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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-40683] Make wall clock times in replication structures required after 4.2</title>
                <link>https://jira.mongodb.org/browse/SERVER-40683</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40078&quot; title=&quot;Add wall clock time corresponding to lastCommitted optime to optimes subdocument&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40078&quot;&gt;&lt;del&gt;SERVER-40078&lt;/del&gt;&lt;/a&gt; introduces wall clock times to several replication structures. To address mixed version communication, wall clock times are only required to be in these structures when the FCV is 4.2, such as in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8bf694e5ede3bbc95c9b07471ef034c9761a378/src/mongo/rpc/metadata/oplog_query_metadata.cpp#L104&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;OplogQueryMetadata::readFromMetadata&lt;/tt&gt;&lt;/a&gt;. These wall clock times should be required unconditionally after the 4.2 release. We could additionally consider adding the following invariant to &lt;tt&gt;MemberData::setLastAppliedOpTimeAndWallTime&lt;/tt&gt;, &lt;tt&gt;MemberData::setLastDurableOpTimeAndWallTime&lt;/tt&gt;, &lt;tt&gt;MemberData::advanceLastDurableOpTimeAndWallTime&lt;/tt&gt;, and &lt;tt&gt;MemberData::advanceLastAppliedOpTimeAndWallTime&lt;/tt&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;invariant(opTime.opTime.isNull() || opTime.wallTime != Date_t::min())&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8bf694e5ede3bbc95c9b07471ef034c9761a378/src/mongo/db/repl/optime.h#L165&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;default value for &lt;tt&gt;wallTime&lt;/tt&gt;&lt;/a&gt; in &lt;tt&gt;OpTimeAndWallTime&lt;/tt&gt; is &lt;tt&gt;Date_t::min()&lt;/tt&gt;, so adding this invariant will ensure that a meaningful wall clock time is passed to these functions when a meaningful &lt;tt&gt;OpTime&lt;/tt&gt; is passed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="739994">SERVER-40683</key>
            <summary>Make wall clock times in replication structures required after 4.2</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                            <label>Upgrade/Downgrade</label>
                    </labels>
                <created>Tue, 16 Apr 2019 21:19:36 +0000</created>
                <updated>Tue, 6 Dec 2022 03:01:33 +0000</updated>
                            <resolved>Wed, 31 Jul 2019 21:15:16 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2353154" author="jason.chan" created="Wed, 31 Jul 2019 21:15:16 +0000"  >&lt;p&gt;This work will be done as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42485&quot; title=&quot;Remove FCV  checks gating reporting wall clock times in Replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42485&quot;&gt;&lt;del&gt;SERVER-42485&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2230935" author="maria.vankeulen" created="Wed, 1 May 2019 18:57:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40737&quot; title=&quot;Use Date_t() as default wallTime value in OpTimeAndWallTimes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40737&quot;&gt;&lt;del&gt;SERVER-40737&lt;/del&gt;&lt;/a&gt; plans to change the default value of the wall clock time to Date_t(). The invariant I suggested adding should compare against Date_t() once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40737&quot; title=&quot;Use Date_t() as default wallTime value in OpTimeAndWallTimes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40737&quot;&gt;&lt;del&gt;SERVER-40737&lt;/del&gt;&lt;/a&gt; is pushed.&lt;/p&gt;</comment>
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            <issuekey id="741887">SERVER-40737</issuekey>
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            <issuekey id="798802">SERVER-41650</issuekey>
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            <issuelink>
            <issuekey id="714882">SERVER-40078</issuekey>
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            <issuelink>
            <issuekey id="531844">SERVER-34598</issuekey>
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