="Fri, 8 Dec 2017 21:37:24 +0000"  >&lt;p&gt;Will do. The &quot;$v&quot; field only lives in update documents and is new in 3.6, so I don&apos;t think it should affect backup or initial sync at all, but a consult won&apos;t hurt. This is something we have planned for a release or two in the future.&lt;/p&gt;</comment>
                            <comment id="1747401" author="schwerin" created="Fri, 8 Dec 2017 21:21:57 +0000"  >&lt;p&gt;Please confer with a repl engineer before implementing this. It may have some impact on backup or initial sync.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="420534">SERVER-30854</issuekey>
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