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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-58421] Always supply resume event to DSCSEnsureResumeTokenPresent</title>
                <link>https://jira.mongodb.org/browse/SERVER-58421</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;One consequence of the &lt;tt&gt;$match&lt;/tt&gt; pushdown work in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56871&quot; title=&quot;Allow $match and $project to swap with $_internalUpdateOnAddShard and $_internalEnsureResumeTokenPresent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56871&quot;&gt;&lt;del&gt;SERVER-56871&lt;/del&gt;&lt;/a&gt; is that resume tokens may be filtered out if the pipeline used to resume the stream is more restrictive than the original stream. We are OK with this, because resume tokens are not really intended to be applicable to streams other than the one that generated them. However, we found an edge case where &lt;tt&gt;startAfter&lt;/tt&gt; with an invalidation token could render the stream unresumable even with the same pipeline as the original stream, and addressed this in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57792&quot; title=&quot;Always supply invalidate event to DSCSEnsureResumeTokenPresent when starting after an invalidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57792&quot;&gt;&lt;del&gt;SERVER-57792&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Since it is not desirable to have a special-case for this scenario, and since the invalidate stage should ideally have minimal exposure to resume semantics, we should generalize the work done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57792&quot; title=&quot;Always supply invalidate event to DSCSEnsureResumeTokenPresent when starting after an invalidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57792&quot;&gt;&lt;del&gt;SERVER-57792&lt;/del&gt;&lt;/a&gt; to apply to all resume tokens.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1815038">SERVER-58421</key>
            <summary>Always supply resume event to DSCSEnsureResumeTokenPresent</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="rishab.joshi@mongodb.com">Rishab Joshi</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jul 2021 11:57:05 +0000</created>
                <updated>Mon, 12 Jul 2021 13:30:50 +0000</updated>
                            <resolved>Mon, 12 Jul 2021 13:30:50 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3927941" author="bernard.gorman" created="Mon, 12 Jul 2021 13:30:09 +0000"  >&lt;p&gt;After some consideration, we realised that this would produce inconsistent behaviour whereby a resume pipeline containing a &lt;tt&gt;$match&lt;/tt&gt; filter that excludes the resume event might or might not inhibit the resumption of the stream, depending on whether we can rewrite that filter into the oplog. We believe that the semantics will be much more clear if a resume token unambiguously cannot be used to resume a stream with a pipeline which excludes that event. The &lt;tt&gt;startAfter&lt;/tt&gt; case is genuinely distinct from the general case, since we are technically &lt;b&gt;starting a new stream&lt;/b&gt; on a collection which has been recreated, possibly with a different schema.&lt;/p&gt;</comment>
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