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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-27668] Remove unnecessary fields in ReplSetMetadata</title>
                <link>https://jira.mongodb.org/browse/SERVER-27668</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27543&quot; title=&quot;Create new metadata for oplog queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27543&quot;&gt;&lt;del&gt;SERVER-27543&lt;/del&gt;&lt;/a&gt; describes how we created the OplogQueryMetadata with duplicated fields that were meant to move into OplogQueryMetadata from ReplSetMetadata. In 3.8 we can remove the duplicated fields from ReplSetMetadata as well as the lastOpVisible which no longer should have any users. As part of this work we will need to start processing the OplogQueryMetadata in the OplogFetcher to update our local state similar to what we currently do with the ReplSetMetadata. In 3.8 we can be confident that all OplogFetcher responses will contain the OplogQueryMetadata since it can only be in a mixed replica-set with 3.6, which knows how to return the OplogQueryMetadata.&lt;/p&gt;</description>
                <environment></environment>
        <key id="345101">SERVER-27668</key>
            <summary>Remove unnecessary fields in ReplSetMetadata</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="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="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Thu, 12 Jan 2017 22:20:00 +0000</created>
                <updated>Tue, 6 Dec 2022 04:08:04 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3323925" author="vesselina.ratcheva" created="Thu, 6 Aug 2020 02:21:01 +0000"  >&lt;p&gt;PM-1791 requires the &lt;tt&gt;lastOpVisible&lt;/tt&gt; to stay in ReplSetMetadata. The cloners will cache this every batch so that we know how much oplog we need to apply to be consistent.&lt;/p&gt;</comment>
                            <comment id="2997948" author="jesse" created="Wed, 25 Mar 2020 16:40:40 +0000"  >&lt;p&gt;We &lt;b&gt;do&lt;/b&gt; now process OplogQueryMetadata in OplogFetcher. The rest of this ticket is still incomplete.&lt;/p&gt;</comment>
                            <comment id="2358326" author="jason.chan" created="Mon, 5 Aug 2019 19:11:53 +0000"  >&lt;p&gt;We shouldn&apos;t remove lastopCommitted from ReplSetMetadata since as of v4.2, the last committed wall time is required.&lt;/p&gt;</comment>
                            <comment id="1498282" author="spencer" created="Tue, 14 Feb 2017 00:11:27 +0000"  >&lt;p&gt;Moving this into Needs Triage until we can move it into a bucket for work for 3.8&lt;/p&gt;</comment>
                            <comment id="1490400" author="judah.schvimer" created="Wed, 1 Feb 2017 21:52:40 +0000"  >&lt;p&gt;lastOpCommitted may need to stay in the ReplSetMetadata for now since it&apos;s used to update the commit point on arbiters, and is used in sharding.&lt;/p&gt;</comment>
                            <comment id="1476660" author="spencer" created="Fri, 13 Jan 2017 20:11:37 +0000"  >&lt;p&gt;We&apos;ll need to be processing the OplogQueryMetadata in the OplogFetcher in 3.6 so that when 3.8 stops sending those fields in the ReplSetMetadata we don&apos;t break mixed 3.6-3.8 operation.&lt;/p&gt;</comment>
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            <issuekey id="1145415">SERVER-46120</issuekey>
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