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    <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-78599] Prevent change collections from truncating inconsistent data</title>
                <link>https://jira.mongodb.org/browse/SERVER-78599</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Change collection truncation is performed on both primaries and secondaries. Data is only safe to truncate once the data is consistent up to the maximum timestamp to be truncated. In the case of the primary, this means not truncating after the no oplog hole point (all durable timestamp). On secondaries, it means not truncating past the lastApplied timestamp.&#160;&lt;/p&gt;

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

&lt;p&gt;The changes for this ticket should mirror the safeguards in place for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9dedbe3d61e2e60f22ea2089cb6bfccb12108016/src/mongo/db/change_stream_pre_images_truncate_manager.cpp#L517-L532&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pre-image truncation&lt;/a&gt; and be primary/secondary agnostic.&#160;&lt;/p&gt;

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

&lt;p&gt;&lt;b&gt;Old Description:&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77972&quot; title=&quot;Investigate that PreImagesTruncateManager on Secondaries takes PBWM lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77972&quot;&gt;&lt;del&gt;SERVER-77972&lt;/del&gt;&lt;/a&gt; describes a potential issue about holding the PBWM while initializing / truncating CollectionTruncateMarkers. We should investigate the implications of holding the lock for change stream change collection CollectionTruncateMarkers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2382381">SERVER-78599</key>
            <summary>Prevent change collections from truncating inconsistent data</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="13201">Fixed</resolution>
                                        <assignee username="yujin.kang@mongodb.com">Yujin Kang Park</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Jul 2023 08:41:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:19:18 +0000</updated>
                            <resolved>Fri, 1 Sep 2023 13:02:52 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5674111" author="xgen-internal-githook" created="Fri, 1 Sep 2023 10:17:05 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78599&quot; title=&quot;Prevent change collections from truncating inconsistent data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78599&quot;&gt;&lt;del&gt;SERVER-78599&lt;/del&gt;&lt;/a&gt; Prevent change collections from truncating documents after all_durable and lastApplied&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f9b4b7f75eb9f16897fd1f0b9dcb02d22cc4a078&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f9b4b7f75eb9f16897fd1f0b9dcb02d22cc4a078&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5628972" author="haley.connelly" created="Fri, 11 Aug 2023 15:25:17 +0000"  >&lt;p&gt;Marking as related to&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38341&quot; title=&quot;Remove Parallel Batch Writer Mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38341&quot;&gt;&lt;del&gt;SERVER-38341&lt;/del&gt;&lt;/a&gt; to track why the description changed.&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38341&quot; title=&quot;Remove Parallel Batch Writer Mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38341&quot;&gt;&lt;del&gt;SERVER-38341&lt;/del&gt;&lt;/a&gt; removed the concept of the PBWM lock altogether.&#160;&lt;/p&gt;</comment>
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            <issuekey id="2364562">SERVER-77972</issuekey>
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