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    <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-76288] While a split or merge is being committed change streams can return a hwm token that skips events on the recipient.</title>
                <link>https://jira.mongodb.org/browse/SERVER-76288</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;after the donor has reached the block timestamp it won&apos;t allow any more writes so normal resume tokens from an an actual change event can&apos;t be higher than block timestamp, but it can still generate high water mark tokens above the block time stamp. if a write happens on the recipient after the commit it could be skipped if the hwmt is higher than the cluster time of that write on the recipient.&lt;/p&gt;

&lt;p&gt;an easy solution is to disable this block &lt;a href=&quot;https://github.com/mongodb/mongo/blob/983d4ca5e0c50d644c64be42bd59df481dee0a57/src/mongo/db/exec/collection_scan.cpp#L256-L260&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/983d4ca5e0c50d644c64be42bd59df481dee0a57/src/mongo/db/exec/collection_scan.cpp#L256-L260&lt;/a&gt; to avoid returning tokens higher than the last write. This solution only works for replica sets and we will need to revisit this problem while working on sub-tenant splits and sharding support for serverless&lt;/p&gt;</description>
                <environment></environment>
        <key id="2318606">SERVER-76288</key>
            <summary>While a split or merge is being committed change streams can return a hwm token that skips events on the recipient.</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="mickey.winters@mongodb.com">Mickey Winters</assignee>
                                    <reporter username="mickey.winters@mongodb.com">Mickey Winters</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Apr 2023 14:58:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:49 +0000</updated>
                            <resolved>Fri, 28 Apr 2023 20:44:29 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5383608" author="xgen-internal-githook" created="Fri, 28 Apr 2023 02:56:34 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76288&quot; title=&quot;While a split or merge is being committed change streams can return a hwm token that skips events on the recipient.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76288&quot;&gt;&lt;del&gt;SERVER-76288&lt;/del&gt;&lt;/a&gt; disable high water mark tokens greater than the last operation for a tenant in serverless&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/49c7504d0f07819fcc7f94d522540290f2e83b26&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/49c7504d0f07819fcc7f94d522540290f2e83b26&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2318949">SERVER-76309</issuekey>
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