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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-76309] Re-enable support for high water mark tokens in serverless</title>
                <link>https://jira.mongodb.org/browse/SERVER-76309</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;during PM-2341 in &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; we disabled generation the mechanism for high water mark tokens in serverless since we could wind up returning hwmt with a time stamp greater than the block timestamp which could result in skipping events if a split or merge happens. this feature need to be reenabled somehow for change streams to work properly with sharding in serverless&lt;/p&gt;</description>
                <environment></environment>
        <key id="2318949">SERVER-76309</key>
            <summary>Re-enable support for high water mark tokens in serverless</summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mickey.winters@mongodb.com">Mickey Winters</reporter>
                        <labels>
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                <created>Wed, 19 Apr 2023 18:17:59 +0000</created>
                <updated>Mon, 24 Apr 2023 18:18:48 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5371518" author="mickey.winters" created="Mon, 24 Apr 2023 18:18:48 +0000"  >&lt;p&gt;the previous mechanism would send a new hwmt when another tenant does a write which is an issue for shard split. so this needs to be redone to look at the last timestamp in that tenant&apos;s change collection instead of the last event in the oplog. the last timestamp in the oplog is problematic because if there is a split a non migrating tenant can do writes during the critical section and a migrating tenant might wind up with a resume token with a time stamp after the split operation&apos;s blockTS&lt;/p&gt;</comment>
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