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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-74883] CollectionTruncateMarkers accounts for uninitialized wallTime</title>
                <link>https://jira.mongodb.org/browse/SERVER-74883</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a condition for CollectionTruncateMarkers that accounts for an uninitialised wallTime. We should investigate whether this is actually possible / should be taken into account.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2288907">SERVER-74883</key>
            <summary>CollectionTruncateMarkers accounts for uninitialized wallTime</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="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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Mar 2023 14:07:41 +0000</created>
                <updated>Sun, 29 Oct 2023 21:24:53 +0000</updated>
                            <resolved>Wed, 12 Apr 2023 15:52:17 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5341640" author="xgen-internal-githook" created="Wed, 12 Apr 2023 15:29:55 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74883&quot; title=&quot;CollectionTruncateMarkers accounts for uninitialized wallTime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74883&quot;&gt;&lt;del&gt;SERVER-74883&lt;/del&gt;&lt;/a&gt; Remove wallTime check from truncate markers&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9cbd2ec182148cc7cc45ca6351f8310065d1f6f1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9cbd2ec182148cc7cc45ca6351f8310065d1f6f1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5329889" author="JIRAUSER1264163" created="Thu, 6 Apr 2023 14:55:50 +0000"  >&lt;p&gt;Will wait until 7.0 is branched before merging this in to avoid excessive risk&lt;/p&gt;</comment>
                            <comment id="5302006" author="JIRAUSER1264163" created="Mon, 27 Mar 2023 10:26:30 +0000"  >&lt;p&gt;On second thought, this can&apos;t be hit even in the previous scenario. At most it would affect startup and the codepath used there takes the &quot;ts&quot; field if the &quot;wall&quot; field doesn&apos;t exist.&lt;/p&gt;

&lt;p&gt;That is, all entries now have a &quot;wall&quot; field set to the correct value. Will create a PR removing the check.&lt;/p&gt;</comment>
                            <comment id="5299214" author="JIRAUSER1264163" created="Fri, 24 Mar 2023 16:48:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42589&quot; title=&quot;Make the &amp;#39;wall&amp;#39; field in oplog_entry.idl a required field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42589&quot;&gt;&lt;del&gt;SERVER-42589&lt;/del&gt;&lt;/a&gt; made the &lt;tt&gt;wall&lt;/tt&gt; field required rather than optional in the oplog entries and as of 4.2 the wall time is always reported. The original OplogStones were written much much earlier than 4.2 at a time when the wall time was considered optional.&lt;/p&gt;

&lt;p&gt;It&apos;s quite possible this is safe to remove, but we might want to consider leaving a comment in CollectionTruncateMarkers explaining the legacy behaviour. I can imagine a scenario where a user upgrading in very rapid succession the cluster, even if it were extremely risky, could hit this. That would be the case with extremely old oplog entries being present that don&apos;t have a wall time and haven&apos;t yet been truncated.&lt;/p&gt;</comment>
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