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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-63381] Relax optime.js test to account for wallClockTimes move backward.</title>
                <link>https://jira.mongodb.org/browse/SERVER-63381</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I think we are not utilizing the wallClockTime in any consistency related places and we only depends on the opTime which is the cluster causal logical timestamp which encounter the possibility that the wallClockTime can go back in time.&lt;/p&gt;

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

&lt;p&gt;So for this ticket&#160;we are going to only relax the test.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1978661">SERVER-63381</key>
            <summary>Relax optime.js test to account for wallClockTimes move backward.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="m.maher@mongodb.com">Moustafa Maher</assignee>
                                    <reporter username="m.maher@mongodb.com">Moustafa Maher</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Feb 2022 17:00:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:56 +0000</updated>
                            <resolved>Wed, 23 Feb 2022 20:29:29 +0000</resolved>
                                                    <fixVersion>5.3.0-rc2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4372610" author="xgen-internal-githook" created="Wed, 23 Feb 2022 20:21:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Moustafa Maher Khalil&apos;, &apos;email&apos;: &apos;m.maher@mongodb.com&apos;, &apos;username&apos;: &apos;moustafamaher&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63381&quot; title=&quot;Relax optime.js test to account for wallClockTimes move backward.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63381&quot;&gt;&lt;del&gt;SERVER-63381&lt;/del&gt;&lt;/a&gt; Relax optime.js test to account for wallClockTimes move backward&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9adbcce9f18b9a40cd3225d4bc1f06c4894eca67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9adbcce9f18b9a40cd3225d4bc1f06c4894eca67&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4365336" author="JIRAUSER1257896" created="Sat, 19 Feb 2022 00:14:21 +0000"  >&lt;p&gt;We use it also to determine if the preImage is expired or not ( also safe).&lt;/p&gt;</comment>
                            <comment id="4365329" author="JIRAUSER1257896" created="Sat, 19 Feb 2022 00:07:22 +0000"  >&lt;p&gt;I see that we use it also as a lastWrite for &lt;b&gt;SessionTxnRecord&lt;/b&gt;&#160;and then use this timestamp to decide whether to reap the session or not (&lt;b&gt;MongoDSessionCatalog::reapSessionsOlderThan&lt;/b&gt;).&#160;&lt;/p&gt;

&lt;p&gt;This is also safe as the worst that can happen is that the session will be closed sooner.&#160;&lt;/p&gt;</comment>
                            <comment id="4354773" author="JIRAUSER1257896" created="Mon, 14 Feb 2022 22:22:56 +0000"  >&lt;p&gt;I&apos;ve revised the paper for&#160;ClusterTime ticking algorithm and we already handle the case the that the wallClock can go backward, which matches our&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/8a2f52590d92482624723086b88151c93ee56f1c/src/mongo/db/vector_clock_mutable.cpp#L77&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;code.&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/360483/360483_Screen+Shot+2022-02-14+at+2.21.29+PM.png&quot; height=&quot;392&quot; width=&quot;320&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
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                            <attachment id="360483" name="Screen Shot 2022-02-14 at 2.21.29 PM.png" size="109407" author="m.maher@mongodb.com" created="Mon, 14 Feb 2022 22:22:54 +0000"/>
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